AU2021100853A4 - A Method for Promoting the Regeneration of Constructive Species- Salicaceae Mirb. Population with Clonality and R-strategy Characteristics in Degraded Desert Riparian Forests - Google Patents

Abstract

The invention relates to a technical method for vegetation restoration and reconstruction of degraded ecosystem of desert riparian forest in arid regions, in particular to a method and measures for the regeneration of degraded constructive species- Salicaceae Mirb. population with clonality and R-strategy characteristics in desert riparian forests of arid regions. The technical method is based on the principle of economical, technically feasible and easy to operate. Taking account the fact that the relatively concentrated rainfall events in the hyper arid areas of their habitat can accumulate water through runoff generation from excess rain and locally improve the renewal habitat of the target population to manually adjust the topography of the pre-restored target population forest according to the timing and regularity of the reproduction and renewal of the target Salicaceae Mirb. population. Specifically, artificial water catchment and stagnant water areas are created, and "wet islands" among forests are built with the help of rainfall. During the seed rain of target population, water supplement of above areas is achieved by river flood or ecological water conveyance in good time and further "seed trap" and "seed enrichment pool" are formed to strengthen the "wet island" effect of forest. Meanwhile, with the measures of promoting root tillers, the soil moisture condition and population regeneration habitat in the upper layer of forest are improved, and the regeneration probability of Salicaceae population in degraded riparian forest is increased to facilitate population regeneration.

Description

A Method for Promoting the Regeneration of Constructive Species- Salicaceae

Mirb. Population with Clonality and R-strategy Characteristics in Degraded

Desert Riparian Forests

TECHNICAL FIELD

[01] The invention relates to a technical method for vegetation restoration and reconstruction of degraded ecosystem of desert riparian forest in arid regions, and particularly describes a method and measures for the regeneration of degraded constructive species- Salicaceae Mirb. population with clonality and R-strategy characteristics in desert riparian forests of hyper-arid areas.

BACKGROUND

[02] Accounted for 40% of the world's land area, arid and semi-arid regions have such a fragile and easily disturbed ecosystem with low vegetation coverage, created by low rainfall, high evaporation and weakly developed soil. The desert riparian forest ecosystem with Salicaceae plants as the constructive species is a unique and important part of the desert ecosystem in arid and semi-arid areas, which provides the vast majority of primary productivity to the desert ecosystem in this region. Due to the characteristics of easy disturbance, instability and high vulnerability, coupled with unreasonable water and soil exploitation by human beings, the environmental and ecological problems of desert riparian forest ecosystem in this region have become increasingly prominent (such as vegetation degradation, soil erosion and desertification aggravation). The arid and semi-arid areas in northwest China account for a quarter of China's land area. The desert riparian forest ecosystems (such as the Tarim River and Heihe River) with Populus euphratica as the dominant species have developed in the region along the inland river basins, which provides an important habitat for maintaining high biodiversity of the region. Compared with other ecosystems, these desert riparian forest ecosystems in arid regions are facing more serious threats under the disturbance of global climate change and increasing human activities. As a concrete research example of this method, the lower reaches of the Tarim River in China are the most typical areas. The desert riparian forest with Populus euphratica as the main species in the Tarim River Basin of Xinjiang is the world's largest natural Populus euphratica forest distribution area and natural population gene pool, which plays an important role in maintaining the production, living and ecological security in the basin, resisting the wind and sand hazards, and ensuring the sustainable utilization of environment and resources and the stable development of society in the whole region. However, in the past 50 years, the ecological environment of desert riparian forests in the middle and lower reaches of the Tarim River has been increasingly degraded due to the intensive human economic and social activities centred on the development and utilization of water resources, especially in the lower reaches of the Tarim River, where the river channel is cut off, the lower reaches are dry and the groundwater level has dropped significantly. The desert vegetation with Populus euphraticaforest as the main part has declined completely, resulting in intensified desertification process and wind erosion as well as seriously damaged biodiversity. Besides, disastrous weather, such as floating dust, sandstorms and so on, has severely affected the normal, stable and sustainable development of the social economy in the region. Populus euphratica, as the main constructive species in desert riparian forest ecosystem of this region, is suffering serious population degradation and obvious reverse succession under the influence of river channel cut-off and groundwater level continuous decline. One of the important factors causing the decline of Populus euphratica population is the insufficient population renewal. The original breeding conditions of Populus euphratica are lost due to the changes of time and space during hydrological process, resulting in significant aging and serious degradation of the entire population structure. Since 2000, the ecological water conveyance and comprehensive river basin rehabilitation projects implemented with the strong investment of the Chinese government and the active advocacy of local governments have played an important role in curbing environmental degradation in this area. However, a single measure of water conveyance along linear rivers has significant limitations in time and space. Ecological water conveyance has not fundamentally changed the regeneration and breeding conditions of Populus euphratica populations along the river. Although the serious degradation trend of Populus euphratica populations near rivers has been restrained to a certain extent, showing a rejuvenation trend, the renewal of the entire population is still not optimistic. Populus euphratica population is still dominated by adult or elderly plants over 40 years, with few young forests, indicating and the entire population is seriously aging. It is difficult for Populus euphratica to achieve population renewal, thereby realizing the restoration and sustainable succession of the entire community simply by relying on ecological water conveyance along the river. Therefore, there is an urgent need for technical methods to promote population renewal of degraded Populus euphraticawith the help of appropriate human measures.

[03] Salicaceae Mirb., which lives in desert riparian forest of arid area, has formed a double reproduction strategy of sexual reproduction and asexual reproduction in the long-term adaptation and evolution process of adversity. Because of the harsh and unstable habitat conditions in arid areas, Populus euphratica is the R strategist under R selection in sexual reproduction, which makes the seeds of these Salicaceae plants have the characteristics of large quantity, small grains, quick inactivation and low survival rate. The seed germination of Salicaceae constructive species in these desert riparian forests requires shallow stagnant water and moist soil similar to the floodplain environment on the surface during seed rain. However, the earth surface hydrological process changed by the disturbance of human activities often lacks the flood overflow in summer. As a result, the seed germination conditions of these constructive species are often difficult to meet in the current arid zone desert riparian forest ecosystem, and the method of using sexual reproduction to regenerate young forests is lacking. These species living in arid areas can also reproduce asexually by tillering adventitious buds from horizontal roots distributed in the upper soil, and then developing into young plants, so as to realize the regeneration of population when sexual reproduction is not satisfied. However, with the continuous degradation of desert riparian forest ecosystem in arid areas and the continuous decline of groundwater level, the plant roots gradually develop and grow into deep layers, and the continuous decrease of water content in the upper soil (0-100cm) leads to the inactivation of a large number of horizontal roots in the soil or the stopping of root tillers, which increases the difficulty of asexual reproduction of Salicaceaespecies in the degraded desert riparian forest ecosystem. Taking Tarim River as an example, the population regeneration of Populus euphratica in the lower reaches is weak, the sexual reproduction of Populus euphratica by seeds is basically impossible, and the young seedlings produced by asexual root tillering reproduction are also less and less.

[04] According to the characteristics analysis of meteorological data in arid areas, field investigation and experiments, it is found that although these areas are located in arid areas with annual average rainfall mostly less than 100 mm, the annual rainfall is relatively concentrated, and nearly 80 % of the rainfall in a year is often concentrated in one or two rainfall events. Under the action of infiltration-excess runoff, stagnant water is often formed in low-lying desert areas, and a "wet island" with moist soil is formed in the stagnant water area. In some low-lying stagnant water areas near desert riparian forests, the surface layer of water-rich soil can often be kept moist for a week under the effect of tree shade, and the soil below 30-50cm of the surface can remain moist for longer. Although such an area is far away from the river, it still can capture and gather many seeds during the seed rain of Salicaceae to facilitate seed germination. Some seedlings and root tillers can be seen in such areas. However, due to the effects of differential weathering and soil consolidation and sand control of natural vegetation in the desert riparian forests, most of the existing desert riparian forests are located in relatively high terrain, while water accumulation areas are almost located in barren land formed by long-term wind erosion. These areas are far away from the population to be restored, basically without vegetation coverage, and the soil is hard, with rapid evaporation of stagnant water, and cannot provide a habitat for seed germination and root tillering. By artificially adjusting the topography of the degraded Salicaceae community in the desert riparian forests, such as the creation of "wet islands" in the forests through artificial low-lying water catchment and stagnant water areas, the local reproduction and regeneration conditions cam be improved and the germination and root tiller chances of these degraded populations increased, thereby the regeneration of degraded Populus euphraticapopulations is promoted.

[05] According to the above-mentioned actual degradation of desert riparian forest ecosystem in the arid area, and taking into account the breeding characteristics and rules such as seed germination time and root tiller of these constructive species, as well as the meteorological and hydrological characteristics in the study area, the open space of Populus euphratica population forest is artificially adjusted with the water catchment and stagnant water areas artificially created. In the past ten million years, these constructive species have realized the reproductive characteristics that their seed falling time is basically the same as the flood period of the river. Then, combined with the ecological water delivery, people can make full use of the reproductive characteristics and select the appropriate time to use the water from the river or water diversion to supplement water in the artificial catchment area during the flood period, so as to create and strengthen the "wet island" effect in the forest. In addition, the "seed trap" and "seed enrichment pool" can be formed through the capture of surface ponding areas during Populus euphratica seed rain, which promotes the seed germination of these degenerated Salicaceaeconstructive species. Furthermore, the "wet island" effect in the forest can promote the activation of the surface roots and the occurrence of root tillers of the surrounding individuals towards the catchment area, which further improves the habitat for asexual reproduction of surrounding Populus euphratica and promotes the occurrence of root tiller reproduction, thereby the population renewal is promoted, and finally the degraded desert riparian forest ecosystem is effectively restored.

SUMMARY

[06] The purpose of the present invention is to artificially build water catchment and stagnant water areas by using the natural terrain differences between desert riparian forests and following the breeding and reproduction law of local Salicaceae constructive groups, as well as the temporal and spatial characteristics of earth surface hydrological distribution and meteorological conditions in river basins of the region. Then sexual reproduction and asexual reproduction habitats for degraded Salicaceae constructive groups are provided by creating "wet islands", "seed traps" and "seed enrichment pools" in forests, thus improving the probability of population reproduction and renewal, promoting the regeneration of degraded populations and perfecting the age structure of degraded Salicaceaecommunities in the existing desert riparian forest. Therefore, the invention can realize the regeneration, conservation and restoration of dominant species in the hyper-arid desert riparian forest ecosystem without large-scale flooding.

[07] The invention is realized by the implementation of the following specific technical methods.

[08] Aimed at the arid area desert riparian forest lacking large-area surface flooding conditions, with rainfall less than 100 mm but highly concentrated in spring and summer, the invention provides a technical method for promoting the reproductive and renewal of the Salicaceae constructive species with clonality and R strategy characteristics in degraded desert riparian forest.

[09] The main scheme of this technology is as follows.

[010] 1. This method is based on the following two points of understanding. On one hand, the habitat for the germination and root tillers of the Salicaceaeconstructive species in the desert riparian forest in arid areas requires surface water and moist surface soil. On the other hand, there is such a natural law that the annual rainfall in the restoration area is low, but the rainfall events are highly concentrated and can form accumulated water through infiltration-excess runoff. Furthermore, by artificially adjusting the depressions between the forests, water catchment and stagnant water areas with honeycomb-like distribution are built to create conditions for the infiltration excess runoff of summer rainfall, and further create "wet islands" between forests to improve the soil moisture conditions in the upper layer of the forest, thereby providing a habitat for the germination and root tiller reproduction of the degraded Salicaceae constructive populations. The artificial water catchment and stagnant water areas between forests can be constructed according to the actual topography, which is irregular, nearly circular or oval. The spatial distribution is in a honeycomb shape to increase the water catchment effect. It is better not to be far away from the population to be restored and is best to be in the forest, under the shade of the tree, or near the surrounding area not exceeding 30m. The use of shading can increase the water accumulation time, reduce ineffective evaporation and increase infiltration. At the same time, the infiltration of stagnant water is beneficial to increase the upper soil moisture to form a "wet island", which is used for the restoration of the horizontal roots of Salicaceaespecies. The catchment area is preferably 30-100m2 , with terrain differences of 50-100cm to the surrounding area.

[011] 2. After the forest honeycomb artificial water catchment and stagnant water areas are built, if conditions permit, river floods in the basin can be used to divert water from the river or extract shallow groundwater near the river through artificial water diversion or pumping. During the peak period of the seed rain for these constructive seedlings each year, targeted water replenishment is carried out on the artificial water catchment areas in the forest. After water replenishment, depending on the area of the water catchment area and the water falling head, the water area should be less than 100m 2, and the depth of water should be 10-30cm. Keep the surface water or surface soil saturated with water for 1-2 days, so as to strengthen the "wet island" effect in the forest and further increase the soil moisture content in the upper layer of the forest. And then artificially create "seed traps" and "seed enrichment pools" during the peak period of seed rain to create suitable habitats for the regeneration and reproduction of the Salicaceaespecies populations in the degraded desert riparian forest, thereby promoting the regeneration of degraded populations.

[012] 3. For artificial catchment areas with unsatisfactory planting and germination, after two to three years of construction and the formation of the "wet island" effect in the forest, select the adult plants around the artificial catchment area to excavate 1-2 root cutting ditches on the side facing the catchment area, with length of 2-3m, width of 30-40cm and depth of 80-100cm. During the excavation process, cutting off the horizontal roots with a diameter of 1-3cm in the nearby adult Salicaceaespecies and applying rooting powder solution or indoleacetic acid solution to the fractures and then covering roots with soil to 10-20cm above the cut roots to promote and stimulate root tillers. Root cutting should be carried out before natural vegetation germination in early spring.

[013] The invention has the following advantages and remarkable effects.

[014] Based on the reproduction law of the degraded Populus euphratica population in the desert riparian forest ecosystem in the arid area of Northwest China, the present invention, while taking into account regional meteorological, hydrological, and geomorphic conditions, proposes the above-mentioned technology to promote the reproduction and renewal of the Salicaceaeconstructive species in the degraded desert riparian forest. The invention is suitable for the site where there is no large-area surface flooding conditions, with large groundwater level (>4m), low water content (average <3%) in the upper soil (0-1m) has, and rainfall less than 100mm but with high intensive rainfall events concentrated in summer, indicating weakness in natural regeneration of the established species population.

[015] 1. The present invention takes advantage of the population reproduction regular characteristics of Salicaceaeconstructive species with clonality and R strategy in the arid area desert riparian forest, and takes into account the meteorological, hydrological and geomorphological characteristics of the study area. Through the disturbance of man-made measures, water catchment and stagnant water areas are built in the forests of the planned restoration populations according to the terrain to make full use of the rainfall of highly concentrated precipitation events and the accumulated water of infiltration-excess runoff in arid areas so as to create "wet islands" among Populus euphratica populations, thereby improving the renewal habitat of Populus euphratica population. With the help of river floods and shallow groundwater, select the appropriate time to replenish water in the artificial water catchment area, create stagnant water, strengthen the "wet island" effect in the forest, and create "seed traps" and "seed enrichment pools" in good time to promote the reproductive renewal of these Salicaceae species. Compared with the measures of artificial replanting to restore the population, this method is more operable, lower in cost, and in accord with the growth law of the population to be restored.

[016] 2. Compared with relying solely on Salicaceae species themselves for planting and horizontal root tiller reproduction in the upper soil, the technology of the present invention rationally utilizes topography, landforms, meteorological and hydrological conditions, and build "wet islands", "seed traps" and "seed enrichment pools" among forests through man-made disturbance so as to improve the population regeneration habitat. Under the conditions of lacking flooding and overflow, the invention can increase the natural reproduction and renewal probability of the Salicaceaeconstructive species in the degraded desert riparian forest.

[017] 3. This method can more efficiently use limited water resources, purposefully expand the water-receiving area and the restoration area and enhance the restoration performance. Further, it can effectively use precious and scarce atmospheric precipitation to realize the improvement of the restoration habitat and expand the ecological significance of rainfall.

DESCRIPTION OF THE INVENTION

[018] Embodiment 1

[019] Select the Populus euphratica population at a distance of 100m from the river course in the lower reaches of the Tarim River in China, besides, the groundwater depth is about 4m. The topography of the two Populus euphraticapopulation forests is lightly renovated according to the topography, and 4-5 water catchment and stagnant water areas are artificially built with different areas of 30-50m2 . After the completion of the stagnant water areas and in July of that year, the low-lying stagnant water and river water are be extracted to supplement the water catchment and stagnant water areas.

[020] Application steps:

[021] 0)Improvement and construction of water catchment areas

[022] In late May of spring, after the end of the windy season and before the rainy season every year, two Populus euphraticapopulations about 100m away from the river channel in the lower reaches of Tarim River are selected. Both Populus euphratica populations shows the characteristics of regeneration fatigue. The age structure of the population is mainly over-mature forest, and the young forest is basically absent. In addition, the overflow of river water could not be realized in the two areas under natural conditions. In Populus euphraticapopulation forest, the topography is adjusted slightly according to the topography, and 4 and 5 catchment and stagnant water areas of 30 m2 are created respectively. The shape of the catchment community is irregular to nearly oval, the terrain differences between the low-lying area and the periphery is 50 cm, and water areas are honeycomb-shaped. After the completion, the water stored in the low-lying area of the river channel is extracted to replenish the water areas, forming water with a depth of 10-20cm and lasting for one day, so that a "wet island" in the forest is formed as soon as possible and the upper soil moisture conditions of the forest catchment area is improved.

[023] @ Replenishment irrigation of catchment area in summer

[024] For the artificial water catchment and stagnant water areas in the forest that have been built and have been refilled once, the ecological water transport in the summer river is used to replenish the stagnant water areas again during the peak of Populus euphratica seed rain in mid-July to make them filled with water of 10-30cm and keep the surface water for 1 day. On the one hand, it can realize the water replenishment to the upper soil of the catchment area, strengthen the "wet island" effect among the forests, and promote the root tillers of the surrounding Populus euphratica. On the other hand, through the surface water and the saturated water content of the surface soil after the accumulation of water, the Populus euphratica seeds can be captured and enriched, and the conditions for the germination of the Populus euphratica seeds are created and the population of Populus euphraticais promoted.

[025] Embodiment 2

[026] Select the Populus euphraticapopulation at a distance of 2000-300m from the river course in the lower reaches of the Tarim River in China, besides, the groundwater depth is about 5-6m. The topography of the two Populus euphratica population forests is lightly renovated according to the topography, and 5-6 water catchment and stagnant water areas are artificially built with different areas of 30 100m 2. After the completion of the stagnant water areas and in July of that year and next year, the river water and well water are be extracted to supplement the water catchment and stagnant water areas twice.

[027] Application steps:

[028] 0)Improvement and construction of water catchment areas

[029] In late May of spring, after the end of the windy season and before the rainy season every year, two Populus euphraticapopulations about 200-300m away from the river channel in the lower reaches of Tarim River are selected. Both Populus euphratica populations shows the characteristics of regeneration fatigue. The age structure of the population is mainly over-mature forest, and the young forest is basically absent. In addition, the overflow of river water could not be realized in the two areas under natural conditions. In Populus euphraticapopulation forest, the topography is adjusted slightly according to the topography, and 5 and 6 catchment and stagnant water areas of 30 100m 2 are created respectively. The shape of the catchment community is irregular to nearly oval, the terrain differences between the low-lying area and the periphery is 50 100cm, and water areas are honeycomb-shaped.

[030] @ Replenishment irrigation of catchment area in summer

[031] For the artificial water catchment and stagnant water areas in the forest that have been built, the underground water of river water and ecologic well river is used to replenish the stagnant water areas twice during the peak of Populus euphratica seed rain in mid-July and next mid-July to make them filled with water of 10-30cm, keep the surface water for 1 day and maintain the surface soil saturated with water for 1-2 days. On the one hand, it can realize the water replenishment to the upper soil of the catchment area, strengthen the "wet island" effect among the forests, and promote the root tillers of the surrounding Populus euphratica. On the other hand, the "seed traps" and "seed enrichment pools" are formed by capturing and enriching the seeds of Populus euphratica through the saturated water state of the surface soil after the accumulation of water on the surface and the surface soil, which creates conditions and habitats for the germination of Populus euphratica seeds and further realizes purpose of increasing the renewal probability of Populus euphraticapopulation.

[032] Embodiment 3

[033] This embodiment is implemented on the basis of Embodiments 1 and 2. The implementation area is selected from the Populus euphratica population, 100-300m away from the river, with aging population structure and rare young forests. On the basis of Embodiments 1 and 2, in the early spring two years after the completion of the catchment areas, select catchment areas that have not seen seedlings and germination. The roots of the surrounding Populus euphratica facing the "wet island" of the water catchment area are cut to stimulate the root tiller.

[034] Application steps:

[035] 0)Improvement and construction of water catchment areas

[036] The same as Embodiments 1 and 2.

[037] @ Replenishment irrigation of catchment area in summer

[038] The same as Embodiments 1 and 2.

[039] @ Root cutting and tillering

[040] Select the artificial water catchment areas in Embodiments 1 and 2 that are not ideal for planting and germination. 2 years after the construction of the "wet islands" in the forest, digging 1-2 root cutting ditches on the side facing the stagnant water area in early spring, mid to late March. Specifically, the root cutting ditch length is 2-3m, width is 30-40cm and depth is 80-100cm. During the excavation process, cutting off the horizontal roots with a diameter of 1-3cm in the nearby adult Salicaceae species and applying rooting powder solution or indoleacetic acid solution to the fractures to stimulate root tillers. And then covering roots with soil to 10-20cm above the cut roots to prevent broken roots from draining quickly. In this way, the invention can realize the promotion and stimulation of root tillers.

[041] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.

[042] The present invention and the described embodiments specifically include the best method known to the applicant of performing the invention. The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable

Claims (4)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. The site where the degraded desert riparian forest is located lacks large-scale surface

overflow conditions with large buried depth of groundwater level (> 4m), lower water

content (average < 3%) in topsoil (0-1m) and rainfall less than 100mm. However, heavy

rainfall events are highly concentrated in spring and summer. The technical method for

reproduction and regeneration of Salicaceae constructive population with clonality and

R-strategy in such a degraded desert riparian forest with weak natural population

regeneration, characterized by comprising the main steps below.

a. Make fine adjustments to the terrain according to the actual terrain.

Artificially constructing low-lying water catchment and stagnant water areas of 30

100m 2 with terrain differences of 50-100cm between the forests to be restored and the

surrounding areas within 30m, which are randomly distributed in a honeycomb pattern.

Then utilizing the water catchment and stagnant water areas in the forest to fully

accumulate stagnant water caused by the infiltration-excess runoff occurring in the

highly concentrated rainfall event in summer, thereby building the "wet island" in the

forest to improve the soil moisture conditions and the population regeneration habitat.

b. Under the condition of unable to achieve large-scale surface flooding and overflow,

the short-term flooding of watercourse and shallow groundwater near the watercourse

are utilized. During the peak period of the seed rain of Salicaceae species in summer,

the built water catchment and stagnant water areas shall be supplemented with purpose

and pertinence to form stagnant water with different areas (30-100m 2) and depth of 10

cm. Then maintaining them for 1-2 days to strengthen the "wet island" effect of

catchment areas. And during the seed rain, the surface water and the subsequent water- saturated soil are used to create "seed traps" and "seed enrichment pools" in a timely manner to improve the local population regeneration habitat.

c. 2-3 years after the construction of the water catchment and stagnant water areas in

the forest, that is after the formation of the "wet island" in the forest, selecting the area

with unsatisfactory planting and germination, and digging 1-2 root cutting ditches on

the side facing the stagnant water area. During the excavation process, cutting off the

horizontal roots with a diameter of 1-3cm in the nearby adult Salicaceae species and

applying rooting powder solution or indoleacetic acid solution to the fractures and then

covering roots with soil to 10-20cm above the cut roots to promote and stimulate root

tillers. Root cutting should be carried out before natural vegetation germination in early

spring.

2. The technical method for reproduction and regeneration of Salicaceae constructive

population as stated in Claim 1, characterized in that the terrain should be made fine

adjustments based on the actual terrain. Specifically, low-lying water catchment and

stagnant water areas of 30-1OOm 2 with terrain differences of 50-100cm are constructed

between the Salicaceae constructive forests and the surrounding areas within 30m,

which are randomly distributed in a honeycomb pattern, so that the stagnant water

caused by the infiltration-excess runoff during the highly concentrated rainfall event in

summer can be fully accumulated.

3. The technical method for reproduction and regeneration of Salicaceae constructive

population as stated in Claim 1, characterized in that after the water catchment

community is built, river water and groundwater are used to make targeted water

replenishment for the water collection community at the peak of seed rain of the species to be restored, and stagnant water with different areas and depths of 10-30cm is formed and lasts for 1-2 days, so as to strengthen the "wet island" effect among forests, create

"seed traps" and "seed enrichment pools" to improve the regeneration habitat of local

populations.

4. The technical method for reproduction and regeneration of Salicaceae constructive

population as stated in Claim 1, characterized in that before the natural vegetation

germinates in early spring, the adult individuals to be restored around the catchment

area with unsatisfactory seed germination are selected, 1-2 root cutting ditches are

excavated on the side facing the catchment area, the horizontal roots of the individuals

to be restored with a diameter of 1-3cm are cut off, and the fractures are coated with

rooting powder solution or indoleacetic acid solution, and then covered with soil to 10

cm above the roots.