CN102430568A

CN102430568A - Method for restoring acidized soil in hill forestland

Info

Publication number: CN102430568A
Application number: CN2011102767989A
Authority: CN
Inventors: 刘菊秀; 周国逸; 张德强; 李义勇; 李跃林
Original assignee: South China Botanical Garden of CAS
Current assignee: South China Botanical Garden of CAS
Priority date: 2011-09-16
Filing date: 2011-09-16
Publication date: 2012-05-02

Abstract

The invention discloses a method for restoring acidized soil in a hill forestland. The method comprises the following steps of: mixing municipal sewage sludge and quick lime according to the dry mass ratio of 12:1 to form a soil conditioner; and flatly spreading the soil conditioner on the slope top of the hill forestland. In the method, the soil conditioner is formed by mixing the quick lime and the municipal sewage sludge, so that the negative effects of high possibility of soil hardening and reduction in clay content after long-term application of lime are eliminated or the problem of difficulty in degradation of organic matters in the sludge after separate application of municipal sludge is solved. Lime stone makes the pH value of the soil easily raised; and due to the raise of the pH, the microbial activity of the soil is improved, and the degradation speed of the organic matters in the soil is increased. Due to the addition of the organic matters in the municipal sludge, the clay content of the soil can be improved, and the soil is prevented from hardening. The method is high in operability and low in cost; by the method, large-area acidized soil in the hill forestland in China can be restored, so that the agriculture and forestry production of the acidized soil in the hill forestland is quickly recovered; and an effective recovering path is provided for the restoration of the acidized soil in the hill forestland in China.

Description

The restorative procedure of forest land, a kind of hills acidified soil

Technical field:

The present invention relates to a kind of restorative procedure of acidified soil, be specifically related to the restorative procedure of forest land, a kind of hills acidified soil.

Background technology:

The fast development of China's industry causes the appearance of acid deposition problem thereupon.Research shows that China south has become the third-largest acid deposition district after American-European, the appearance of acid deposition problem; Cause the generation of soil acidification; Open-air and laboratory experiment shows that all in decades in the past, acid deposition has caused the large-area acidifying of Chinese soil.Acidified soil mainly is can not carry out agriculture and forestry production because soil pH value is low, soil nutrient is barren.If can improve soil pH value and increase soil nutrient content then can repair to acidified soil.In China acid rain area, a large amount of hills is extensively distributing.The undulating topography complicacy is special, and it is bigger to repair difficulty to the acidified soil of knob.Traditional method wastes time and energy such as liming, plant ash and barnyard manure, spends bigger.And, also can't resemble agricultural land soil liming and fowl and raise the such modifying agent of excreta and improve because the hills area is big.

Summary of the invention:

The purpose of this invention is to provide a kind of workable, cost is low, soil pH value is raise and nutrient content increases to reach the restorative procedure that acidified soil recovers forest land, the hills acidified soil of agricultural and forestry production purpose.

The restorative procedure of forest land, hills of the present invention acidified soil is characterized in that, may further comprise the steps:

Is 12: 1 mixed with city sewage and sludge and quick lime according to the dry mass ratio, forms soil conditioner, it is tiled in the top, slope in forest land, hills again.

The present invention is no more than 200 meters according to the relative altitude in forest land, hills, and the slow characteristics of the gradient, soil conditioner of the present invention is positioned over the hillside top concentrates and use, spread naturally through the face of land and interflow subsurface drainage; Lime stone raises soil pH value; Contain abundant organic matter and nutrient element in the city sewage and sludge, P especially increases the nutrient content of acidified soil; Thereby make the acidified soil reparation of forest land, hills, until carrying out agricultural and forestry production.

The present invention utilizes quick lime and city sewage and sludge to mix the back as soil conditioner, has overcome the counter productive that chronic administration lime makes soil compaction, clay content descend easily, and has used municipal sludge separately, the difficulty that the organic matter in the mud is difficult to decompose.Applying of lime stone risen soil pH value easily, and the rising of soil pH has improved the activity of edaphon, thereby also accelerated the decomposition of the soil organism.And the adding of the organic matter in the municipal sludge can improve the clay content of soil, avoids soil compaction.

This shows; The present invention is workable, cost is low; Can repair forest land, the large-area hills of China acidified soil; Thereby recover the agricultural and forestry production of forest land, hills acidified soil fast,, have important social and economic benefit for the reparation of forest land, the hills acidified soil of China provides an effective recovery approach.

Description of drawings:

Fig. 1 is that sloping top different distance soil pH dynamic change situation map is left in the forest land, hills of embodiment 1 after the different soils modifying agent is handled following 10 months;

Fig. 2 is that sloping top different distance content of soil exchangeable potassium and sodium dynamic change situation map are left in the forest land, hills of embodiment 1 after the different soils modifying agent is handled following 10 months;

Fig. 3 is that sloping top different distance content of soil exchangeable calcium and magnesium dynamic change situation map are left in the forest land, hills of embodiment 1 after the different soils modifying agent is handled following 10 months;

Fig. 4 is that sloping top different distance content of soil exchangeable aluminium and hydrogen dynamic change situation map are left in the forest land, hills of embodiment 1 after the different soils modifying agent is handled following 10 months.

The specific embodiment:

Following examples are to further specify of the present invention, rather than limitation of the present invention.

Embodiment 1:

In the national natural reserves, Dinghu Hill, select the maximum mixed coniferous broad leaved forest (topsoil pH value is 3.8-4.2) of distribution area to set up 12 areas and be 5 * 15m ²Sample prescription, 4 processing are set, each is handled 3 and repeats the acidified soil repairing test.Except that contrast; The soil acidification modifying agent of other 3 processing adopts city sewage and sludge (from Zhaoqing sewage treatment plant), lime+city sewage and sludge (is to mix at 1: 12 by the dry mass ratio with lime and city sewage and sludge), lime respectively; Use the soil acidification modifying agent through concentrating, utilize the natural diffusion couple acidified soil of rainwater leaching and rainwash to carry out orientation reparation at Po Ding (top of sample prescription).Experimental Establishment was accomplished in May, 2010, accomplished the dispensing of modifying agent June.Find that through sampling determination acidified soil was used modifying agent after 10 months, the detailed contrast situation of soil chemistry parameter is seen table 1.Can find out from table 1; The appearance ground soil 0-10cm layer pH value comparison of liming+city sewage and sludge is according to having improved 0.09～0.29 pH unit; The 10-20cm layer has improved 0.10～0.26 pH unit, and the 20-40cm layer has improved 0.09～0.19 pH unit, and soil organic matter content reaches 113% in the comparison of soil 0-10cm layer according to the highest amplification; The highest amplification of 10-20cm layer reaches 121%, and the highest amplification of 20-40cm layer reaches 80%.Sloping top different distance soil pH dynamic change situation is left in the forest land, hills after the different soils modifying agent is handled following 10 months; Content of soil exchangeable potassium and sodium dynamic change situation; Content of soil exchangeable calcium and magnesium dynamic change situation, content of soil exchangeable aluminium and hydrogen dynamic change situation are like Fig. 1,2, shown in 3 and 4.Compare with contrast; Applied the appearance ground of lime+city sewage and sludge; Soil pH value and base cation (K, Na, Ca, Mg) push up the end, slope from the slope amplification reduces gradually, and the very significantly trend of increase appears in exchangeability Al, and applying along with soil conditioner (lime+city domestic sewage) is described; Soil aciditiy reduces gradually, and soil nutrient increases gradually.Show that more than this modifying agent of co-administered city sewage and sludge+lime can well be repaired forest land, acidifying hills.

Forest land, table 1. hills soil chemistry parameter after the different soils modifying agent is handled following 10 months changes

Claims

1. the restorative procedure of forest land, hills acidified soil is characterized in that, may further comprise the steps: is 12: 1 mixed with city sewage and sludge and quick lime according to the dry mass ratio, forms soil conditioner, it is tiled in the top, slope in forest land, hills again.