CN108344707A - A method of measuring grassland evapotranspiration using herbicide - Google Patents
A method of measuring grassland evapotranspiration using herbicide Download PDFInfo
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- CN108344707A CN108344707A CN201810067902.5A CN201810067902A CN108344707A CN 108344707 A CN108344707 A CN 108344707A CN 201810067902 A CN201810067902 A CN 201810067902A CN 108344707 A CN108344707 A CN 108344707A
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- 239000004009 herbicide Substances 0.000 title claims abstract description 36
- 230000002363 herbicidal effect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000002474 experimental method Methods 0.000 claims abstract description 20
- 239000012496 blank sample Substances 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000004907 flux Effects 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims description 36
- 230000005068 transpiration Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- ZEKANFGSDXODPD-UHFFFAOYSA-N glyphosate-isopropylammonium Chemical group CC(C)N.OC(=O)CNCP(O)(O)=O ZEKANFGSDXODPD-UHFFFAOYSA-N 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 8
- 238000001704 evaporation Methods 0.000 abstract description 7
- 230000008020 evaporation Effects 0.000 abstract description 7
- 230000000630 rising effect Effects 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 18
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 6
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- 238000012545 processing Methods 0.000 description 3
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- 230000007613 environmental effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229940063650 terramycin Drugs 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009333 weeding Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 241000234653 Cyperus Species 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
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- 235000005822 corn Nutrition 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000012623 in vivo measurement Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 210000000216 zygoma Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Cultivation Of Plants (AREA)
Abstract
A method of grassland evapotranspiration being measured using herbicide, is included the following steps：Selected sample, connect base is set on the periphery of each sample prescription, sprays herbicide in testing sample prescription, to each cube assimilation box location parameter, calculates the water flux of each cube assimilation box, respectively obtain the evapotranspiration of experiment sample prescription and blank sample prescription.Comparison sample prescription of the present invention relative to grass-cutting treatment, the test sample of herbicide treatment can obtain the ecosystem closer to control, that is blank sample prescription, original covering situation and ground table status, enabling more acurrate measurement region divides the evaporation that the ecosystem evapotranspires to be formed with rising.
Description
Technical field：
The present invention relates to a kind of methods measuring grassland evapotranspiration using herbicide.
Background technology：
Moisture is north of China arid, the important limiting factor of the influence of Semi-arid Grassland region productivity and regional environment.
It is a core component during global energy and water balance and ecosystem exchange of moisture to evapotranspire.Many ecosystems
Process, such as plant photosynthesis, soil moisture content, biochemical cycles and energy budget group Chengdu are influenced by evapotranspiration.It is raw
Evapotranspiration is horizontal between state system and dynamic process is between different vegetation types, different weather and climate conditions and different soils property
Variation is very big.The transformation of the utilization, way to manage that are happened at north of China meadow be likely to change local water household and
Water balance.Therefore, steppe vegetation covering, soil form and corresponding environment are micro- caused by studying different mankind's management and utilization modes
How the variation of weather influences ecosystem evapotranspiration, and inquiring into Human impact behavior will be how by the change to Grassland Evapotranspiration
It influences the original ecosystem function in meadow and terrestrial ecosystems water balance is of great significance.
It is directed to the observation of evapotranspiration at present, it is more by vortex correlation system and lysimeter.Vortex correlation system can be grown
Time automatically determines the intensity of evapotranspiring of the record ecosystem, but since its measurement foot-print areas is larger, it is difficult to it accurately distinguishes same
The Water Flux difference of one place or immediate area.In addition, ecosystem evapotranspiration is by earth's surface E (soil evaporation) and canopy T
(plant transpiration) collectively forms, and current research does not often split two sources of evapotranspiration accurately, thus is difficult to depth
Enter to understand the ecosystem evapotranspire variation the reason of and detailed regulatory mechanism.
Invention content：
The purpose of the present invention provides a kind of careless using herbicide measurement aiming at disadvantages mentioned above of the existing technology
The method of former evapotranspiration can distinguish Water Flux difference, and two sources of evapotranspiration can accurately be torn open
Point, solve problems of the prior art.
Used technical solution is the present invention to solve above-mentioned technical problem：
A method of grassland evapotranspiration being measured using herbicide, is included the following steps：
S1, selected sample, sample prescription is set in sample ground, and the sample prescription includes experiment sample prescription and blank sample prescription；
S2, connect base is set on the periphery of each sample prescription, the connect base bottom is inserted into soil, and ground is stretched out in top
Face is arranged；
S3, herbicide is sprayed in testing sample prescription, the plant in sample prescription to be tested all kills, then respectively in experiment sample prescription
With installation cube assimilation box, the top of the bottom and connect base of the cube assimilation box in the connect base of blank sample prescription
It is equipped with；
S4, each cube assimilation box is proceeded as follows：Connection one is for measuring steam outside cube assimilation box
The infrared gas analyser of concentration changes with time simultaneously measures, and a temperature detector and pressure are equipped in cube assimilation box
Force detector；Measure the volume of cube assimilation box and the floor area of cube assimilation Bin covering；
S5, the water flux for calculating each cube assimilation box, respectively obtain the evapotranspiration of experiment sample prescription and blank sample prescription.
Preferably, the herbicide is glyphosate-isopropylammonium.
Preferably, vapour concentration in the infrared gas analyser constant duration METHOD FOR CONTINUOUS DETERMINATION record case, it is dense with steam
Degree is ordinate, and the time is abscissa, takes at least preceding ten data of vapour concentration to carry out linear fit, works as R2>When 0.98
Receive fitting result, it is dc/dt to take slope, if R2≤ 0.98, then remove first vapour concentration data, increase immediately behind
One vapour concentration data, carries out linear fit again, and so on until obtaining satisfactory R2, and it is dc/ to take slope
dt。
Preferably, the water flux is denoted as Fh, unit mmol.m-2.S-1： Fh=1000VPav/RS(Tav+273)×dc/
dt；
Wherein：The volume of cube assimilation box is denoted as V, unit m3, temperature detector detection infrared gas analyser measurement
Period obtains mean temperature Tav, unit DEG C, cube assimilation Bin covering floor area be denoted as S, unit m2, pressure detector inspection
It surveys during infrared gas analyser measures and obtains mean temperature Pav, unit kPa, dc/dt indicate that vapour concentration changes over time speed
Rate, R are ideal gas constant, take R=8.314J.mol-1.K-1。
Preferably, the corresponding F of the experiment sample prescriptionhIt is denoted as E, the corresponding F of the blank sample prescriptionhIt is denoted as ET, the transpiration of plant
Action intensity is denoted as T, T=ET-E.
Preferably, the vapour concentration immediately begins to measure after the capping of cube assimilation box, time interval 1S, inspection
It is no less than 20S the total times of survey, is no more than 40S.
Preferably, a soil moisture probe is set near the cube assimilation box in soil, and is measured using soil moisture instrument
Soil moisture content is equipped with a relative humidity detector in cube assimilation box；The soil moisture probe is inserted into the depth of soil
Degree is 5cm；The soil moisture instrument is TDR100.
Preferably, several fans are additionally provided in cube assimilation box.
Preferably, the sample prescription further includes comparison sample prescription, and the comparison sample prescription cradles the side of surface vegetation using flush with ground
Formula is handled, and the plant part of ground eruption is wiped out before each measure.
Preferably, in S3, two days are waited at least for and state of naturally shading when plant being maintained to survive after spraying herbicide,
Then it is measured again.
Compared with prior art, it is an advantage of the invention that：Relative to the comparison sample prescription of grass-cutting treatment, the examination of herbicide treatment
Test the available ecosystem closer to control of sample prescription, i.e. blank sample prescription, original covering situation and ground table status, enabling
More acurrate measurement region divides the evaporation that the ecosystem evapotranspires to be formed with rising.The moisture transpiration of experimental hypothesis plant contribution is due to processing
Experiment sample prescription implants killed and seriously inhibited to completely eliminating by herbicide entirely, with the experiment sample prescription of herbicide treatment
Interior exchange of moisture is almost contributed by terramycin dregs entirely, and the exchange of moisture of measurement approximate can represent control Central Plains and carry out the ecosystem
Blank sample prescription evaporation issues.And the rising part of ecosystem plant contribution can then be evapotranspired by what is measured in blank sample prescription
The evapotranspiration difference that the experiment sample prescription of (evapotranspiration) and herbicide treatment measures obtains.The comparison result of three kinds of processing modes is aobvious
Show that herbicide treatment covers edaphic condition, vegetation and the change of original environmental factors such as ground table status is smaller, is more suitable for steaming
Scattered effect is split.
Specific implementation mode：
In order to clarify the technical characteristics of the invention, below by specific implementation mode, the present invention is explained in detail
It states.
A method of grassland evapotranspiration being measured using herbicide, is included the following steps：
S1, selected sample, sample prescription is set in sample ground, and the sample prescription includes experiment sample prescription and blank sample prescription；
S2, connect base is set on the periphery of each sample prescription, the connect base bottom is inserted into soil, and ground is stretched out in top
Face is arranged；
S3, herbicide is sprayed in testing sample prescription, the plant in sample prescription to be tested all kills, then respectively in experiment sample prescription
With installation cube assimilation box, the top of the bottom and connect base of the cube assimilation box in the connect base of blank sample prescription
It is equipped with；
S4, each cube assimilation box is proceeded as follows：Connection one is for measuring steam outside cube assimilation box
The infrared gas analyser of concentration changes with time simultaneously measures, and a temperature detector and pressure are equipped in cube assimilation box
Force detector；Measure the volume of cube assimilation box and the floor area of cube assimilation Bin covering；
S5, the water flux for calculating each cube assimilation box, respectively obtain the evapotranspiration of experiment sample prescription and blank sample prescription.Even
It is a cyclic structure to connect pedestal, is communicated up and down, and the bottom of cube assimilation box is identical as pedestal, and top is closed.
The herbicide is glyphosate-isopropylammonium.Generally 150 times of conducts are diluted using 41% glyphosate-isopropylammonium to remove
Careless agent is used.Using the advantages of glyphosate-isopropylammonium be it is non-selection post-emergence herbicide, to perennial deep root weeds,
The biennial grassy weed of 1 year cheekbone and nutgrass flatsedge have special efficacy, are commonly used in corn, cotton, Soybean Field and orchard, and can be used for
Bare place weeding.The mechanisms of glyphosate-isopropylammonium are to destroy root structure, to achieve the purpose that weeding, therefore are being surveyed
Rudiment will not be generated, due to the stand-by period to influence final measurement result during amount.This kind of herbicide compared with
Other herbicides have very big advantage.
Vapour concentration in the infrared gas analyser constant duration METHOD FOR CONTINUOUS DETERMINATION record case is vertical sit with vapour concentration
Mark, the time is abscissa, takes at least preceding ten data of vapour concentration to carry out linear fit, works as R2>Receive fitting when 0.98
As a result, it is dc/dt to take slope, if R2≤ 0.98, then remove first vapour concentration data, increase immediately behind a steam
Concentration data carries out linear fit again, and so on until obtaining satisfactory R2, and it is dc/dt to take slope.
The water flux is denoted as Fh, unit mmol.m-2.S-1：Fh=1000VPav/RS(Tav+273)×dc/dt；
Wherein：The volume of cube assimilation box is denoted as V, unit m3, temperature detector detection infrared gas analyser measurement
Period obtains mean temperature Tav, unit DEG C, cube assimilation Bin covering floor area be denoted as S, unit m2, pressure detector inspection
It surveys during infrared gas analyser measures and obtains mean temperature Pav, unit kPa, dc/dt indicate that vapour concentration changes over time speed
Rate, R are ideal gas constant, take R=8.314J.mol-1.K-1。
The corresponding F of the experiment sample prescriptionhIt is denoted as E, the corresponding F of the blank sample prescriptionhIt is denoted as ET, the transpiration of plant is strong
Degree is denoted as T, T=ET-E.E is the water flux of the soil evaporation of sample prescription, and ET is the evaporation of the entire ecosystem and rising water
Flux, therefore the water flux for the transpiration that T is plant.
The vapour concentration cube assimilation box capping after immediately begin to measure, time interval 1S, detection it is total when
Between no less than 20S, be no more than 40S.Due to needing the variation in a closed box in-vivo measurement vapour concentration, if there are one
The isolation of a long period can make moisture convergence overlong time, influence measurement result, therefore measure in short-term immediately using one
Mode carry out the measurement of vapour concentration variation.
A soil moisture probe is set near the cube assimilation box in soil, and soil water-containing is measured using soil moisture instrument
Amount is equipped with a relative humidity detector in cube assimilation box；The depth that the soil moisture probe is inserted into soil is 5cm；
The soil moisture instrument is TDR100.For being monitored to environment, integrated environment is made with characterizing various Different treatments
At the trend and degree of influence.
Several fans are additionally provided in cube assimilation box.Fan is used to disturb the air in cube assimilation box, generally
Using being oppositely arranged two fans at the top of cube, and the fan that can be also arranged towards cube assimilation box corner in side comes
It avoids generating dead angle.
The sample prescription further includes comparison sample prescription, and the comparison sample prescription is handled in such a way that flush with ground cradles surface vegetation,
And the plant part of ground eruption is wiped out before each measure.Comparison sample prescription is also required to same using installation connect base and cube
Change the mode of case, and is measured using S4 and S5.
In S3, two days are waited at least for and state of naturally shading when plant being maintained to survive after spraying herbicide, then again
It is measured.Ensure the original shape of plant as far as possible, avoids impacting the evaporation in soil.
During the test, with having taken three pieces of samples altogether, with respectively herding sample with being denoted as sample 1, it is denoted as sample with sealing sample
Ground 2 and with opening up wasteland sample with being denoted as sample 3, takes experiment sample prescription, comparison sample prescription and blank sample prescription, for difference respectively on the ground in three samples
Processing mode for sample prescription environment influence by be arranged relative humidity detector, temperature detector, soil moisture probe into
Row measures, and is changed into as saturated water draught head by relative humidity and temperature, and specific measurement result is as follows：
As can be seen from the above table, relative to comparison sample prescription, experiment sample prescription is more close with the parameter of blank sample prescription, therefore says
It is bright, using experiment sample prescription, edaphic condition, vegetation are covered and the change of original environmental factors such as ground table status is smaller.
It when specifically being measured, each evapotranspires and measures in sample prescription, before the assay the one square-shaped metal pedestal of placement in two weeks
(50cm × 50cm, high 10cm).Pedestal lower edge is sharp, facilitate indentation soil in, while there are 3cm height height be unearthed face so as to
Close connection cube assimilation box.FhBy a cube assimilation box (50cm × 50cm × 50cm), the bottom of cube assimilation box
Portion is communicated with pedestal, the top seal of cube assimilation box, and cube assimilation box connects an infrared gas analyser (LI-
6400, LI-COR Inc., Lincoln, NE, USA) it is directly measured in sample prescription, terramycin dregs E corresponds to experiment sample prescription, ecology
The transpiration of system entirety corresponds to ET.Several fans are installed in assimilation box, to the mixing air during measurement, a temperature
Degree probe is placed on assimilation box center and measures air themperature, and a soil moisture probe is inserted near assimilation box and is used in soil
In the depths the measurement 5cm soil moisture, while soil volume of aqueous is determined using TDR100.Cube assimilation box is suitably put
After setting on pedestal, LI-6400 is according to input program, vapour concentration 30 seconds in automatic continuous mensure case, and record per second is primary.Number
According to taking 1-10 points to carry out linear fit from the beginning, work as R2>Receive slope when 0.98 to calculate Water Flux, otherwise moves
Repeat linear fit to 2-11 points, then judges R2>0.98, if being unsatisfactory for condition, continue to take 3-12 points, and so on
Until getting satisfactory R2>0.98, it is dc/dt to take slope.If not getting the linear fit of the condition of satisfaction, weight is needed
New placement cube assimilation box measures.
Ecosystem Water Flux is calculated by following equation：
Fh=1000VPav/RS(Tav+273)×dc/dt (1)
The transpiration of plant is calculated with following formula：
T=ET-E (2)
Wherein：Fh, unit mmol.m-2.S-1, the volume of cube assimilation box is denoted as V, unit m3, temperature detector detection
Infrared gas analyser obtains mean temperature T during measuringav, unit DEG C, cube assimilation Bin covering floor area be denoted as S,
Unit m2, mean temperature P is obtained during pressure detector detection infrared gas analyser measurementav, unit kPa, dc/dt indicate water
Vapour concentration changes with time rate, R are ideal gas constant, take R=8.314J.mol-1.K-1。
If the average daily evapotranspiring amount of the ecosystem need to be obtained, the time can be integrated to obtain by E, ET, the day of plant
Equal transpiration water consumption can be obtained by mathematic interpolation.
Above-mentioned specific implementation mode cannot function as limiting the scope of the invention, for the technology people of the art
For member, any alternate modification or transformation made to embodiment of the present invention are all fallen in protection scope of the present invention.
Place is not described in detail by the present invention, is the known technology of those skilled in the art of the present technique.
Claims (10)
1. a kind of method measuring grassland evapotranspiration using herbicide, it is characterised in that：Include the following steps：
S1, selected sample, sample prescription is set in sample ground, and the sample prescription includes experiment sample prescription and blank sample prescription；
S2, connect base is set on the periphery of each sample prescription, the connect base bottom is inserted into soil, and top is elevated above the soil；
S3, herbicide is sprayed in testing sample prescription, the plant in sample prescription to be tested all kills, then respectively in experiment sample prescription and sky
Cube assimilation box is installed, the bottom of the cube assimilation box and the top of connect base coordinate in the connect base of white sample prescription
Setting；
S4, each cube assimilation box is proceeded as follows：Connection one is for measuring vapour concentration outside cube assimilation box
The infrared gas analyser that changes over time simultaneously measures, and a temperature detector is equipped in cube assimilation box and pressure is examined
Survey device；Measure the volume of cube assimilation box and the floor area of cube assimilation Bin covering；
S5, the water flux for calculating each cube assimilation box, respectively obtain the evapotranspiration of experiment sample prescription and blank sample prescription.
2. a kind of method measuring grassland evapotranspiration using herbicide according to claim 1, it is characterised in that：
The herbicide is glyphosate-isopropylammonium.
3. a kind of method measuring grassland evapotranspiration using herbicide according to claim 1, it is characterised in that：
Vapour concentration in the infrared gas analyser constant duration METHOD FOR CONTINUOUS DETERMINATION record case, using vapour concentration as ordinate, the time
For abscissa, takes at least preceding ten data of vapour concentration to carry out linear fit, work as R2>Receive fitting result when 0.98, takes
Slope is dc/dt, if R2≤ 0.98, then remove first vapour concentration data, increase immediately behind a vapour concentration number
According to, carry out linear fit again, and so on until obtained R2>0.98, and it is dc/dt to take slope at this time.
4. a kind of method measuring grassland evapotranspiration using herbicide according to claim 3, it is characterised in that：
The water flux is denoted as Fh, unit mmol.m-2.S-1：Fh=1000VPav/RS(Tav+273)×dc/dt；
Wherein：The volume of cube assimilation box is denoted as V, unit m3, during temperature detector detection infrared gas analyser measurement
To mean temperature Tav, unit DEG C, cube assimilation Bin covering floor area be denoted as S, unit m2, pressure detector detects infrared
Gas analyzer obtains mean temperature P during measuringav, unit kPa, dc/dt indicate that vapour concentration changes over time rate, and R is
Ideal gas constant takes R=8.314J.mol-1.K-1。
5. a kind of method measuring grassland evapotranspiration using herbicide according to claim 4, it is characterised in that：
The corresponding F of the experiment sample prescriptionhIt is denoted as E, the corresponding F of the blank sample prescriptionhIt is denoted as ET, the transpiration intensity of plant is denoted as T, T
=ET-E.
6. a kind of method measuring grassland evapotranspiration using herbicide according to claim 3, it is characterised in that：
The vapour concentration immediately begins to measure after the capping of cube assimilation box, and the total time of time interval 1S, detection are no less than
20S, it is no more than 40S.
7. a kind of method measuring grassland evapotranspiration using herbicide according to claim 1, it is characterised in that：
A soil moisture probe is set near the cube assimilation box in soil, and soil moisture content is measured using soil moisture instrument, vertical
A relative humidity detector is equipped in cube assimilation box；The depth that the soil moisture probe is inserted into soil is 5cm.
8. a kind of method measuring grassland evapotranspiration using herbicide according to claim 1, it is characterised in that：
Several fans are additionally provided in cube assimilation box.
9. a kind of method measuring grassland evapotranspiration using herbicide according to claim 7, it is characterised in that：
The sample prescription further includes comparison sample prescription, and the comparison sample prescription is handled in such a way that flush with ground cradles surface vegetation, and each
The plant part of ground eruption is wiped out before measurement.
10. a kind of method measuring grassland evapotranspiration using herbicide according to claim 1, feature exist
In：In S3, waits at least for two days and state of naturally shading when plant being maintained to survive after spraying herbicide, then surveyed again
It is fixed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111256775A (en) * | 2020-02-25 | 2020-06-09 | 兰州大学 | Assimilation box system for rapidly determining effective volume and using method |
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2018
- 2018-01-24 CN CN201810067902.5A patent/CN108344707A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| LI YUZHE ET AL.: "《Research Article Influence of Land Use Patterns on Evapotranspiration and Its Components in a Temperate Grassland Ecosystem》", 《ADVANCES IN METEOROLOGY》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111256775A (en) * | 2020-02-25 | 2020-06-09 | 兰州大学 | Assimilation box system for rapidly determining effective volume and using method |
| CN111256775B (en) * | 2020-02-25 | 2021-05-28 | 兰州大学 | Assimilation box system for rapidly determining effective volume and using method |
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