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Method for determining grassland evapotranspiration by using of herbicide

A technology of transpiration and herbicides, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problem of in-depth understanding of the causes and detailed regulation mechanisms of evapotranspiration changes in ecosystems, large footprints, and difficult to distinguish accurately Differences in moisture flux, etc.

Inactive Publication Date: 2018-07-31
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

The eddy correlation system can automatically measure and record the evapotranspiration intensity of the ecosystem for a long time, but because of its large measurement footprint, it is difficult to accurately distinguish the difference in water flux at the same site or in adjacent areas
In addition, ecosystem evapotranspiration is composed of surface E (land evaporation) and canopy T (plant transpiration). Current research often fails to accurately split the two sources of evapotranspiration, so it is difficult to understand the reasons for ecosystem evapotranspiration changes. and detailed control mechanism

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  • Method for determining grassland evapotranspiration by using of herbicide

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Embodiment Construction

[0023] In order to clearly illustrate the technical characteristics of this solution, the present invention will be described in detail below through specific implementations.

[0024] A method for measuring grassland evapotranspiration using herbicides includes the following steps:

[0025] S1. Select a sample plot and set a sample plot in the sample plot. The sample plot includes a test plot and a blank plot;

[0026] S2. Connecting bases are arranged on the periphery of each sample square, and the bottom of the connecting base is inserted into the soil, and the top of the connecting base extends out of the ground;

[0027] S3. Spray herbicides in the test sample, and after all the plants in the test sample are killed, install a cube assimilation box on the connection base of the test sample and the blank sample respectively, and the bottom of the cube assimilation box is connected to Set up with the top of the base;

[0028] S4. Perform the following operations on each cube assimila...

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Abstract

A method for measuring grassland evapotranspiration by using of a herbicide includes the following steps: selecting a sample site, setting connection bases at the periphery of each quadrat, spraying the herbicide in a test quadrat, determining parameters for each cubic assimilation tank, and calculating the water flux of each cubic assimilation tank to obtain respectively the evapotranspiration ofthe test quadrat and a blank quadrat. Compared with a contrast quadrat subjected to clipping treatment, the herbicide treated test quadrat can obtain an ecosystem, namely the blank quadrat, closer toa contrast, and due to the original cover condition and the surface state, the evaporation and transpiration composition of the evapotranspiration of the ecosystem can be more accurately determined.

Description

Technical field: [0001] The invention relates to a method for measuring grassland evapotranspiration by using herbicides. Background technique: [0002] Moisture is an important limiting factor affecting productivity and regional environment in arid and semi-arid grasslands in northern China. Evapotranspiration is a core component of the global energy and water balance and ecosystem water exchange process. Many ecosystem processes, such as plant photosynthesis, soil water content, biochemical cycling, and energy budget composition are all affected by evapotranspiration. The evapotranspiration levels and dynamic processes among ecosystems vary greatly among different vegetation types, different meteorological and climatic conditions, and different soil properties. Changes in the use and management of grasslands in northern China are likely to change the local water budget and water balance. Therefore, study how the changes in grassland vegetation cover, soil forms and correspon...

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Application Information

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IPC IPC(8): G01N21/3504G01D21/02
CPCG01D21/02G01N21/3504
Inventor 李愈哲樊江文
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS