Vegetation evapotranspiration monitoring device and method suitable for complex surface

A complex surface and vegetation technology, applied in ecological monitoring and meteorological and hydrological measurement, meteorological and hydrological, ecology, plant physiology, agriculture and forestry fields, can solve the problems of difficult vegetation evapotranspiration measurement

Inactive Publication Date: 2015-03-25
INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the difficult problem of measuring vegetation evapotranspiration in complex surface areas such as karst areas, and provides a method for monitoring vegetation evapotranspiration suitable for complex surfaces. Vegetation evapotranspiration in complex surface areas
[0004] Another object of the present invention is to provide a vegetation evapotranspiration monitoring device suitable for complex land surfaces. ) The problem of difficult measurement of vegetation evapotranspiration is of great significance for guiding agricultural and forestry production and promoting the research of ecosystem water cycle.

Method used

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  • Vegetation evapotranspiration monitoring device and method suitable for complex surface
  • Vegetation evapotranspiration monitoring device and method suitable for complex surface
  • Vegetation evapotranspiration monitoring device and method suitable for complex surface

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for monitoring vegetation evapotranspiration suitable for complex land surfaces. Its basic principle is to measure vegetation evapotranspiration based on the change of air humidity in a closed space caused by vegetation evapotranspiration and the difference in air humidity exchanged between a closed space and the environment (outside). (ET). The steps are:

[0039] Step A, the target plant sample block (such as 1m 2 Corn crop) is covered with an airtight transparent cover box 1, and the specific process is: the base (11) is installed on the surface of the target sample plot, and the length of the four telescopic box legs (12) of the base is adjusted to keep the base level and stable; Dig a shallow soil groove at the place where there is soil below the base, and bury the soft transparent material (13) of the base. If there are rocks exposed at the installation place and it is difficult to excavate, then the pits on the rock surface will be basically filled up w...

Embodiment 2

[0048] Example 2: The test for measuring the evapotranspiration of corn potted plants is mainly used for measuring the accuracy of the detection device. The specific process is: (A) the base 11 is installed on the dry cement board (floor) (the dry cement board evapotranspiration is 0, so the measured evapotranspiration is all contributed by potted plants), adjust the length of the four telescopic box legs 12 of the base, so that The base is basically kept level and stable; (B) press the soft transparent material 13 on the base 11 with a small sandbag to ensure good contact between the floor and the soft transparent material (no need to ensure strict sealing); (C) weigh the potted corn After weighting, place it in the base, carefully place the transparent cover box 1 above the base (the lower edge of the cover box is put into the sealing groove 14); (D) install the air inlet duct 5 and the air outlet duct 4 on the transparent cover box, and place the outlet Trachea links to eac...

Embodiment 3

[0049] Embodiment 3: Field monitoring test, mainly to investigate the stability and reliability of the device of the present invention in field operation. The test site is located somewhere in the Huanjiang Karst Ecological Research Station of the Chinese Academy of Sciences. The local area is a typical limestone-type karst peak-cluster depression, with discontinuous soil distribution, complex surface features and overgrown rocks. The device was installed in the grassland of the test site, and the test time was from noon on the first day to noon on the second day, and the weather was fine. The specific process is: (1) adjust the length of the legs 12 of the base 11 according to the actual surface conditions, so that the base 11 is installed horizontally on the ground; Embedding; and at the rock exposed place, then first use soil to fill up the rock surface pothole, then use small sandbags to push down the soft transparent material 13 of the base to ensure that the rock and th...

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Abstract

The invention discloses a vegetation evapotranspiration monitoring device suitable for a complex surface. According to the vegetation evapotranspiration monitoring device disclosed by the invention, by regulating air flows at the inlet and the outlet and combining a stirring fan, the air humidity condition in a hood box of the vegetation evapotranspiration monitoring device is regulated, and water vapor is prevented from condensing; a base of the vegetation evapotranspiration monitoring device is provided with telescopic seat legs and a soft transparent sealing material and does not have a need of ensuring strict sealing when being mounted, so that the mounting difficulty is greatly weakened, and the vegetation evapotranspiration monitoring device is suitable for being mounted and used under the complex surface condition; as being mounted on the ground surface, the vegetation evapotranspiration monitoring device has small influence on the underground hydrology process including groundwater replenishment and soil moisture movement. The invention also discloses a vegetation evapotranspiration monitoring method suitable for the complex surface. According to the vegetation evapotranspiration monitoring method disclosed by the invention, the evapotranspiration rate of vegetation is determined by determining variations of temperature and humidity of air in the sealed box body caused by vegetation evapotranspiration and a humidity difference of exchanged air; the accuracy is high, and dynamic variation of vegetation evapotranspiration can be captured. The vegetation evapotranspiration monitoring device has a simple and clear structure, is flexible in size, convenient and simple in mounting and low in cost and can be widely applied to the fields including the ecological field, the meteorological field, the hydrological field and the agriculture and forest field.

Description

technical field [0001] The invention belongs to the technical fields of plant physiology, ecological monitoring and meteorological and hydrological measurement, and specifically relates to a method for monitoring vegetation evapotranspiration applicable to complex surfaces, and also relates to a monitoring device for vegetation evapotranspiration applicable to complex surfaces. The invention can be widely used in fields such as agriculture, forestry, ecology, meteorology and hydrology. Background technique [0002] With the development of population and economy, the problem of global water resource shortage is becoming more and more serious, especially in arid and semi-arid areas, karst and other areas, where water is the controlling factor of the ecological environment. Vegetation evapotranspiration is an important link in the material cycle of ecosystems, and an important parameter for agricultural irrigation, hydrological research and forecasting, and water resource manag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01F22/00
Inventor 刘梅先徐宪立张荣飞
Owner INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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