Multi-water level vegetation evapotranspiration measuring device

A measuring device and evapotranspiration technology, which are applied to measurement devices, lubrication indicating devices, engine components, etc., can solve the problems of difficulty in determining vegetation evapotranspiration, unclear composition of evaporative water consumption on the underlying surface, etc., and achieve a simple and practical structure. The effect of strong performance and high measurement accuracy

Inactive Publication Date: 2009-12-09
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

This device can solve the problem that the actual evapotranspiration of vegetation is difficult to determine and the co

Method used

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  • Multi-water level vegetation evapotranspiration measuring device
  • Multi-water level vegetation evapotranspiration measuring device
  • Multi-water level vegetation evapotranspiration measuring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0016] Choose two sets of the same multi-stage water level evapotranspiration measuring device. Plant the vegetation that needs to be monitored in a cultivation bucket (1) (recorded as No. 1 cultivation bucket), and fill an equal amount of soil in another cultivation bucket (1) (record as No. 2 cultivation bucket) but do not plant any vegetation, as a reference. At the beginning of the experiment, the valves (3) were closed respectively, and the adjustable support (6) was adjusted to the required height, so as to realize the constant water supply of the Markov bottle (5) with scale. Inject a sufficient amount of water into No. 1 and No. 2 graduated Martens flasks (5) respectively. Open the valve (3) to start the monitoring experiment. During the experiment, ensure that the water level in the graduated Martens flask (5) is not lower than the water supply height.

[0017] During the monitoring period, the monitoring start time records the water level heights in the two graduat...

Embodiment 1

[0029] Cultivate aquatic vegetation reeds in Beijing. Under fine weather conditions, the multi-stage water level vegetation evapotranspiration measurement system is used to measure the evapotranspiration water consumption of the reed community and the water surface evaporation water consumption. 2 and 3000cm 2 .

[0030] Table 1 The measured value of the Martens flask and the calculated value of evapotranspiration before and after the experiment

[0031]

Embodiment 2

[0033] Cultivate terrestrial cotton in a certain place in Beijing. Under fine weather conditions, the evapotranspiration water consumption and soil evaporation water consumption of aloe cotton were measured by a multi-stage water level vegetation evapotranspiration measurement system. 700m 2 and 3000cm 2 .

[0034] Table 2 The measured value of the Martens flask and the calculated value of evapotranspiration before and after the experiment

[0035]

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Abstract

The invention relates to a vegetation evapotranspiration measuring device, in particular to a device for measuring vegetation evapotranspiration, soil evaporation and water surface evaporation at multiple water levels. The device consists of a cultivating system and a water supply system, and comprises parts such as a cultivating vat made of an ABS engineering plastic material, a water supply pipe, a porous pipe and a Malpighian bottle with a scale. Fixed-water level water supply at different water levels is realized by adjusting the height of the Malpighian bottle. The change of the water levels in the Malpighian bottle is recorded before and after an experiment; and conversion is carried out by combining a cross-sectional area ratio of the Malpighian bottle to the cultivating vat to obtain water consumption for vegetation evapotranspiration in the cultivating vat. Different cultivating vats are compared in water consumption to obtain water consumption for underlaying surface (a water surface or soil) evaporation and the water consumption for vegetation transpiration so as to realize the separation a vegetation transpiration capacity from a soil evaporation capacity. The device has mechanical connection, simple structure, low cost, stability, reliability convenient maintenance and strong practicality and accuracy up to 0.1 mm and can completely meet accurate measurement of a vegetation evapotranspiration capacity and an underlaying surface evaporation capacity.

Description

technical field [0001] The invention belongs to the fields of environmental science, ecological monitoring and farmland water conservancy measuring devices. It involves the determination of evapotranspiration from terrestrial vegetation to aquatic vegetation, soil evaporation, and water surface evaporation, especially the observation device for vegetation (including aquatic and terrestrial) evapotranspiration. Background technique [0002] In recent years, due to the development of environmental protection and ecological restoration research, the monitoring and prediction of vegetation water consumption has become an important basis for the determination of vegetation structure type configuration and distribution area. At present, the direct measurement methods for vegetation evapotranspiration at home and abroad mainly include lysimeter method, eddy correlation method, stomatometer method and plant sap flow meter method. Due to the limitations of current technical conditio...

Claims

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Application Information

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IPC IPC(8): G01F23/02
CPCG01N33/246
Inventor 杨志峰王强
Owner BEIJING NORMAL UNIVERSITY
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