Three cylinder compensative evaporation and permeability instrument measurement

A compensating, open-tube technology, used in measuring devices, liquid/fluid solids measurement, instruments, etc., can solve the problems of lack of plant evapotranspiration observation system data, etc., and achieve simple operation and maintenance, high precision, and small footprint. Effect

Inactive Publication Date: 2004-04-21
DALIAN UNIV OF TECH
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Problems solved by technology

China's wetland research has just started, and there is a lack of systematic data on plant evapotranspiration observations in wetland environments

Method used

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  • Three cylinder compensative evaporation and permeability instrument measurement
  • Three cylinder compensative evaporation and permeability instrument measurement
  • Three cylinder compensative evaporation and permeability instrument measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] The method and specific implementation steps for measuring the evapotranspiration of reeds in Zhalong Wetland by using the three-tube compensating lysimeter are as follows:

[0030] step 1

[0031] Three stainless steel cylinders (the specifications are all 1.5-2mm wall thickness, 120cm high, and cylinder mouth area 3000cm 2 , Diameter of 61.8cm, equivalent to the area and diameter of the standard E-601 evaporating dish) is installed in the reed growing area in a layout with the center of the circle spaced 90 cm apart and the center of the circle is on a straight line. When installing, put the cylinder on the reed 9 without disturbing its growth environment. The steel cylinder handrails 6 are pressed into the lower layer of silt evenly after applying force, and the depth is 80-90cm. At this time, the free water surface 7 in the cylinder is 30-40cm away from the mouth of the cylinder. .

[0032] Step 2

[0033] will figure 1 , 2 The reed 9 in the tube shown is cut 10 cm abo...

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Abstract

In the method, three steel through cylinders are directly pressed into environment for water plant growth, of which the cylinder with open at upper part contains protophyte, the other cylinder with open at upper part contains free water surface to process plant stalk and the cylinder with sealed top contains free water surface in normal pressure. The ultrasonic transducer is utilized to measure variation of water level to carry on direct measurement for plant vaporization and evaporation, water surface evaporation and bottom packing leakage according to mutual compensation relationship of three cylinders and the method applied does not damage growth state for the plant at all.

Description

Technical field [0001] The invention belongs to the technical fields of plant physiology, ecological monitoring and wetland meteorological and hydrological measurement. It involves the automatic observation of the evapotranspiration of aquatic plants in the wetland environment, the evaporation of free water surface, and the infiltration in the wetland environment. Especially related to the method of comparative observation of plant evapotranspiration, water surface evaporation, and wet ground infiltration. Background technique [0002] At present, the measurement methods for plant evapotranspiration, water surface evaporation and infiltration at home and abroad are mainly divided into four categories: [0003] The first category, the lysimeter method, uses the mass balance method to determine the amount of evapotranspiration and infiltration of various plants, for example, Liu Shiping’s "new lysimeter and its application in farmland hydrological process research" Overlysimeter. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296G01N7/00
Inventor 许士国王昊
Owner DALIAN UNIV OF TECH
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