Forest litter rain interception and evaporation observing apparatus and method
An observation device and a litter technology, which are applied in the field of forest litter rainfall interception and evaporation observation devices, can solve the problems of difficult long-term stable observation, structural errors in measurement, and damage to the litter structure, and achieve litter interception. The effect of accurate volume and moisture evaporation and simple method
Pending Publication Date: 2019-03-01
INST OF FOREST ECOLOGY ENVIRONMENT & PROTECTION CHINESE ACAD OF FORESTRY
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[0003] At present, in the research of forest litter interception rainfall, the maximum interception capacity of litter is mostly obtained through laboratory simulation, while in field observation experiments, the interception precipitation dynamics of forest litter layer is mostly determined by measuring the moisture content dynamics of litter. estimated by the method, because the structure of the litter is destroyed, there is a large error in the measured structure, and it is difficult to observe stably for a long time
For the observation of water evaporation in the litter layer, at present, the soil layer and the litter layer are regarded as a whole, and the soil evaporation under the forest is measured by the lysimeter method, and the intercepted precipitation and water evaporation dynamics of the litter layer cannot be known. Its role in the ecohydrological cycle
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[0031] According to the principle of water balance, the total amount of penetrating rainfall (P) in the forest should be equal to the sum of the water volume change (△S), seepage (L) and evaporation (E) of the forest litter layer,
[0032] That is, P=△S+L+E,
[0033] When there is a rainfall process, since the air relative humidity in the forest is very high at this time and there is no solar radiation, it can be approximately considered as no evaporation or infinitesimal, that is, E≈0, so the water balance formula can be simplified as △S =P-L, at this time △S is the amount of rainfall intercepted by forest litter.
[0034] When no rainfall occurs, the rainfall input is zero, and the water leakage L of the litter layer can be approximately assumed to be zero. According to the water balance formula, E=△S, the change of water in the litter layer is mainly due to evaporation quantity.
[0035] Such as figure 1 , figure 2 , image 3 As shown, the forest litter rainfall inter...
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The invention relates to a forest litter rain interception and evaporation observing apparatus and method, wherein the apparatus herein comprises an observing tray, as well as a self-recording rainfall barrel; a strainer is arranged in the observing tray; a bottom plate in the observing tray is provided with a guide hole; the guide hole is connected with a leaking water observing barrel through awater guide pipe. The method herein includes the steps of I, determining the installation position of the forest litter rain interception and evaporation observing apparatus; II, mounting the forest litter rain interception and evaporation observing apparatus, and determining initial parameters; III, carrying out forest litter rain interception and evaporation observation; IV, calculating litter rain interception and water evaporation. The apparatus and method herein are suitable for observing rainfall intercepted by forest litter and litter water evaporation after raining; the measured litterinterception and water evaporation are more accurate; the apparatus and method are also suitable for long-term dynamic observation, and scientific references are provided for more objective evaluation on the hydrological ecological functions, such as forest water conservation function.
Description
technical field [0001] The invention relates to the field of testing by means of measuring the physical properties of materials, in particular to a forest litter rainfall interception and evaporation observation device and method. Background technique [0002] The forest litter layer is an important carrier of the ecological hydrological cycle, and plays an important ecological function in intercepting rainfall, preventing soil erosion, and improving soil structure. Part of the precipitation intercepted by the forest litter layer infiltrates into the soil layer, and part of it is lost to the surrounding environment through evaporation. Therefore, the forest litter layer plays an important role in regulating the hydrological cycle process, thereby affecting the forest hydrological ecological process. [0003] At present, in the research of forest litter interception rainfall, the maximum interception capacity of litter is mostly obtained through laboratory simulation, while i...
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IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 徐丽宏王云霓王彦辉于澎涛刘泽彬曹恭祥王晓熊伟左海军
Owner INST OF FOREST ECOLOGY ENVIRONMENT & PROTECTION CHINESE ACAD OF FORESTRY