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Study on Water Transporting Mechanism in Plant and Water Requirement Information

Author: WangRui
Tutor: YuHaiYe
School: Jilin University
Course: Agricultural Biological Environmental and Energy Engineering
Keywords: Greenhouse Water transport Water Information Irrigation Electric signal
CLC: S311
Type: Master's thesis
Year: 2005
Downloads: 211
Quote: 0
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Abstract


China is short of water increasingly, while water environment ingreenhouse is extremely important to crop’s growth. Based on water saving, ithas important significance in theory and use, to create favorable waterenvironment and grasp rules of water transform and consume and confirmwater requirement information and its collection.In this paper, crop’s physiological water requirement mechanism andtraits of crop water movement, influencing variables in water movement andtheir relationships were analyzed. Water movement model was established.Methods in inspecting water requirement which were based on environmentalfactors before were tried to be changed into the diagnostic which based onphysiological signals. Based on the correlative researches, under differentwater conditions and different stimulates, experiments and analyses of crops’electrical signal were carried out.Water stress grads are drive force in crop water movement and waterflows from high water stress to low water stress. Water is sucked from root andflows in xylem to the direction which the water stress decreases. There arebiggish differences of plant water transporting mechanism to the differentrising degree. Main parameters in determining water flow are: water stress,water resistance, water capacity.Based on Van-den Honert tentative equation of water movement, therelationship between parameter-water stress and water resistance wereanalyzed in detail. The mechanism of water movement inside plant was alsoanalyzed and limitations of equation Van-den Honert were summarized. Because of the water capacitive domino effect, the movement inside plantis not steady flow but instant flow. According to the conservation of mass andtraits of leaf seepage and the model of crop’s water movement ofthree-dimensional in microcosmic was deduced. Based on certain supposing,boundary condition was analyzed. In the analysis, control equation of plantwater in microcosmic was analyzed by using limited element method. Cropwater stress field and velocity field were simulated by theanalyzing in steadystate and instant state.According to the crop water instant flow ‘s traits , plant water capacity,water resistance and transpiration are referenced variables, the model of waterstress of liquid flow which changes with time was deduced. According toplant’s water flow traits in SPAC, plant liquid flow’s traits and gas flow wereanalyzed. It shows: because of plant water capacity, the stem sap flow is slowerthan rising obviously. Crop has the ability to regulate itself to over rising which

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CLC: > Agricultural Sciences > Agriculture ( agronomy ) > Principles of Crop Biology, cultivation techniques and methods > Crop Physiology
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