Studies On Photosynthetic Physiology And Water Consumption Characteristics Of Main Tree Species In Semi-arid Region On Loess Plateau

Aiming to solve the problem of scarce water resources in the construction of forest vegetation in semi-arid region on Loess Plateau and based on the theory of soil-plant-atmosphere continuum, the dissertation chose the main afforestation tree species of Ulmus pumila, Pinus tabulaeformis, Caragana microphylla, Robinia pseudoacacia, Platycladus orientalis, Prunus armeniaca, Acer truncatum and Hippophae rhamnoides in the station of"Runoff Forestry"of Beijing Forestry University in Fangshan Country, Shanxi Province in two growing seasons from 2004 to 2005, utilized portable steady porometer (Li-1600) and portable photosynthesis system (Li-6400), systematically analyzed characteristics of drought resistant and preferred soil water of tested tree species, measured and calculated evapotranspiration of stand and water requirement of forest tree. These studies could provide the scientific bases for choice of drought tolerant trees, appraisement of preferred soil water of forest land and accurately estimating ecological water consumption tree species.The dissertation involved following aspects:(1) Dynamic analysis of precipitation resource in semi-arid region on Loess Plateau(2) Photosynthetic Physiology of main planting tree species(3) Analysis of preferred soil water of forest land(4) The rule of testing woodland soil evaporation(5) The simulation and prediction of stands transpiration and water consumption(6) Evapotranspiration Characteristics of stand(7) Water requirement of forest tree and plant coefficient of forest treeMajor conclusions are summarized as follows:...