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The Research of Desert Plants-Tamarisk Photosynthesis, Transpiration and Water Consumption Regularity in Manas River Basin
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Author: Guang Yang, Xinlin He, Cui Wang, Junfeng Li
Abstract: This paper adopts the measurement technology of Thermal Dissipation Probe System to study the law of water consumption of typical desert plants tamarix in Manasi River Basin and its correlation of meteorological factors. At the same time, we studied the relationship between photosynthesis and transpiration and environmental factors, and established the relationship between transpiration of tamarix chinensis and the evaporation of the reference crop. The results are as follows: (1) the tamarix sap flow density is greatly affected by solar radiation, temperature and air humidity, so the average density in the sunshine after the rain is more than that in a sunny day; and the density in a sunny day is also more than that in a rainy day. The transpiration of the tamarisk scale had a significantly correlation with that of its canopy scale (R2=0.719). (2) In the test-pit and field experiments, the PAR is the main decision variables of net photosynthetic rate of artificial and native desert tamarisks and the RH is the major limiting variables of native tamarisks. The mean value Tr of this two experiments of tamarisk turns to maximum, and the daily average value WUE of tamarisk is around 1.12 in July. (3) Liquid flow value of tamarix chinensis in 2012 and 2013 respectively is 97mm and 103mm in the test-pit experiment as well as 45mm and 53mm in the field experiment; The fastigium of tamarix water consumption lies in June and July.(4)There is a significant linear relation between the reference crop evapotranspiration (ET0) and tamarisk transpiration water consumption (SF), which can be illustrated in such a formula: ET0 = 1.495 + 0.737 SF, R2 = 0.610.
Keywords: Sap Flux Density; Tamarisk; Meteorological Factors; Photosynthetic Rate and Transpiration Rate; Manas River Basin
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