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《Journal of Northwest Sci-tech University of Agriculture and Forestry(Natural Science Edition)》 1983-03
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A Preliminary Discussion on the Functions of Thermodynamics In the Balance of Movement of Energy of Water in spac

Zhang Jun-chang Northwestern College of Agriculture  
In recent years,the research on the potential energy of soil wa- ter movement is not only in the soil itself but also in the plant physiology.Moreover,it involves the energy of water in atmosphere, that is,the research of the orders of process of the soil water pass- ing through plants to atmosphere is served as an unificational mov- ing state continiuum. The research in this paper is based on the functions of thermo- dynamics: (1)the functions of thermodynamics of the water movement in atmosphere; (2)the functions of thermodynamics of forming rain drops; In China's Iunar calender,“Grain rain”,“Light snow”“Cold dews”“Float frost falls”etc,are to keep in obedience to this law, too; (3)the functions of water movement from the run-off to ri- ver,open channel and cropfields; (4)Spac energy relationships.The free energy level of water was seen to be a major controlling factor indeterming soilwater be- harlor,as water moves through the soil to plant roots and through root cells into the plant xylem of stems up to the leaves,and evapo- rates from the leaf surface.And its tendency to move is determined by differences in free energy levels of water,or by the moisture po- tential; (5)water moves through the Spac.As the water moves thro- ugh the Spac,the movement of water meets with resistance in every step,i.e.there are two primary factors determing whether plants are well supplied with water:(a)the rate at which water is supplied by the soil to the absorbing roots,and(b)the rate at which water eva- porates from the plant leaves,as when the electric resistance occurs in the movement of electric current.And therefore,we can make the pattern calculation by means of electric model in accordance with the law of energy Conservation and ohm's law.
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Chinese Journal Full-text Database 2 Hits
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8 Zou Chaowang~(1,2),Xue Xuzhang~(2),Zhang Renduo~3(1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,Wuhan 430072,China;2.National Engineering Research Center for Information Technology in Agriculture,Beijing 100089,China;3.School of Environmental Science and Engineering,Zhongshan University,Guangzhou 510275,China);Estimating Brooks-Corey model parameters based on soil water infiltration data under two kinds of negative water pressures[J];Transactions of the Chinese Society of Agricultural Engineering;2006-08
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