A Modelling Stndy of Potential Evapotranspiration andthe Estimation of Chinese Soil Moistnre RegimesEnglish Full Text
LIU DUOSEN and WANG ZONGSHENG(Instttute of Soil Science, Academia Sinica, P. O. Box 821, Nanjing 210008(China))
Abstract: Based on the conception of fluid mechanics, the paper propounds a model for monthly potential evapo-transpiration ETi （mm）: where i is the number of a month, Pi the mean monthly atmospheric pressure （hpa）, ti the mean monthlyair temperature （° C）, di the number of days in the month, Ui the mean monthly wind velocity measured atheight 10-12 m （m/s）, woi the saturated water vapour pressure at ti（mmHg, 1 mmHg=133.322 Pa）, and hithe mean monthly relative humidity. The annual aridity K is:where ra is the mean annual precipitation （mm）. Based upon the data of 669 sites in China during 1951-1980, the relations among the soil moisture regime, the vegetation and the value of K may be illustrated asfollows:K Soil moisture regime VegetationK ＜ 1 Udic Forest Semi-udic Forest, forest-steppe and steppeSemi-aridic Arid steppe Aridic Desert-steppe Very aridic Desert
Keywords：
aridity; evapotranspiration; modelling; moisture regimesScience Foundation of China and the Academia Sinica.;
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S152
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