2010•Anhui nongye kexueRequires access

Drought Change of the Winter Wheat in Tianjin Revealed by Soil Water Homeostasis

LI Zhen-fa

Abstract

Based on the meteorological data in Baodi District of Tianjin during 1959-2009,cumulated non-stress water deficit of the top one meter soil layer under no irrigation conditions was calculated by using soil water dynamic equilibrium equation.The drought change characteristics of this area were analyzed according to drought index.The results indicated that the occurrence reached 97% for drought at different levels in natural situation in growth season of winter wheat.Additionally,it was found that the occurrence of drought was the highest in spring.

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Key concepts: Environmental science, Irrigation, Spring (device), Hydrology (agriculture), Agronomy, Soil water, Drought stress, Growing season