A studying on variation law of soil moisture and relationship between soil moisture and output of wheat at Tianshui Gansu in arid region
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DOI：10.7606/j.issn.1000-7601.2008.03.05
Key Words: soil moisture  variation  wheat  yield  Tianshui
Author NameAffiliation
LIU Weimin Lanzhou Institute of Arid Meteorology Key and Open Laboratory of Arid Climate Change and Reducing Disaster China Meteorological Administration Key Laboratory of Arid climate Change and Reducing Disaster of Gansu Province， Lanzhou， Gansu 730020，China；Tianshui Meteorology Bureau, Tianshui, Gansu 741000, China 
PU Jingyong Agrometeorological Experiment Station of Tianshui， Tianshui， Gansu 741020， China 
YAO Xiaohong Agrometeorological Experiment Station of Tianshui， Tianshui， Gansu 741020， China 
YUAN Baishun Tianshui Meteorology Bureau, Tianshui, Gansu 741000, China 
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Abstract:
      Based on the data of wheat yield and soil moisture which were measured in the test field of the Agrometeorological Experiment Station of Tianshui （1980～2005）?the laws of soil water movement and it’s variation and the effects on the output of wheat were analyzed and the quantity commentary of impact of soil water on the yield of wheat was made in different periods．The results showed that soil water content appeared to be parabole and it’s minimum value appeared in the middle ten days of June?accumulated consumption water turned to be Logsiter curve?the yield of wheat was seriously influenced by soil water content during the growth periods from the beginning of growing stage to spike formation stage．It also showed that soil water （0～100 cm） increased by10mm with the yield of wheat increasing by180kg／hm2 in April to May．
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