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| DOI： |
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| Spatial Distribution of Water Deficit of Winter Wheat in Different Growing Stages and Spatial Variation of Precipitation in Henan Province |
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BAI Fangfang, QIAO Dongmei, PANG Ying, LIU Chuncheng, LU Hongfei, ZHAO Yulong, CHEN Siying， WANG Hezhou
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Framland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; National Agro-ecological System Observation and Research Station of Shangqiu, Shangqiu 476000, China;Suiyang District Rural Work Committee Office of Shangqiu, Shangqiu 476000, China
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| Abstract: |
| We calculated water deficit of winter wheat in Henan province by dividing its growing stage into early growth stage, tillering-wintering stage, and turning green-heading-maturity stage. Using the CROPWAT model and meteorological data measured from 1951—2013 at 20 sites across the province, we calculated the effective precipitation, water consumption and water deficit of the wheat at different growing stages. The spatial distribution and variability of these factors were analyzed using ArcGIS 10.0, and the precipitation during different growing stages was analyzed using the Mann-Kendall non parametric rank correlation test. The results for different growing seasons can be summarized as follows. ①The effective precipitation decreased from southeast to northwest, the water consumption decreased from northwest to southeast except in the tillering-wintering stage, and the water deficit decreased from northwest to southeast. ②The average effective precipitation during whole growing stage, early growth stage, tillering-wintering stage and turning green-heading-maturity stage was 201.80 mm, 25.04 mm, 45.91 mm, 130.85 mm respectively, the associated average water consumptions were 432.52 mm, 39.23 mm,104.22 mm, 289.07 mm respectively, and the associated average crop water deficits were 230.72 mm, 14.19 mm, 58.31 mm, 158.22 mm respectively. The Mann-Kendall test results showed that the precipitation decreased in whole growing stage, increased in early growth stage, decreased in the tillering-wintering stage and the turning green-heading-maturity stage. The precipitation in different growth stages changed with UF. In summary, water at the turning green-heading-maturity stage is in deficit in north of the province including Anyang, Xinxiang, but sufficient in the south including Zhumadian and Xinyang. |
| Key words: winter wheat; effective precipitation; water consumption; crop water deficit; precipitation; different growth stages; Mann-Kendall |
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