论文部分内容阅读
黄淮海平原降水较少且年际、季际变化大，因此水分供应状况成为该区作物，特别是以冬春季为主要生育期的冬小麦的主限制因素。鉴于作物实际蒸散量与潜在蒸散量关系依赖于作物生长状况和土壤水分的事实，提出反映作物缺水状况的干旱指标———作物水分胁迫指数（ＣＷＳＩ）。计算黄淮海平原冬小麦生长期间的ＣＷＳＩ，并分析其在自然降水条件及适量灌溉条件下的时空分异规律
The precipitation in the Huang-Huai-Hai Plain is less and the interannual and inter-annual variations are large. Therefore, the water supply status has become the main limiting factor for the crops in this area, especially in winter and spring as the main growth period. In view of the fact that the relationship between actual evapotranspiration and potential evapotranspiration is dependent on crop growth status and soil moisture, a drought index (CWSI) reflecting the water deficit status of crops is proposed. The CWSI during the growth of winter wheat in Huang-Huai-Hai Plain was calculated and its spatial-temporal differentiation pattern under natural rainfall and moderate irrigation was analyzed