中国生态农业学报2018，Vol.26Issue(4)：559-566,8.DOI:10.13930/j.cnki.cjea.170817
甘肃省冬小麦水分盈亏指数的改进及其应用
Improvement and applicability of winter wheat water budget index in Gansu Province
摘要
Abstract
Winter wheat is a major grain crop in Gansu Province, where precipitation is the most limiting factor for winter wheat production. The uneven space-time distribution of precipitation results in perennial winter wheat drought in Gansu Province. It is therefore practically important to accurately monitor drought and quantitatively evaluate disaster losses of win-ter wheat in Gansu Province. This can provide the needed scientific basis for decision-making departments to formulate agri-cultural disaster prevention and mitigation measures towards regional food security. In this study, we collected data on soil water content and winter wheat growth conditions in three agronomic observatory stations. Data were also collected on mete-orological conditions, yield and drought disaster in 38 winter wheat growing counties for the period 1981–2014. Based on soil water storage during fallow period and on water budget for winter wheat development stage, crop water budget index was revised. There was a high correlation among crop water budget index and soil water storage, yield factors and losses. Therefore, it objectively, accurately and quantitatively reflected the impact of drought on winter wheat yield in Gansu Province. A yield-factor assessment model and a yield-loss assessment model were developed in the study based on the revised water budget index. The results showed that while the yield-factor assessment model passed 0.01 test of significance, and much of the yield-loss assessment model passed 0.05 test of significance. The assed and measured values of winter wheat yield factors passed F-test (P < 0.01). The validation results of the yield loss assessment model showed that 68.4% of wheat growing coun-ties passed F-test (P < 0.05), which more accurately assessed the loss due to drought in Gansu Province. The revised crop water budget index objectively reflected the drought of winter wheat in Gansu Province and the established assessment model accurately estimated the loss due to drought, which provided a reliable reference for application.关键词
冬小麦/水分盈亏指数/干旱/土壤储水/产量要素/产量损失/评估模型Key words
Winter wheat/Water budget index/Drought/Soil water storage/Yield factor/Yield loss/Assessment model分类
农业科技引用本文复制引用
贾建英,韩兰英,万信..甘肃省冬小麦水分盈亏指数的改进及其应用[J].中国生态农业学报,2018,26(4):559-566,8.基金项目
国家自然科学基金项目(41605090)、国家公益性行业(气象)科研专项(GYHY201506016)、甘肃省气象局面上项目(2015-14)和甘肃省气象局青年优秀科技人才专项资助 This study was supported by the National Natural Foundation of China (41605090), the Special Found for Meteo-scientific Research in the Public Interest of China (GYHY201506016), the Surface Project of Gansu Meteorology Bureau (2015-14) and the Youth Technology Talent Project of Gansu Meteorology Bureau. （41605090）
