Comparison of three remotely sensed drought indices for assessing the impact of drought on winter wheat yield
Comparison of three remotely sensed drought indices for assessing the impact of drought on winter wheat yield
复制标题
三种遥感干旱指数比较评估干旱对冬小麦产量的影响
DOI：
10.1080/17538947.2018.1542040
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发表时间：
2020-04-02
影响因子：
5.1
通讯作者：
Zhang, Xiaodong
中科院分区：
文献类型：
--
作者：
Huang, Jianxi;Zhuo, Wen;Zhang, Xiaodong
农业干旱威胁着粮食安全。已经开发了许多遥感干旱指数，但它们的原理、假设和物理量不同，因此有必要比较它们对大面积干旱监测的适用性。本文分析了中国北方两个主要农业产区（分别以雨养农业和灌溉农业为主）的植被健康指数（VHI）、温度植被干燥指数（TVDI）和干旱严重程度指数（DSI） 3个典型遥感干旱监测指标的表现。将这些指标与标准化降水指数（SPI）、土壤水分、冬小麦产量和国家气象干旱监测（NMDM）图的一致性进行了比较。平均而言，DSI优于其他指标，与SPI和土壤湿度的相关性更强。DSI与土壤湿度和NMDM图的对应关系也较好。冬小麦拔节期和灌浆期对水分胁迫更为敏感，说明这两个时期冬小麦对水分的需要量较大。此外，干旱指数与SPI、土壤湿度和冬小麦产量的相关性在陕西省总体上强于河南省，表明遥感干旱指数能够更准确地预测旱作为主农业区的干旱影响。
ABSTRACT Agricultural drought threatens food security. Numerous remote-sensing drought indices have been developed, but their different principles, assumptions and physical quantities make it necessary to compare their suitability for drought monitoring over large areas. Here, we analyzed the performance of three typical remote sensing-based drought indices for monitoring agricultural drought in two major agricultural production regions in Shaanxi and Henan provinces, northern China (predominantly rain-fed and irrigated agriculture, respectively): vegetation health index (VHI), temperature vegetation dryness index (TVDI) and drought severity index (DSI). We compared the agreement between these indices and the standardized precipitation index (SPI), soil moisture, winter wheat yield and National Meteorological Drought Monitoring (NMDM) maps. On average, DSI outperformed the other indices, with stronger correlations with SPI and soil moisture. DSI also corresponded better with soil moisture and NMDM maps. The jointing and grain-filling stages of winter wheat are more sensitive to water stress, indicating that winter wheat required more water during these stages. Moreover, the correlations between the drought indices and SPI, soil moisture, and winter wheat yield were generally stronger in Shaanxi province than in Henan province, suggesting that remote-sensing drought indices provide more accurate predictions of the impacts of drought in predominantly rain-fed agricultural areas.