基于温度供水干旱指数的京津冀春旱监测及时空分布分析

为提高农业干旱监测效果和精度,在对传统干旱监测模型对比分析基础上,本文提出将温度植被干旱指数(TVDI)和植被供水指数(VSWI)加权联合构建温度供水干旱指数(TSWDI)的研究思路。以京津冀2006—2012年5月份数据作为实验统计数据,以京津冀2006—2016年3—5月份春旱监测为例进行了模型实验。实验结果证实,TSWDI指数相对其他两个指数与10、20和50 cm深处的土壤水分相关性更高,能够更精准地反映农业干旱状况。TSWDI计算结果显示,京津冀干旱分布具有如下特征:从时间角度看,2006—2016年整体干旱状况逐渐缓解,特别是自2010年至今,研究区域干旱程度逐步减轻;从空间角度看,京津冀区域整体干旱面积逐步减少。

Spring Drought Monitoring in Beijing-Tianjin-Hebei Based on Temperature Water Supply Drought Index

In order to improve the effectiveness and accuracy of agricultural drought monitoring,based on a comparative analysis of traditional drought monitoring models,a research idea is proposed to construct a temperature water supply drought index(TSWDI)by weighting the temperature vegetation drought index(TVDI)and vegetation water supply index(VSWI).Using Beijing-Tianjin-Hebei data from May 2006 to May 2012 as experimental statistical data,A model experiment was conducted using spring drought monitoring in Beijing-Tianjin-Hebei from March 2006 to May 2016.The experimental results confirm that the TSWDI index has a higher correlation with soil moisture at depths of 10、20and 50 cm than the other two indices,and can more accurately reflect agricultural drought conditions.The TSWDI calculation results show that the Beijing-Tianjin-Hebei drought distribution has the following characteristics:From a time perspective,from March to May(2006 to 2016 as a whole),the drought situation gradually eased,especially since 2010,the drought in the study area gradually reduced.From a spatial perspective,the overall dry area in the Beijing-Tianjin-Hebei region has gradually decreased.