基于MODIS数据的农业干旱遥感指数对比和应用

发布时间：2018-01-22 05:55

本文关键词： 干旱遥感监测表观热惯量距平植被指数植被供水指数　出处：《国土资源遥感》2017年02期 　论文类型：期刊论文

【摘要】：以辽西北为研究区域,选取典型干旱年2009年作物(春玉米)主要生长季,采用表观热惯量(apparent thermal inertia,ATI)、距平植被指数(anomalies of vegetation index,AVI)和植被供水指数(vegetation supply water index,VSWI)3种基于不同理论的遥感干旱指数方法对土壤水分进行反演,分析其监测效果。结果表明,3种指数分别在一定程度上反映出了辽西北地区2009年的旱情趋势,但得到的反演结果并不一致;ATI在中高植被覆盖率下的监测效果高于预期结果,比较符合历史气象资料;AVI可以有效反映当年作物主要生长季各时期相对的受旱状况;VSWI夸大了植被的影响作用,存在严重的滞后性。
[Abstract]:Taking northwest Liaoning as the research area, the main growing season of crop (spring maize) in 2009 in typical dry year was selected, and the apparent thermal inertia (thermal inertia) was adopted. Ati, anomalous vegetation index, anomalies of vegetation index. AVI) and vegetative supply water index. Soil moisture was inversed by remote sensing drought index method based on different theories of VSWI)3 and its monitoring effect was analyzed. To some extent, the three indices reflect the trend of drought in 2009 in northwest Liaoning, but the inversion results are not consistent. The monitoring effect of ATI in the middle and high vegetation coverage was higher than the expected results, which was in line with the historical meteorological data. AVI can effectively reflect the drought condition in the main growing seasons of the current year. VSWI exaggerates the influence of vegetation and has serious lag.
【作者单位】：中国气象科学研究院生态环境与农业气象研究所;辽宁师范大学城市与环境学院;
【基金】：公益性行业(气象)科研专项项目“玉米干旱致灾临界气象条件及其监测预警技术”(编号:GYHY201506019)资助
【分类号】：S423;TP79
【正文快照】： 0引言辽宁省西北部的丘陵山地区,干旱少雨,素有“十年九旱”之称,是辽宁省的重点干旱区。特别是近十几a来,干旱频发,给当地国民经济特别是农业生产以及生态环境等造成了很多不利的影响。因此,如何有效地监测旱情成为该地区所面临的重要问题。目前常用于农业干旱监测的遥感干旱

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