龙口市污水灌区与清水灌区冬小麦植被指数变化差异分析

Difference of Winter Wheat Vegetation Index between Sewage Irrigation and Clean Water Irrigation Area of Longkou City

为了研究污水灌溉对农田土壤环境和作物生长的影响,利用2008—2009年10期中国环境与灾害监测预报小卫星(HJ-1A)CCD1影像数据,结合龙口市冬小麦物候期的变化特征提取出单一冬小麦种植区,反演了冬小麦生长期内的归一化植被指数(NDVI),并对污水灌区和清水灌区的冬小麦植被指数进行比对分析,最后结合相应的重归一化植被指数(RDVI)和叶面积指数(LAI)进行验证。结果显示,研究区内污水灌溉已经对灌区的作物生长产生了一定的影响,污水灌溉区作物的生长状况明显不及清水灌溉区作物长势。说明污水灌溉会导致冬小麦的长势变差,对污水排放的控制和污水无污化处理势在必行。

In order to study the influences of sewage irrigation on soil environment and crop growth, with the help of ten （ Hi-1 A） image data of Environment and Disasters Monitoring Microsatellite from 2008 to 2009, the paper has extracted the single planting area of winter wheat in combination with variation feature during phonological phase of Longkou winter wheat. The normalized difference vegetation index （NDVI） of winter wheat during its growth period was inversed. Comparing and analyzing the winter wheat vegetation index of sewage effluent irrigation and clean water irrigation area. At last, testing and verifying the results with the corresponding RDVI and LAI. The results showed that sewage irrigation has produced a certain influence on the growth of irrigated crops, the growth of crops irrigated with sewage situation is significantly worse than that irrigated with clean water situation. Indicating that sewage irrigation will lead to deterioration of winter wheat growth, and the work of sewage treatment and sewage pollution-free is imperative.