基于遥感的黑河中游绿洲区玉米物候及其动态研究

Study on Maize Phenology and Dynamics in Oasis Region of the Middle Heihe River Based on Remote Sensing

基于Savitzky-Golay滤波,利用相对阈值法和绝对阈值法,分析2001—2016年黑河中游绿洲区玉米的物候信息,对玉米的生长季开始日期、生长季结束日期和生长季长度3个物候参数开展分析。结果表明,相对阈值法与绝对阈值法相比,判断结果更加准确;2001—2016年的玉米生长季开始日期大约推迟14 d,生长季结束日期大约提前5 d,生长季长度大约缩短20 d;玉米生长季长度与生长季内积温呈负相关,随着积温的增加,生长季长度越来越短。

Based on Savitzky-Gl-olay filtering ,this paper analyzed the phenological information of com in the middle oasis of Heihe River from2001 to 2016 by using relative threshold method and absolute threshold method. Three phenology parameters such as cor growing season stardate, growing season end date and growing season length were analyzed. The results showed that the relative threshold method was more accu-rate than the absolute threshold method. The start date of the cor growing season from 2001 to 2016 was growing season was about 5 days earlier. The length of the growing season was shortened by about 20 days. The length of the growing season was mainly negatively correlated by the accumulated temperature in the growing season. As the accumulated temperature increased,the length of the growing season became shorter and shorter.