摘要
土壤水分是监测作物旱情的基本因子,以欧空局1978~2014年微波遥感土壤水分产品、中国经济与社会发展统计数据库以及气象数据为基础,结合土壤水分亏缺指数(Soil Water Deficit Index,SWDI)分析东北地区的干旱程度与玉米亩产的关系。结果表明:①东北三省干旱程度空间上呈现自东北向西南逐渐加重的空间分布模式;②基于CCI(Climate Change Initiative)土壤水分产品计算的SWDI干旱指数与降雨量和气温有良好的相关关系,可用于评估干旱发生的严重程度;③玉米生长季关键需水期——7月的SWDI与玉米产量的相关性最好,二者在黑龙江、吉林和辽宁省的R2分别为0.43、0.78和0.38,非常适合用于评估干旱对玉米单产的影响。该结论对于研究大范围土壤水分含量对农作物产量的影响以及相关农业决策具有重要指导意义。
Soil moisture is the basic factor for monitoring crop drought.Based on the microwave remote sensing soil moisture products of ESA from 1978 to 2014,the statistical database of China's economic and social development and meteorological data,combined with the Soil Moisture Deficit Index(SWDI),the relationship between the degree of drought in Northeast China and corn yield was analyzed.The results show that:(1)the drought level of the three provinces is increasing from northeast to southwest;(2)the SWDI drought index calculated based on CCI(Climate Change Initiative)soil moisture products has a good correlation with rainfall and temperature,which can be used to evaluate the severity of drought;(3)the correlation between SWDI and maize yield is the best in the key water demand period(July),and R^2of Heilongjiang,Jilin and Liaoning provinces are 0.43,0.78 and 0.38 respectively,which is very suitable for quantifying the effect of drought on maize yield.This conclusion has important guiding significance for the study of the influence of soil moisture content on crop yield and the relevant agricultural decision-making.
作者
李雷
郑兴明
赵凯
李晓峰
王广蕊
Li Lei;Zheng Xingming;Zhao Kai;Li Xiaofeng;Wang Guangrui(Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China;University of Chinese Academy of Sciences,Beijing 100049,China;Changchun Jingyuetan Remote Sensing Test Site of Chinese Academy of Sciences,Changchun 130102,China)
出处
《遥感技术与应用》
CSCD
北大核心
2020年第1期111-119,共9页
Remote Sensing Technology and Application
基金
吉林科技发展计划优秀青年人才工程项目(20170520078JH)
国家自然科学基金面上项目(41971323)。
关键词
微波遥感
土壤水分
干旱指数
玉米产量
东北地区
Microwave remote sensing
Soil moisture
Drought index
Corn yield
Northeast China
作者简介
李雷(1991-),男,河北定州人,博士研究生,主要从事土壤水分、定量遥感研究。E-mail:lilei@iga.ac.cn;通讯作者:郑兴明(1984-),男,四川中江人,副研究员,主要从事微波遥感、土壤水分反演算法研究。E-mail:zhengxingming@iga.ac.cn。
