摘要
为明晰江淮区域大田冬小麦赤霉病的发生特征,建立冬小麦赤霉病遥感估测模型,该文分析了冬小麦赤霉病病情指数与气候因素(不同时间尺度日均气温和日均空气相对湿度)、生长参数(生物量、叶面积指数和叶片叶绿素含量)和光谱信息(NDVI、RVI和DVI)之间的互作关系。结果表明:1)不同时间尺度日均气温之间存在较好相关性,5日均气温与冬小麦赤霉病病情指数间的相关系数最大为0.77。与日均气温相类似,不同时间尺度日均空气相对湿度之间也存在不同程度的相关性,5日均空气相对湿度与赤霉病病情指数间的相关性最大,其相关性高于5日均气温。2)冬小麦生物量、叶面积指数和叶片叶绿素含量与赤霉病病情指数之间均呈线性正相关关系,且均达到显著水平,说明冬小麦群体密度大、郁闭程度高以及长势过旺是赤霉病易发的主要农学诱因。3)遥感植被指数NDVI(normalized difference vegetation index)、RVI(ratio vegetation index)和DVI(difference vegetation index)分别与冬小麦叶面积指数、生物量和叶片叶绿素含量之间有较好相关性,可以利用NDVI、RVI和DVI分别替换叶面积指数、生物量和叶片叶绿素含量参与建模。4)综合5日均气温、5日均空气相对湿度、NDVI、RVI和DVI 5个敏感因子,构建基于温湿度与遥感植被指数的冬小麦赤霉病病情指数估测模型,模型的估测值与实测值较为一致,RMSE为5.3%,相对误差为9.54%。说明本研究所建立的估测模型可以实现对冬小麦始花期赤霉病的有效估测,该研究可为江淮区域冬小麦生产中防病减灾的信息获取提供方法参考。
Scab is one of the main diseases of winter wheat in Yangtze-Huaihe River region in China,whose monitoring and forecasting timely in large area will help to adjust the pesticide spraying measures reasonably and realize the purpose of reducing disaster and increasing yield.In this study,we carried out remote monitoring tests of winter wheat scab in4counties(Donghai,Lianshui,Taixing and Dafeng)of Jiangsu Province in Yangtze-Huaihe River region,analyzed the interaction and relationship between winter wheat scab characteristics,climatic factors,growth parameters and spectral information,selected major scab’s sensitive factors,and established the remote sensing estimation model of winter wheat scab disease index based on interactions between spectral information and climatic factors.The results showed that:1)There is a good correlation between the daily mean temperatures in different time scales,of which the correlation between the daily mean temperature of7days and the daily mean temperature of10days is the highest,and the correlation coefficient is0.9665.The correlation coefficient between the daily mean temperature of5days and the winter wheat scab disease index is the largest,which is0.7726,indicating that the daily average temperature of5days in different time scales has the most obvious effect on the occurrence of scab in winter wheat.2)Similar to the daily mean temperature,there are different degrees of correlation between the daily mean relative humidity at different time scales.The correlation coefficient is the largest between daily mean relative air humidity of7days and daily mean relative air humidity of10days,and its value is0.9337.The daily mean relative air humidity of5days has the highest correlation with winter wheat scab disease index,and its correlation coefficient is0.7842,higher than the daily mean temperature of5days,which shows that the daily mean relative air humidity of5days has a higher influence on winter wheat scab than the daily mean temperature of5days.3)There is a positive linear correl
作者
李卫国
黄文江
董莹莹
陈华
王晶晶
单婕
Li Weiguo;Huang Wenjiang;Dong Yingying;Chen Hua;Wang Jingjing;Shan Jie(Institute of Agricultural Information, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;Institute of remote sensing and digital earth, Chinese Academy of Sciences, Beijing 100094, China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2017年第23期203-210,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(41171336)
江苏省重点研究计划(BE2016730)
中科院数字地球重点实验室开放基金项目(2016LDE007)
关键词
病害
评估
温度
冬小麦赤霉病
光谱信息
相对湿度
生长参数
江淮区域
diseases
estimation
temperature
winter wheat scab
spectral information
relative humidity
growth parameters
Yangtze-Huaihe river region
