摘要
利用棉花主要生育时期的无人机近红外影像数据,提取4种不同的植被指数,通过与棉花地上生物量的实测值建立拟合关系,分析了不同植被指数在棉花各生育时期的估算效果并对其进行了验证。结果表明,随棉花生长,归一化植被指数(NDVI)、宽动态植被指数(WDRVI)、比值植被指数(RVI)和差值植被指数(DVI)均从苗期开始显著增加,其后则表现为基本稳定的“饱和”现象,但棉花实测生物量在不同生育期均有显著差异。植被指数与棉花实测生物量的拟合结果显示:NDVI和DVI的二元线性拟合模型对苗期生物量拟合效果最佳(R 2=0.84,RMSE=0.13 kg·m^-2);WDRVI和DVI的二元线性拟合模型对花蕾期生物量拟合效果最佳(R 2=0.87,RMSE=0.52 kg·m^-2);RVI的非线性拟合模型对花铃期生物量拟合效果最佳(R 2=0.79,RMSE=0.95 kg·m^-2);WDRVI和RVI的二元线性拟合模型对盛铃期生物量的拟合效果最佳(R 2=0.86,RMSE=0.96 kg·m^-2)。
Using near-infrared image data collected by Unmanned Aerial Vehicle(UAV)during the main growth period of cotton,four different vegetation indices were extracted to construct optimal estimation model with above-ground biomass(AGB).The results showed that,with growth of cotton,Normalized Difference Vegetation Index(NDVI),Wide Dynamic Range Vegetation Index(WDRVI),Ratio Vegetation Index(RVI),and Difference Vegetation Index(DVI)all increased firstly and then stayed constant.However,AGB of cotton varied significantly among all growth periods.AGB at seedling period was best fitted by binary linear model between NDVI and DVI(R 2=0.84,RMSE=0.13 kg·m^-2),while AGB at bud period was best fitted by binary linear model between WDRVI and DVI(R 2=0.87,RMSE=0.52 kg·m^-2).At blooming period,AGB was best predicted by nonlinear model of RVI(R 2=0.79,RMSE=0.95 kg·m^-2).At boll period,AGB was best estimated by binary linear model between WDRVI and RVI(R 2=0.86,RMSE=0.96 kg·m^-2).
作者
邓江
谷海斌
王泽
盛建东
马煜成
信会男
DENG Jiang;GU Hai-bin;WANG Ze;SHENG Jian-dong;MA Yu-cheng;XIN Hui-nan(Xinjiang Key Laboratory of Soil and Plant Ecological Processes,College of Grassland and Environmental Sciences,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China)
出处
《干旱地区农业研究》
CSCD
北大核心
2019年第5期55-61,69,共8页
Agricultural Research in the Arid Areas
基金
国家自然科学基金项目(3156340)
“天山创新团队计划”—土壤保育与节水减肥创新团队
新疆维吾尔自治区科技支疆项目计划(2016E02083)
关键词
棉花
无人机遥感
地上部生物量
植被指数
cotton
UAV remote sensing
above-ground biomass
vegetation index
