不同氮水平下冬小麦农学参数与光谱植被指数的相关性  

Correlation between agronomic parameters and spectral vegetation index in winter wheat under different nitrogen levels

作　　者：代辉[1] 胡春胜[1] 程一松[1] 宋文冲[1] 

机构地区：[1]中国科学院石家庄农业现代化研究所

出　　处：《干旱地区农业研究》2005年第4期16-21,共6页Agricultural Research in the Arid Areas

基　　金：973项目专题(G2000077905-04);中科院野外台站研究基金项目"基于Greenseeker技术的小麦-玉米氮素实时诊断和精准施肥研究"

摘　　要：利用光谱仪通过大田试验测量不同氮素水平及不同生育期冬小麦冠层的光谱反射率,测算叶面积指数(LAI)、叶绿素含量(CHL)、叶绿素密度(CHL.D)、地上鲜生物量和地上干生物量等农学参数;在此基础上分析了不同氮素水平冬小麦生育期内的光谱植被指数的变化,并分析了农学参数与植被指数之间的相关性。结果表明:小麦叶面积指数、叶绿素密度与比值植被指数(RVI)和归一化差值植被指数(NDVI)在各生育期呈显著相关,小麦叶片的叶绿素含量与RVI、NDVI在抽穗期呈极显著相关,而地上鲜生物量、地上干生物量与RVI和NDVI从起身到孕穗期呈显著相关。The spectral reflectance of winter wheat canopy under different nitrogen levels and at different periods was measured by using the spectrometer Field Spec to evaluate the agronomic parameters including leaf area index (LAI), chlorophyll content (CHL), chlorophyll density (CHL.D), fresh overground weight and dry overground weight. Furthermore, the variation of spectral vegetation index of winter wheat under different nitrogen levels and the correlation between agronomic parameters and spectral variables were analyzed. The results showed that LAI and chlorophyll density were strongly correlated with ratio vegetation index (RVI) and normalized difference vegetation index (NDVI), chlorophyll content was significantly correlated with RVI and NDVI at heading period (P<0.01), while fresh overground weight and dry overground weight were strongly correlated with RVI and NDVI during rising to booting period. These results may provide references for predicting the agronomic parameters by using the spectral vegetation index.

关 键 词：冬小麦 植被指数 叶面积指数 叶绿素含量 生物量 冠层 

分 类 号：S143.1[农业科学—肥料学] S512.1[农业科学—农业基础科学]