基于近红外波段玉米叶绿素含量最佳预测模型研究  

Optimum Prediction Model of Maize Leaf Chlorophyll Content Based on Near-infrared Band

作　　者：武倩雯 熊黑钢[1,2] 王莉锋[1] 靳彦华[1] 王凯龙[1] 

机构地区：[1]新疆大学资源与环境科学学院/教育部绿洲生态重点实验室,乌鲁木齐830046 [2]北京联合大学应用文理学院城市系,北京100083

出　　处：《中国农学通报》2015年第15期260-264,共5页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金"新疆天山北坡人类活动影响下绿洲水盐耦合关系与环境效应"(41171165);北京市属高等学校高层次人才引进与培养计划项目(IDHT20130322);北京联合大学人才强校计划资助项目(BPHR2012E01)

摘　　要：为了进一步探究近红外波段玉米光谱反射率与其叶绿素含量之间的关系,笔者采用线性和非线性法对玉米叶绿素含量与近红外波段光谱反射率及植被指数之间的关系进行分析,建立叶绿素含量最佳预测模型。结果表明:在近红外波段,光谱反射率与玉米叶绿素含量的相关性较大;叶绿素含量与RVI(R1001/R760)、RSI(R765/R720)、NDVI(R990-R760)/(R760+R990)、NDSI(R813-R763)/(R813+R763)、CCI(D794/D763)等植被指数均达极显著相关,其中与NDVI的相关性最大,为0.91。基于近红外波段的植被指数建立玉米叶绿素含量预测模型中,采用RVI、RSI、NDVI、NDSI所建的二次多项式模型其决定系数R2均高达0.75以上。采用990、760 nm处的归一化植被指数NDVI建立的二次多项式为玉米叶绿素含量最佳预测模型,其具有最大决定系数(R2=0.855),较小RMSE(2.433)和RE%(0.61%),为利用高光谱信息反映玉米生长状况的叶绿素信息提供了基础。In order to further explore the relationship between near-infrared band reflectance of maize and its chlorophyll content, the author analyzed the relationship between chlorophyll content of maize and near- infrared band reflectance and vegetation index by linear and non-linear methods to establish the optimum chlorophyll content prediction model. The results showed that the correlation spectral reflectance and chlorophyll content was great at near-infrared band; chlorophyll content had highly significant correlation with RVI （R1001/R760）, RSI （R76/R720）, NDVI （R990-R760）l（R760＋R990）, NDSI （R813-R763）/（R813＋R763）, CCI （D794/D763） and so on, and NDVI had the biggest correlation index （0.91）. Determination coefficient R2 of all quadratic polynomial adopted RVI, RSI,NDVI, NDSI reached 0.75 in the maize chlorophyll content prediction model based on near- infrared band vegetation index. The quadratic polynomial which based on NDVI at 990, 760 nm was the optimum maize chlorophyll content prediction model, it had the biggest determination coefficient （R2=0.855） and lesser RMSE （2.433） and RE% （0.61%）. All those results could offer basis for using spectral information to reflect chlorophyll content in maize growth condition.

关 键 词：玉米 叶绿素含量 近红外波段 

分 类 号：S513[农业科学—作物学]