桂北桉树人工林红壤速效钾含量高光谱反演模型研究  

Hyperspectral Inversion Model of Available Potassium Content in Red Soil of Eucalyptus Plantation in Northern Guangxi

作　　者：赵隽宇 石媛媛[1,2] 覃祚玉 潘波[1,2] 黄小芮 唐健[1,2] ZHAO Juan-yu;SHI Yuan-yuan;QIN Zuo-yu(Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning,Guangxi 530002;Guangxi Research and Development Center for New Forestry Fertilizer,Nanning,Guangxi 530002)

机构地区：[1]广西壮族自治区林业科学研究院,广西南宁530002 [2]广西林用新型肥料研发中心,广西南宁530002 [3]国有七坡林场,广西南宁530225

出　　处：《安徽农业科学》2021年第21期154-156,192,共4页Journal of Anhui Agricultural Sciences

基　　金：广西优良用材林资源培育重点实验室自主课题资助项目(2020-A-04-01);广西创新驱动发展专项资金项目课题(桂科AA17204087-11)。

摘　　要：以桂北桉树人工林红壤为研究对象,测定了不同土壤速效钾含量样品的光谱数据,分析其光谱特征,采用PLS法建立反演模型。结果表明:该区域红壤速效钾含量的光谱敏感波段集中于400~600、1450、2200 nm等区域。经过一阶导数变换后,能显著减少原始光谱数据中的冗余信息,提高光谱指标与土壤速效钾含量之间的相关性。R、FDR 2种光谱指标的全波段建模结果均优于显著性波段的建模结果,最优模型为全波段-FDR-PLS,模型R^(2)=0.862,RMSE=2.718。该研究结果可为广西土壤数字制图、精准变量施肥以及土壤速效钾实时监测等近地遥感推广应用服务。Taking red soil of eucalyptus plantation in northern Guangxi as the research object,the spectral data of different soil available potassium content samples were measured,the spectral characteristics were analyzed,and the inversion model was established by using PLS method.The results showed that the spectral sensitive bands of available potassium content mainly concentrated in the region of 400-600,1450,2200 nm and so on.After the first derivative transformation,the redundant information in the original spectral data can be significantly reduced,and the correlation between spectral indexes and soil available potassium content can be improved.The full-band modeling results of R and FDR were better than those of significant bands.The optimal model was full-band FDR-PLS,R^(2)=0.862 and RMSE=2.718.The results can be used for the application of near-ground remote sensing in Guangxi,such as soil digital mapping,precise variable fertilization and real-time monitoring of soil available potassium.

关 键 词：可见-近红外光谱 近地遥感 线性模型 人工林 土壤信息 

分 类 号：S714.8[农业科学—林学]