VIS-NIR spectroscopy and environmental factors coupled with PLSR models to predict soil organic carbon and nitrogen  

作　　者：Jingrong Zhu Yihua Jin Weihong Zhu Dong Kun Lee 

机构地区：[1]College of Agriculture,Yanbian University,Jilin,China [2]College of Geography and Ocean Sciences,Yanbian University,Jilin,China [3]Jilin Provincial Key Laboratory of Wetland Ecological Functions and Ecological Security,Hunchun,China [4]Department of Landscape Architecture and Rural System Engineering,Seoul National University,Seoul,South Korea

出　　处：《International Soil and Water Conservation Research》2024年第4期844-854,共11页国际水土保持研究(英文)

基　　金：supported by The National Natural Science Foundation of China(No.41830643);The National Science and Technology Basic Resources Survey Project(No.2019FY101703);The Higher Education Discipline Innovation Project(D18012)。

摘　　要：Soil profile organic carbon(OC)and total nitrogen(TN)are influenced by topographic attributes,and land use.The visible and near-infrared(Vis-NIR)spectroscopy method can be used for the prediction of OC and TN because it is reliable,nondestructive,fast,and cost-effective.VIS-NIR soil spectral and environmental data were combined with the Partial least squares regression(PLSR)model to examine the effect of topography attributes and land use on topsoil and subsoil OC and TN stocks.After this,based on the soil depth,114 soil samples were collected from 0 to 20 cm(topsoil)and 20-50 cm(subsoil)under three land uses,as well as OC and TN,along with several soil properties including soil particles(sand,silt,clay),pH,and bulk density in both topsoil and subsoil samples were measured.A DEM with a resolution of 30 m was used to derive the topography factors and remote sensing data was used to calculate the vegetation index.Soils(0-50 cm)under orchard land use had the highest stock of SOC(7.4 kg m^(-2))as well as TN(2.4 kg m^(-2)).There was a significant increase in the organic matter stock of soils located on the south aspect(8.3 kg m^(-2))compared to soils located on other aspects,particularly on the north aspect(3.9%increase).Soils on the south aspect contain higher soil-water contents and lower temperatures,resulting in a decrease in the decomposition of soil organic matter.A strong positive correlation was demonstrated between topography wetness index(0.57-0.63)and topography TN stocks(0.54-0.66)as well as the highest loading score among terrain attributes,suggesting that topography is the primary factor controlling SOC stocks,particularly subsoil stocks.Additionally,we found that soils on the southfacing aspects(N aspects)had the highest spectra.Additionally,the PLSR,which showed an R^(2) of 0.82,a RMSE of 0.15%,and a RPD of 0.39 indicated excellent prediction capabilities for the OC content.We concluded that the PLSR model coupled with Vis-NIR spectroscopy is able to predict topsoil and subsoil OC and N content under d

关 键 词：DEM NDVI SPECTRA PLSR TWI 

分 类 号：S15[农业科学—土壤学]