Geographic Weighted Regression Model Combined with Remote Sensing for Estimating Forest Aboveground Carbon Storage of Songyang County

doi:10.13466/j.cnki.lyzygl.2023.04.016

Abstract

Abstract:

Aboveground carbon(AGC)is an important indicator of the basic characteristics of forest ecosystems and a theoretical basis for evaluating the functional structure and productive potential of forests.As one of the nine key forestry counties in Zhejiang Province,Songyang County has a very important ecological status,so the accurate estimation of forest AGC in Songyang County is an important reference value for the stability evaluation of forest ecosystems and forest management in Songyang County.However,Songyang County is dominated by medium and low hilly areas surrounded by mountains,and how to consider the influence of complex terrain on the temporal and spatial variation of AGC is an urgent problem to be solved to achieve accurate estimation of AGC in mountainous forests.Therefore,based on Landsat TM satellite imagery and forest AGC survey data in Songyang County,a geographically weighted regression model(GWR)combined with spatial variation characteristics was constructed to estimate forest AGC,and compared with the results of ordinary least squares(OLS),finally,the optimal model was selected to predict forest AGC and its spatial distribution in Songyang County.The results were asfollows:Texture information from Landsat TM satellite imagerywas important for predicting forest AGC in Songyang County;The GWR model accurately estimated the AGC and spatial distribution of forests in Songyang County,and improved the accuracy by 9% over the OLS model,with an R² of 0.71.The total AGC of forests in Songyang County was 3.901×10⁶ Mg,with an average AGC of 23.70 Mg/hm²,accounting for about 10% of the total AGC of forest vegetation in Lishui City,which had a relatively important position in serving regional ecological functions.The study will provide advanced technical tools for accurate estimation of forest AGC in Songyang County,as well as scientific data for evaluating the function of forest carbon sink in Songyang County.

Key words: forest aboveground carbon storage, remote sensing, geographic weighted regression, model, Songyang County

CLC Number:

S771.8

ZOU Weimin, CHEN Chao, HUANG Lei, SONG Meixuan, LI Xuejian, DU Huaqiang. Geographic Weighted Regression Model Combined with Remote Sensing for Estimating Forest Aboveground Carbon Storage of Songyang County[J]. FOREST RESOURCES WANAGEMENT, 2023, (4): 132-140.

Figures/Tables 8

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遥感变量类型	遥感变量因子	参考文献
原始波段	蓝光波段(B)、绿光波段(G)、红光波段(R)、近红外波段(NIR)、短波红外1波段(SWIR 1)、短波红外2波段(SWIR 2)
植被指数	归一化植被指数(Normalized Difference Vegetation Index,NDVI)、增强植被指数(Enhanced Vegetation Index,EVI)、比值植被指数(Ratio Vegetation Index,RVI)、差值植被指数(Difference Vegetable Index,DVI)、归一化水指数(Normalized Difference Water Index,NDWI)、归一化红外指数(Normalized Difference Infrared Index,NDII)	[20?-22]
纹理特征	对比度(Contrast,CON)、相关性(Correlation,COR)、相异性(Dissimilarity,DIS)、熵(Entropy,ENT)、方差(Variance,VAR)、均质性(Homogeneity,HOM)	[23]