集成土壤-环境关系与机器学习的干旱区土壤属性数字制图

张振华,丁建丽,王敬哲,葛翔宇,王瑾杰,田美玲,赵启东

Digital Soil Properties Mapping by Ensembling Soil-Environment Relationship and Machine Learning in Arid Regions

ZhenHua ZHANG,JianLi DING,JingZhe WANG,XiangYu GE,JinJie WANG,MeiLing TIAN,QiDong ZHAO

表1 数字土壤制图环境协变量

Table 1 Environmental covariates of digital soil mapping

编号 Number 数据来源 Data source 协变量定义 Covariable definition 简称 Abbreviation 计算公式 Formula 参考文献 Reference 1 DEM 高程 Elevation Ele [23] 2 坡度 Slope Slo [23] 3 坡向 Aspect Asp [23] 4 曲率 Curvature Cur [23] 5 剖面曲率 Profile curvature PrCu [23] 6 平面曲率 Plan curvature PlCu [23] 7 地形湿度指数 Topographic wetness index TWI ln（α/tanβ) [23] 8 Landsat 8 OLI / TIRS 海岸波段 band 1 coastal b1 9 蓝波段 Band 2 blue b2 10 绿波段 Band 3 green b3 11 红波段 Band 4 Red b4 12 近红外波段 Band 5 near infrared b5 13 短波红外1 Band 6 shortwave infrared 1 b6 14 短波红外2 Band 7 shortwave infrared 2 b7 15 增强型植被指数 Enhanced vegetation index EVI 2.5[(NIR-R)/(NIR+6×R-7.5×R+1)] [24] 16 差值植被指数 Difference vegetation index DVI NIR-R [9] 17 归一化植被指数 Normalized difference vegetation index NDVI (NIR-R)/(NIR+R) [9] 18 扩展增强型植被指数 Extended normalized difference vegetation index ENDVI (NIR+SWIR2 -R)/(NIR+SWIR2 +R) [25] 19 调整土壤亮度植被指数 Modified soil adjusted vegetation index MSAVI [2NIR+1-((2NIR+1)2-8(NIR-R))0.5]/2 [9] 20 强度指数1 Intensity index 1 Int1 (G+R)/2 [26] 21 强度指数2 Intensity index 2 Int2 (G+R+NIR)/2 [26] 22 盐分指数S1 Salinity index S1 S1 B/R [27] 23 盐分指数S3 Salinity index S3 S3 (G×R)/B [27] 24 盐分指数S5 Salinity index S5 S5 (B×R)/G [27] 25 盐分指数S6 Salinity index S6 S6 (R×NIR)/G [27] 26 盐分指数 Salinity index SI (B×R)0.5 [27] 27 盐分指数1 Salinity index 1 SI1 (G×R)0.5 [27] 28 盐分指数2 Salinity index 2 SI2 (G2 + R2 + NIR²)0.5 [27] 29 盐分指数3 Salinity index 3 SI3 (R2 + G2)0.5 [27] 30 归一化盐分指数 Normalized difference salinity index NDSI (R-NIR)/(R+NIR) [27] 31 综合光谱响应指数 Combined spectral response index CoSRI (B+G)/(R+NIR)×NDVI [28] 32 地表温度 Land surface temperature LST [16]