基于ENDVI-SI3特征空间的盐渍化反演模型及风险评估

张思源, 岳楚, 袁国礼, 袁帅, 庞文强, 李俊

Salinization inversion model based on ENDVI-SI3 characteristic space and risk assessment

ZHANG Siyuan, YUE Chu, YUAN Guoli, YUAN Shuai, PANG Wenqiang, LI Jun

表3 盐渍化风险评估因子相关性筛选及赋权

Tab.3 Correlation screening and weighting of salinization risk assessment factors

变量 相关系 数r 显著水 平P 样本 数 灰色关 联度 γ 权重 w 镁离子/(g·kg-1) 0.836 <0.001 66 0.909 0.126 含盐量/(g·kg-1) 0.820 <0.001 66 0.917 0.127 氯离子/(g·kg-1) 0.772 <0.001 66 0.897 0.124 钠离子/(g·kg-1) 0.752 <0.001 66 0.884 0.123 硫酸根/(g·kg-1) 0.635 <0.001 66 0.833 0.115 钙离子/(g·kg-1) 0.524 <0.001 66 0.949 0.132 有机质/(g·kg-1) -0.327 0.007 66 0.924 0.128 有效磷/(mg·kg-1) 0.289 0.019 66 0.900 0.125 钾离子/(g·kg-1) 0.228 0.065 66 0.949 — pH 0.212 0.087 66 0.958 — 全氮/(g·kg-1) -0.203 0.103 66 0.927 — 容重/(g·cm-3) -0.196 0.115 66 0.952 — 碳酸氢根/(g·kg-1) 0.061 0.629 66 0.939 —