基于多光谱遥感的盐渍化评价指数对宁夏银北灌区土壤盐度预测的适用性分析

吴霞, 王长军, 樊丽琴, 李磊

An applicability analysis of salinization evaluation index based on multispectral remote sensing to soil salinity prediction in Yinbei irrigation area of Ningxia

WU Xia, WANG Zhangjun, FAN Liqin, LI Lei

表6 盐渍化评价指数与土壤EC之间的曲线拟合结果(中重度盐渍化)

Tab.6 Curve fitting results between salinization evaluation index and soil EC(Moderate and severe salinization)

模型 S1 S2 S3 S5 S6 SI SI1 R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) 线性函数 0.578 0.767 0.604 0.744 对数函数 0.610 1.881 逆模型 0.638 0.711 二次函数 0.722 0.623 0.717 0.628 三次函数 0.724 0.621 0.711 0.635 复合函数 0.664 0.949 0.692 0.921 0.463 0.983 0.507 0.939 0.493 0.984 0.523 0.931 0.502 0.934 幂函数 0.699 0.913 0.528 0.895 0.508 0.913 0.501 0.902 0.523 0.931 0.491 0.913 模型 S1 S2 S3 S5 S6 SI SI1 R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) S函数 0.730 0.872 0.498 1.063 0.463 0.925 0.476 0.912 增长函数 0.664 0.949 0.692 0.921 0.463 0.983 0.507 0.939 0.493 0.984 0.523 0.931 0.502 0.934 指数函数 0.664 0.949 0.692 0.921 0.463 0.983 0.508 0.939 0.493 0.984 0.523 0.931 0.502 0.934 逻辑函数 0.664 0.949 0.692 0.921 0.463 0.983 0.507 0.939 0.493 0.984 0.523 0.931 0.502 0.934 模型 SI2 SI3 Int1 Int2 EEVI CRSI R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) R2 RMSE/ (mS·cm-1) 线性函数 0.580 0.766 对数函数 0.553 3.000 逆模型 0.520 0.819 二次函数 三次函数 复合函数 0.511 0.915 0.493 0.937 0.498 0.935 0.517 0.915 0.623 0.770 0.515 0.946 幂函数 0.487 0.912 0.481 0.919 0.486 0.916 0.495 0.906 0.588 0.780 0.496 0.961 S函数 0.548 0.803 0.477 0.974 增长函数 0.511 0.915 0.493 0.937 0.498 0.935 0.517 0.915 0.623 0.770 0.515 0.983 指数函数 0.511 0.915 0.493 0.937 0.498 0.935 0.517 0.915 0.623 0.770 0.515 0.983 逻辑函数 0.511 0.915 0.493 0.937 0.498 0.935 0.517 0.915 0.623 0.770 0.515 0.983