Arid Zone Research ›› 2023, Vol. 40 ›› Issue (8): 1258-1267.doi: 10.13866/j.azr.2023.08.06
• Land and Water Resources • Previous Articles Next Articles
LI Xiaoyu(),JIA Keli(),WEI Huimin,CHEN Ruihua,WANG Yijing
Received:
2023-01-06
Revised:
2023-06-12
Online:
2023-08-15
Published:
2023-08-24
LI Xiaoyu, JIA Keli, WEI Huimin, CHEN Ruihua, WANG Yijing. Prediction of soil salt content based on the random forest algorithm[J].Arid Zone Research, 2023, 40(8): 1258-1267.
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Tab. 1
The calculation formula of spectral indexes"
光谱指数 | 计算公式 | 参考文献 |
---|---|---|
盐分指数(SI_T) | (Red-NIR)×100 | [ |
盐分指数1(SI1) | [ | |
盐分指数2(SI2) | [ | |
盐分指数3(SI3) | [ | |
盐分指数4(SI4) | (Blue×Red)/Green | [ |
盐分指数5(SI5) | (Green+Red)/2 | [ |
盐渍化指数1(S1) | Blue/Red | [ |
盐渍化指数2(S2) | (Blue-Red)/(Blue+Red) | [ |
盐渍化指数3(S3) | (Green×Red)/Blue | [ |
盐度比值指数(SAIO) | (Red-NIR)/(Green+NIR) | [ |
土壤调节植被指数(SAVI) | [(NIR-Red)×(1+L)]/(NIR+Red+L);L=0.5 | [ |
绿度差值植被指数(GDVI) | (NIR2-Red2)/(NIR2+Red2) | [ |
冠层响应盐度指数(CRSI) | [ |
Tab. 2
Soil salinization degree and sample statistics in Yinchuan Plain"
盐渍化等级 | 含盐量/(g·kg-1) | 样本数量 | 含盐量均值/(g·kg-1) | 含盐量最大值/(g·kg-1) | 含盐量最小值/(g·kg-1) | 变异系数/% |
---|---|---|---|---|---|---|
非盐渍化 | <1 | 91 | 0.56 | 0.98 | 0.09 | 39.79 |
轻度盐渍化 | 1~2 | 64 | 1.46 | 1.96 | 1.00 | 20.09 |
中度盐渍化 | 2~4 | 55 | 2.82 | 3.97 | 2.00 | 19.42 |
重度盐渍化 | 4~6 | 37 | 4.90 | 5.91 | 4.06 | 11.97 |
盐土 | >6 | 50 | 12.00 | 20.74 | 6.14 | 35.10 |
总样本 | 297 | 3.63 | 20.74 | 0.09 | 138.76 |
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