流域绿洲土壤盐分多模型反演效果评估

doi:10.13866/j.azr.2024.07.04

干旱区研究 ›› 2024, Vol. 41 ›› Issue (7): 1120-1130.doi: 10.13866/j.azr.2024.07.04 cstr: 32277.14.j.azr.2024.07.04

流域绿洲土壤盐分多模型反演效果评估

龙威夷¹^,²^,³(), 施建飞¹^,²^,³, 李双媛¹^,²^,³, 孙金金¹^,²^,³, 王玉刚¹^,²^,³()

1.中国科学院新疆生态与地理研究所，荒漠与绿洲生态国家重点实验室，新疆乌鲁木齐 830011
2.中国科学院大学，北京 100049
3.中国科学院阜康荒漠生态系统国家站，新疆阜康 831505

收稿日期:2024-03-12 修回日期:2024-04-05 出版日期:2024-07-15 发布日期:2024-08-01
通讯作者: 王玉刚. E-mail: wangyg@ms.xjb.ac.cn
作者简介:龙威夷（1998-），男，硕士研究生，研究方向为土壤盐渍化过程模拟. E-mail: longweiyi21@mails.ucas.ac.cn
基金资助:
“天山英才”培养计划(2023TSYCLJ0048);国家自然科学基金(42371126);国家自然科学基金(42330503)

Evaluation of multimodel inversion effects on soil salinity in oasis basin

LONG Weiyi¹^,²^,³(), SHI Jianfei¹^,²^,³, LI Shuangyuan¹^,²^,³, SUN Jinjin¹^,²^,³, WANG Yugang¹^,²^,³()

1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Fukang Station of Desert Ecology, Chinese Academy of Sciences, Fukang 831505, Xinjiang, China

Received:2024-03-12 Revised:2024-04-05 Published:2024-07-15 Online:2024-08-01

摘要/Abstract

摘要：

为更好地实现区域土壤盐分的监测和治理，促进绿洲可持续发展，本文基于气候、地形、植被等相关数据，结合三工河流域平原绿洲土壤表层盐分调查，对比评估不同模型（随机森林，支持向量机，决策树，普通克里金）土壤盐分反演效果。结果表明：绿洲土壤样本盐分含量为0.29~30.18 g·kg^-1，平均值为4.06 g·kg^-1，变异系数为149.73%，属于强变异；随机森林模型相较于其他模型具有更高的反演精度，决定系数、均方根误差和绝对平均误差分别为0.73、1.89 g·kg^-1和1.49 g·kg^-1；随机森林模型反演显示，高值区主要分布在西北部和中部区域，并且在9种环境协变量中，高程和地下水矿化度对土壤盐分反演精度影响较大。总的来说，以随机森林模型为手段的机器学习方法，不仅能够避免数据的平滑效应和图斑边界两侧的突变，还能有助于识别绿洲局部空间盐分状况，研究结果可为干旱区绿洲土壤盐渍化的长期监测提供技术和方法参考。

关键词: 机器学习, 土壤盐分, 空间分布, 三工河流域, 干旱区

Abstract:

A case study was conducted on the plain oasis in the Sangong River Basin of Xinjiang, China, to monitor and control soil salinity to improve the sustainable development of oases. Based on the climate, topography, vegetation, groundwater, and salinity of the soil survey data, many model methods, such as the Random Forest model, Support Vector Machine, Decision Tree, and Ordinary Kriging, were applied to estimate the inversion accuracy and the spatial distribution of soil salinity in the topsoil. The results revealed that the range of soil salinity values was 0.29-30.18 g·kg^-1 and an average of 4.06 g·kg^-1 for the sample sites. The value of the coefficients of variation was 149.73%, indicating a robust spatial variability. Among the four models, the Random Forest model showed a higher simulation precision compared to the others, with a coefficient of determination value of 0.73, a root-mean-square error value of 1.89 g·kg^-1, and an absolute mean error value of 1.49 g·kg^-1. The results of the Random Forest model inversion revealed that areas of higher soil salinity were concentrated in the northwest and the midbasin. Among the nine environmental covariates, elevation and groundwater salinity had a significant impact on the accuracy of identifying spatial distribution characteristics of soil salinity. In general, the Random Forest model as a machine learning method can not only avoid the smoothing effect and abrupt changes on both sides of the map boundary but also identify the local spatial distribution of soil salinity in the basin. The results of this study can provide technical and methodological applications for the long-term monitoring of soil salinization in arid areas.

Key words: machine learning, soil salinity, spatial distribution, Sangong River Basin, arid area

龙威夷, 施建飞, 李双媛, 孙金金, 王玉刚. 流域绿洲土壤盐分多模型反演效果评估[J]. 干旱区研究, 2024, 41(7): 1120-1130.

LONG Weiyi, SHI Jianfei, LI Shuangyuan, SUN Jinjin, WANG Yugang. Evaluation of multimodel inversion effects on soil salinity in oasis basin[J]. Arid Zone Research, 2024, 41(7): 1120-1130.

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数据名称	数据精度	数据格式	简介及来源
气象数据	1 km	TIFF	气象数据包括气温和降水数据，采用的1901—2022年中国1 km逐月平均气温和降水量数据集，数据来源于国家科技基础条件平台—国家地球系统科学数据中心（http://www.geodata.cn）
高程数据	30 m	TIFF	高程数据包括高程、坡向、坡度，数据来源于美国NASA和NGA的航天飞机雷达地形测绘项目（Shuttle Radar Topography Mission，SRTM）的成果产品，下载地址为 https://srtm.csi.cgiar.org，坡向和坡度是基于高程在ArcGIS中计算得出
土壤湿度数据	1 km	TIFF	土壤湿度数据采用2000—2020年中国1 km土壤湿度日尺度数据集，数据来源于“国家青藏高原科学数据中心”（http://data.tpdc.ac.cn）
NDVI数据	30 m	TIFF	NDVI数据基于Google Earth Engine（GEE）平台，选择可用的Landsat 8数据的波段4（红光波段，R）和波段5（近红外波段，NIR）计算NDVI，其中NDVI=（NIR-R）/（NIR+R）
矿化度数据	30 m	TIFF	地下水矿化度数据采用研究区历史数据
pH数据	30 m	TIFF	pH数据采用研究区实测数据

盐渍化等级	含盐量/（g·kg^-1）	数量占比/%	均值/（g·kg^-1）	最小值/（g·kg^-1）	最大值/（g·kg^-1）	变异系数/%
非盐渍化	<3	68	1.02	0.29	2.86	66.81
轻度盐渍化	3~6	10	4.36	3.01	5.95	28.67
中度盐渍化	6~9	7	7.67	6.27	8.74	13.82
重度盐渍化	9~12	7	10.57	9.25	11.61	8.50
盐土化	>12	8	20.79	13.40	30.18	27.86
总体样本		100	4.06	0.29	30.18	149.73

模型	指标	最小值 /（g·kg^-1）	最大值 /（g·kg^-1）	均值 /（g·kg^-1）	标准差 /（g·kg^-1）
RF	R²	0.66	0.87	0.73	0.05
	RMSE	1.02	4.20	1.89	0.44
	MAE	0.86	3.11	1.49	0.33
SVM	R²	0.61	0.79	0.66	0.04
	RMSE	1.35	1.92	1.73	0.15
	MAE	1.31	1.76	1.57	0.12
DT	R²	0.67	0.74	0.70	0.02
	RMSE	0.56	2.33	1.66	0.42
	MAE	0.73	2.16	1.53	0.32
OK	R²	0.23	0.32	0.28	0.03
	RMSE	3.74	5.23	4.46	0.41
	MAE	2.81	3.69	3.27	0.25

模型	最小值 /（g·kg^-1）	均值 /（g·kg^-1）	最大值 /（g·kg^-1）	标准差 /（g·kg^-1）
RF	0.50	4.80	22.41	2.37
SVM	0.50	4.03	21.00	2.22
DT	0.29	3.91	30.18	5.26
OK	0.46	4.71	36.22	3.96

流域绿洲土壤盐分多模型反演效果评估

Evaluation of multimodel inversion effects on soil salinity in oasis basin

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