阿拉尔垦区土壤盐渍化遥感监测及时空特征分析

doi:10.12118/j.issn.1000-6060.2021.531

Abstract

Abstract:

This paper analyzes the distribution and spatial variation of saline soil of different degrees in the Aral Reclamation Area, Xinjiang, China and provides an important reference for effectively controlling and preventing reclaimed saline soil in the reclamation area. Using Landsat ETM+ in 2011 and Landsat OLI in 2021, the remote salinization detection index (SDI) model of soil salinization was constructed using the salinity index and the normalized vegetation index to extract and analyze soil salinization information in the Aral Reclamation Area. Soil data were collected from 139 surface soil sample points (0-10 cm) in the Aral Reclamation Area, and three samples per point were collected using the triangular sampling method. Soil extract with water and soil (5:1) was prepared, and soil conductivity was measured in the laboratory. According to the soil conductivity value corresponding to the soil salinization grade standard of the American Saline Alkali Soil Laboratory, the soil salinization grade in the Aral Reclamation Area is divided into five categories. According to the natural discontinuity method, the SDI is divided into five levels to verify its classification accuracy and explore the temporal and spatial distribution characteristics of soil salinization in the study area in the recent 10 years. The fitting degree between the SDI model of soil salinization and the measured soil conductivity R²=0.7579. The farmland in the reclamation area comprises mainly nonsaline soil and light saline soil, the riverbed and grassland of the Tarim River are mainly moderately saline soil and heavy saline soil, and the land desertification and the area near the desert comprise mainly saline soil. From 2011 to 2021, the area of nonsaline soil and mild saline soil in the Aral Reclamation Area increased by 318.22 km² and 0.80 km², respectively; the area of moderate and severe soil salinization decreased by 229.87 km²; and the area of saline soil increased by 68.61 km². In the recent 10 years, the degree of soil salinization in the north and south of the Aral Reclamation Area has improved significantly, the degree of soil salinization in the middle and eastern parts has increased, and the overall soil salinization in the reclamation area has improved. The SDI has a certain reference value for the study of soil salinization and provides a scientific basis for the real-time monitoring and accurate treatment of soil salinization in reclamation areas.

Key words: soil salinization, saline soil, salinization detection index (SDI), salinity index-normalized difference vegetation index (SI-NDVI), Aral Reclamation Area

DAI Yunhao,GUAN Yao,ZHANG Qinkai,SUN Junjie,HE Xinghong. Remote sensing monitoring and temporal and spatial characteristics of soil salinization in Aral Reclamation Area[J].Arid Land Geography, 2022, 45(4): 1176-1185.

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模型	公式	拟合度R²
线性模型	y=0.2863-0.2832x	0.8677
二次模型	y=0.3163-0.4948x+0.2251x²	0.8867
指数模型	y=0.3488×0.1816^x-0.0239	0.8881
几何模型	y=-0.3565x^0.4846+0.3842	0.8877
双曲模型	y=1.0/(2.5226+12.022x)	0.8609
对数平方模型	y=0.0334-0.3386logx-0.1013logx²	0.8886

指标	非盐渍土	轻度盐渍土	中度盐渍土	重度盐渍土	盐土
土壤电导率/mS·cm^-1	0~2	2~4	4~8	8~16	>16
SDI模型	0.000~0.3119	0.3119~0.3877	0.3877~0.5393	0.5393~0.8425	>0.8425

年份	非盐渍土	轻度盐渍土	中度盐渍土	重度盐渍土	盐土
2011	972.98	251.09	405.55	872.51	810.60
2021	1291.20	251.89	328.71	719.48	879.21

土壤盐渍化等级		2011年
土壤盐渍化等级		非盐渍土	轻度盐渍土	中度盐渍土	重度盐渍土	盐土
2021年	非盐渍土	758.50	107.67	155.89	183.29	51.11
	轻度盐渍土	87.83	39.14	60.40	51.07	8.65
	中度盐渍土	58.94	40.45	99.71	105.19	15.31
	重度盐渍土	43.58	20.56	70.42	392.91	140.02
	盐土	19.10	3.35	7.12	94.15	506.45

Remote sensing monitoring and temporal and spatial characteristics of soil salinization in Aral Reclamation Area

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