基于遥感影像的新疆渭干河—库车河三角洲土壤水盐与植被覆盖度的关系

doi:10.13866/j.azr.2024.07.05

Abstract

Abstract:

Based on the soil samples and remote sensing image data, this paper takes the Ugan-Kuqa River Delta Oasis, a typical arid region in Xinjiang, as the study area. FVC was calculated utilizing the pixel dichotomous model. Inverse distance weight interpolation and statistical analysis methods such as correlation and mediating effect analyses were used to study the impact of soil water content and salinity at depths of 0-50 cm on the spatial changes of FVC. This paper can provide a theoretical basis for optimizing resource allocation and formulating ecological restoration measures in arid areas. The results were: (1) FVC showed a west-east decreasing trend in space, directly proportional to the water content and inversely with the salinity. (2) The water content of each soil layer gradually enhanced from top to bottom, and the salinity revealed an inverse trend, with≥moderate variability in water content and salinity at different depths. (3) The soil water content at the 10-20 cm layer alone exhibited a mediating effect between FVC and the water content of the 0-10 cm surface layer. The salinity in the deeper layers of 10-20, 10-30, and 30-50 cm exhibits a mediating effect between FVC and salinity in the 0-10 cm layer. In other words, the salinity in deeper soil layers influenced FVC by affecting the salinity of the surface soil. (4) The salinity in the 0-10 cm layer most significantly impacted the FVC, influencing>47.90% of the spatial variability of FVC. Additionally, the impact of salinity at various soil depths on FVC surpasses that of water content.

Key words: Ugan-Kuqa River Delta Oasis, soil water content, soil salinity, fractional vegetation cover, correlation analysis

ZHENG Liuna, JIANG Hongnan, SUN Mengting. Correlations between soil water content, salinity, and fractional vegetation cover in the Ugan-Kuqa River Delta Oasis of Xinjiang ascertained based on remote sensing images[J].Arid Zone Research, 2024, 41(7): 1131-1139.

Figures/Tables 9

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References 20

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年份	不同土层	土壤含水量/%				变异系数/%	土壤含盐量/（g·kg^-1）				变异系数/%
年份	不同土层	最小值	最大值	均值	标准差	变异系数/%	最小值	最大值	均值	标准差	变异系数/%
2011年	0~10 cm	0.05	37.62	7.26	8.01	110.33	0.10	224.4	51.65	54.45	105.42
	10~30 cm	1.02	47.90	15.68	8.65	55.17	0.10	27.90	5.90	5.26	89.15
	30~50 cm	1.55	30.08	16.05	7.75	48.29	0.10	25.70	4.31	4.36	101.16
2021年	0~10 cm	0.61	23.99	10.73	6.51	60.68	0.10	69.70	21.56	21.25	98.55
2021年	10~20 cm	6.23	30.15	16.70	5.84	35.00	0.10	23.40	5.86	5.02	85.67

变量	2011年FVC	2021年FVC
0~10 cm土壤含水量	0.394^**	0.488^**
0~10 cm土壤含盐量	-0.587^**	-0.584^**

年份	影响因素	对数		二次多项式回归模型		三次多项式回归模型
年份	影响因素	R²	P值	R²	P值	R²	P值
2011年	0~10 cm土壤含水量	0.074	0.055	0.180	0.009^**	0.254	0.003^**
2011年	0~10 cm土壤含盐量	0.543	0.000^**	0.457	0.000^**	0.519	0.000^**
2021年	0~10 cm土壤含水量	0.160	0.000^**	0.255	0.000^**	0.255	0.000^**
2021年	0~10 cm土壤含盐量	0.479	0.000^**	0.401	0.000^**	0.439	0.000^**

2011年			2021年
控制变量	实验变量	偏相关系数	控制变量	实验变量	偏相关系数
0~10 cm土壤含水量	r_{10~30 cm土壤含水量、FVC 0~10 cm土壤含水量}	-0.025	0~10 cm土壤含水量	r_{10~20 cm土壤含水量、FVC 0~10 cm土壤含水量}	0.119
0~10 cm土壤含水量	r_{30~50 cm土壤含水量、FVC 0~10 cm土壤含水量}	-0.210	0~10 cm土壤含盐量	r_{10~20 cm土壤含盐量、FVC 0~10 cm土壤含盐量}	-0.282^*
0~10 cm土壤含盐量	r_{10~30 cm土壤含盐量、FVC 0~10 cm土壤含盐量}	-0.288^*
0~10 cm土壤含盐量	r_{30~50 cm土壤含盐量、FVC 0~10 cm土壤含盐量}	-0.205

2011年				2021年
检验步骤	标准化方程	自变量	P值	检验步骤	标准化方程	自变量	P值
第一步	FVC=0.135W₃₀	W₃₀	0.349	第一步	FVC=0.403W₂₀	W₂₀	0.000^**
第二步	W₁₀=0.397W₃₀	W₃₀	0.004^**	第二步	W₁₀=0.665W₂₀	W₂₀	0.000^**
第三步	FVC=-0.025W₃₀+0.405W₁₀	W₃₀	0.863	第三步	FVC=0.140W₂₀+0.396W₁₀	W₂₀	0.301
第三步		W₁₀	0.008^**			W₁₀	0.004^**
第一步	FVC=0.019W₅₀	W₅₀	0.896	第一步	FVC=-0.561S₂₀	S₂₀	0.000^**
第二步	W₁₀=0.478W₅₀	W₅₀	0.00^**	第二步	S₁₀=0.671S₂₀	S₂₀	0.000^**
第三步	FVC=-0.220W₅₀+0.499W₁₀	W₅₀	0.148	第三步	FVC=-0.308S₂₀-0.377S₁₀	S₂₀	0.014^*
第三步		W₁₀	0.002^**			S₁₀	0.003^**
第一步	FVC=-0.571S₃₀	S₃₀	0.000^**
第二步	S₁₀=0.682S₃₀	S₃₀	0.000^**
第三步	FVC=-0.319S₃₀-0.370S₁₀	S₃₀	0.045^*
第三步		S₁₀	0.021^*
第一步	FVC=-0.501S₅₀	S₅₀	0.000^**
第二步	S₁₀=0.624S₅₀	S₅₀	0.000^**
第三步	FVC=-0.210S₅₀-0.468S₁₀	S₅₀	0.163
		S₁₀	0.003^**

Correlations between soil water content, salinity, and fractional vegetation cover in the Ugan-Kuqa River Delta Oasis of Xinjiang ascertained based on remote sensing images

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