三江平原中部耕作区水—土壤—植被耦合关系评价

doi:10.11720/wtyht.2025.1069

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Abstract

Soils and water emerge as important natural resources for plant growth and development. Understanding the responses of vegetation to water and soil characteristics is crucial to the scientific management of agricultural production. However, there is a lack of studies on the quantification of coupling characteristics of these factors. To reveal the coupling characteristics and responses among water, soils, and vegetation, this study investigated the farming areas in Huachuan, Jixian, and Youyi counties in the hinterland of the Sanjiang Plain. Using a survey of vegetation and the analysis of soil and water samples, this study established an index system for the assessment of the water-soil-vegetation coupling. The weights of the assessment indices were determined using principal component analysis, and a water-soil-vegetation coupling coordination model was constructed for the farming areas. Additionally, the primary factors influencing plant growth were analyzed using gray correlation analysis. Results indicate that vegetation, water, and soils in the farming areas are strongly coupled. Primary factors influencing vegetation growth and development include soil bulk density; sand content; zinc, boron, and copper contents, and the calcium ion concentration and hardness of water bodies. Notably, the coupling coordination degree is not consistent with the coupling degree. Specifically, water, soils, and vegetation in the farming areas exhibit strong coupling, characterized mainly by sound coordination. In contrast, some areas of Huachuan and Jixian counties exhibit poor coupling among water, soils, and vegetation. This is primarily due to water pollution, soil texture, and deficiencies in trace elements. Therefore, it is necessary to improve the groundwater ecosystem and implement protective farming of cultivated land. The coupling model of water, soil and vegetation established in this paper provides and important basis for ecological environment protection and restoration.

Key words： Sanjiang Plain farming area coupling coordination gray correlation

Received: 26 February 2024 Published: 22 July 2025

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	Articles by authors
	Jin-Bao HE
	Fan-Peng KONG
	Jian ZHAO
	Bo-Wen LIU
	Hong-Bo LIU

Cite this article:

Jin-Bao HE,Fan-Peng KONG,Jian ZHAO, et al. Assessment of water-soil-vegetation coupling characteristics in the central farming areas of the Sanjiang Plain[J]. Geophysical and Geochemical Exploration, 2025, 49(3): 718-726.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1069 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I3/718

Location of the study area and distribution of sampling points

Upper and lower limits of suitability indicators

指标	F₁	F₂	F₃	综合得分系数	权重
Ca²⁺	0.361	-0.104	-0.038	0.217	0.096
K⁺	-0.046	-0.114	0.900	0.039	0.017
S $O 4 2 -$	0.249	0.435	0.086	0.273	0.121
Cl^-	0.261	0.445	0.137	0.288	0.128
Mg²⁺	0.362	-0.049	0.015	0.235	0.104
Na⁺	0.334	-0.064	0.192	0.231	0.102
TDS	0.372	-0.007	0.064	0.256	0.113
N $O 3 -$	0.286	0.174	0.044	0.236	0.104
fCO₂	0.285	-0.059	-0.337	0.144	0.064
TH	0.366	-0.090	-0.021	0.224	0.099
HC $O 3 -$	0.233	-0.472	-0.037	0.049	0.022
pH	-0.073	0.564	-0.059	0.069	0.030

Matrix of principal component score coefficients and indicator weights for water body indicators

Principal component score coefficient matrix and index weight of soil indicators

Box plot of distribution of water evaluation indicators

Box plot of distribution of soil evaluation indicators

Gray correlation between NDVI and water and soil evaluation indicators

Classification and evaluation criteria for the coup-ling coordination degree of water soil vegetation system

Evaluation results of the coupling and coordination status of water soil vegetation system

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