Impact of soil salinization on the eco-environment quality of coastal wetlands:A case study of Yellow River Delta

doi:10.6046/zrzyyg.2022284

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Abstract

Soil salinization is an important reason for land degradation and desertification and has a huge impact on the eco-environment. Coastal wetlands are typical areas subjected to a weak eco-environment and severe salinization, and there is an urgent need to investigate the impact of soil salinization on their eco-environment. This study proposed the baseline-based soil salinity index (BSSI), which can effectively suppress the influence of complex features on surface salinization monitoring and improve the accuracy of saline soil extraction by 10% compared to other salinity index models. Furthermore, this study proposed the optimized water benefit-based ecological index (OWBEI) by optimizing the water benefit-based ecological index (WBEI), which can effectively increase the accuracy of eco-environment quality assessment to 87%. Finally, this study explored the mechanical processes of the influence of soil salinization on the eco-environment quality based on the distribution of soil salinization and eco-environment quality obtained from the Yellow River Delta. The results show that the deterioration of soil salinization has led to an increase in the soil vulnerability of coastal wetlands, indirectly resulting in a continuous decrease in eco-environment quality. Although eco-environment protection measures have been continuously proposed, few of them are tailored to the solving of salinization. This leads to the deterioration of the ecological quality, which then yields negative feedback to the soil and eventually forms a vicious circle. This adversely affects local production, life, and social development.

Keywords coastal wetlands soil salinization eco-environment quality virtual salinization baseline vegetation index

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Issue Date: 21 December 2023

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	Zhimei ZHANG
	Yanguo FAN
	Zhijun JIAO
	Qingchun GUAN

Cite this article:

Zhimei ZHANG,Yanguo FAN,Zhijun JIAO, et al. Impact of soil salinization on the eco-environment quality of coastal wetlands:A case study of Yellow River Delta[J]. Remote Sensing for Natural Resources, 2023, 35(4): 226-235.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022284 OR https://www.gtzyyg.com/EN/Y2023/V35/I4/226

Fig.1 Location of the study area

Tab.1 Landsat datasets

Fig.2 The mechanism analysis system of soil salinization on coastal wetland ecology

Tab.2 Saline soil classification

Fig.3 Schematic diagram of index structure

方法	公式
SI^[1]	$S I = (B × R)$
SI1^[2]	$S I 1 = (G × R)$
SI2^[2]	$S I 2 = (G 2 + R 2 + N I R 2)$
VSSI^[3]	$V S S I = 2 G - 5 R + N I R$

Tab.3 Classification method

Tab.4 Classification accuracy of saline soil

Fig.4 False color images of the surface

Fig.5 Soil salinization grade maps

Tab.5 Area and proportion of soil salinization in the Yellow River Delta

Fig.6 True color images of the surface of the Yellow River Estuary

Tab.6 Comparison results of EI and OWBEI from 2006 to 2020

Fig.7 Soil salinization grade maps

Fig.8 The result of OWBEI

Fig.9 Average values of various ecological indicators at the Yellow River estuary

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