Temporal-spatial evolutionary characteristics of ecological sensitivity in Yanhe River basin based on spatial distance index

doi:10.6046/zrzyyg.2020281

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Abstract

Ecological sensitivity refers to the sensitive degree of an ecosystem to the changes in the natural environment and the interference of human activities. It can be used to reflect the liable degree and possibility of the occurrence of ecological environmental problems. Taking the Yanhe River basin in the loess hilly and gully region as an example, this study selected three quantitative assessment indicators (i.e., sensitivity indices of soil erodibility, ecological risks, and biodiversity) to construct a composite environmental sensitivity index (CESI) based on spatial distance index for a river basin. Then it explored the temporal-spatial changes in the ecological sensitivity of the Yanhe River basin during 1996—2016 by combining the center of gravity model, obtaining the following results. ①From the perspective of temporal change, the ecological sensitivity in the Yanhe River basin during 1996—2016 showed a downward trend, with CESI increasing from 1.38 in 1996 to 1.41 in 2016. This indicates that the quality of the ecological environment in the Yanhe River basin improved during the period. ② From the perspective of spatial change, the spatial distribution of the ecological sensitivity in the Yanhe River basin greatly changed during 1996—2016. In detail, the areas with high ecological sensitivity were concentrated in the upper reaches in 1996 but were mainly distributed in the middle and lower reaches after 2006. ③ The center of gravity of the ecologically sensitive areas at all levels shifted toward the middle reaches during 1996—2016. Meanwhile, the ecologically sensitive areas were distributed in a concentrated way in 1996 but in a both concentrated and dispersed manner in 2016. ④ The ecological sensitivity in the Yanhe River basin was greatly affected by land use. The project of returning farmland to forest (grass) and comprehensive management project in the Yanhe River basin played a key role in the process of reducing ecological sensitivity.

Keywords ecological sensitivity temporal-spatial changes spatial distance index center of gravity model Yanhe River basin

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Corresponding Authors: ZHANG Yanfang E-mail: 282166536@qq.com;zhangyf@snnu.edu.cn

Issue Date: 24 September 2021

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	Yunxue YANG
	Yanfang ZHANG

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Yunxue YANG,Yanfang ZHANG. Temporal-spatial evolutionary characteristics of ecological sensitivity in Yanhe River basin based on spatial distance index[J]. Remote Sensing for Natural Resources, 2021, 33(3): 229-237.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2020281 OR https://www.gtzyyg.com/EN/Y2021/V33/I3/229

Fig.1 The sketch map of Yanhe River Basin

Fig.2 Soil erosion sensitivity

Fig.3 Ecological risk sensitivity

Fig.4 Land use and coverage

Fig.5 Biodiversity sensitivity

Tab.1 Ecological sensitivity classification and area statistics of Yanhe River Basin

Fig.6 Comprehensive ecological sensitivity classification map

Fig.7 Ecological sensitivity shift map

Tab.2 The transfer distance and angle of the ecological sensitivity center of gravity from 1996 to 2016

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