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

YANG Yunxue， ZHANG Yanfang; ${author.authorNameEn}

doi:10.6046/zrzyyg.2020281

2021 Vol. 33, No. 3

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YANG Yunxue， ZHANG Yanfang, . 2021. Temporal-spatial evolutionary characteristics of ecological sensitivity in Yanhe River basin based on spatial distance index. Remote Sensing for Natural Resources, 33(3): 229-237. doi: 10.6046/zrzyyg.2020281

Citation:

YANG Yunxue， ZHANG Yanfang, . 2021. Temporal-spatial evolutionary characteristics of ecological sensitivity in Yanhe River basin based on spatial distance index. Remote Sensing for Natural Resources, 33(3): 229-237. doi: 10.6046/zrzyyg.2020281

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

1. School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, China；
2. National Experimental Teaching Demonstration Center of Geography, Shaanxi Normal University, Xi’an 710119, China

Received Date: 07 September 2020

Publish Date: 15 September 2021

Abstract

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

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References

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