Land use changes of Weihe River Basin and it's influence on the ecological spatial pattern

This paper is the result of monitoring and evaluating engineering of natural resources.

Objective As a new expansion business of China Geological Survey in 2021, the comprehensive survey of natural resources aims to serve land and space planning, use control and ecological protection and restoration.

Methods Based on the monitoring data of land use/cover change in the watershed in 2000, 2010, and 2020, ArcGIS software was used to analyze the spatiotemporal changes in land use types and ecological space of Weihe River Basin.

Results The results show that: 1) during 2000-2010, 804.4 km², 350.3 km² and 327.6 km² of cropland converted into grassland, forest and constructive land respectively, while only 94.3 km² grassland, 10.4 km² forest and 1.2 km² constructive land converted into cropland; 2) during 2010-2020, 16646.8 km², 3024.5 km² and 2547.9 km² of cropland converted into grassland, forest and constructive land respectively, while 16867.7 km² grassland, 3103.6 km² forest and 2528.82 km² constructive land converted into cropland; 3) during 2000-2020, the conversion of ecological space land in this region reaches 48,165 km², of which the ecological→semi-ecological land was 20172 km², the semi-ecological→ecological land was 20,897 km², the weak ecological→semi-ecological land was 2,519 km², and the semi-ecological→weak ecological land was 2754 km². It reflects that the conversion of ecological space land in the region tends to balance and the quality of the ecosystem is slowly increasing.

Conclusions The results is of great significance for accelerating comprehensive regionalization of natural resources and optimizes "three-zone and the-lines" of the Territorial Spatial Plan in the Weihe River Basin.