Abstract
In order to study the spatial and temporal pattern variations of grassland resources and to promote the sustainable utilization of grassland resources, this paper, taking Huize County as an example, discusses the temporal and spatial pattern variations of grassland resources from the perspective of grassland resources comprehensive dynamic degree, different topographic conditions, geoscience information map and landscape pattern index. Remote sensing images in 2009 and 2016, the second national land survey database and the 2016 land use variation survey database were selected as the basic data source. The results show that: 1) from 2009 to 2016, Xinjie town and Tianba town have great variations in the comprehensive dynamic degree of grassland resources, while Wuxing town and Jinzhong town are the smallest variations. The number of grassland resources in the study area presents a spatial feature of “high in the north and south parts and low in the middle”; 2) topographic conditions have a certain impact on grassland resources. The grassland resources in the study area mostly exist in the areas with the elevation of 1800-2500m, the slope of over 25° and the aspect of sunny and semi-sunny. From 2009 to 2016, grassland resources net increase was 21134.51hm2. 3) From the perspective of geomatics information map and landscape pattern index, grassland resources have both increased and decreased from 2009 to 2016. The land conversion categories that have increased and decreased mainly include cultivated land, garden land, forest land, construction land, water area and other land types, among which the proportion of forest land variations greatly. Although the area of grassland resources increased, the number of grassland resources patches decreased. The average patch area increased, the proximity and aggregation between patches increased, and landscape fragmentation decreased, and the overall landscape pattern developed towards the aggregation direction.
Published Version
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