放牧强度对克氏针茅(Stipa krylovii)草原植被景观格局的影响

doi:10.7522/j.issn.1000-694X.2016.00061

摘要/Abstract

摘要：

以内蒙古呼伦贝尔市克鲁伦河流域的克氏针茅(Stipa krylovii)典型草原为研究区,获取WorldView-2高分辨率多光谱数据,采用遥感图像多尺度分割算法,从轻度放牧、中度放牧和重度放牧利用角度,探讨放牧干扰对草原景观格局的影响。结果表明:斑块数、边密度、景观形状指数和平均分维度随着分割尺度的增大逐渐减少,选择100的分割尺度较为合理。景观形状指数在放牧梯度间的区分度最大,可用于判定干扰强度对植被影响程度的主要景观指数。放牧因子是该区域植被景观破碎化的决定因素,重度放牧区景观指数高于轻度放牧区和中度放牧区,重度放牧区景观破碎化严重,受降水影响明显,斑块间变异程度大。

关键词: 景观形状指数, 放牧干扰, 斑块, NDVI, 多尺度分割

Abstract:

The aim of this study was to research the landscape pattern responding to light, moderate and heavy grazing intensities by using multi-scale segmentation algorithm with the high resolution multispectral data of WorldView-2 for the Kherlen River Basin in the Hulunbeir Steppe. The results showed that: number of patches, edge density, landscape shape index, and mean patch fractal dimension gradually reduced with the increase of segmentation scale, and the reasonable segmentation scale was at 100. Landscape shape index was maximum partition degree among grazing gradient, which could be used for determining the degree of disturbance intensity impacting on vegetation. Grazing was the decisive factor in vegetation landscape fragmentation in the region. Landscape index in heavy grazing area was higher than light and moderate grazing area, and landscape fragmentation was serious by heavy grazing intensity. The patches were affected by precipitation and great variation between patches in heavy grazing area.

Key words: landscape shape index, grazing disturbance, patch, NDVI, multi-resolution segmentation

中图分类号:

S283

宋彦涛, 乌云娜, 张靖, 霍光伟, 张凤杰. 放牧强度对克氏针茅(Stipa krylovii)草原植被景观格局的影响[J]. 中国沙漠, 2016, 36(3): 674-680.

Song Yantao, Wuyunna, Zhang Jing, Huo Guangwei, Zhang Fengjie. Effects of Grazing Intensity on Vegetation Landscape Pattern in Stipa krylovii steppe in Inner Mongolia[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(3): 674-680.

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