PATCH DYNAMICS OF ALKALINE LEYMUS CHINENSIS GRASSLAND UNDER GRAZED AND UNGRAZED CONDITIONS
PATCH DYNAMICS OF ALKALINE LEYMUS CHINENSIS GRASSLAND UNDER GRAZED AND UNGRAZED CONDITIONS
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DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
X. Xiao;Yang Zheng
中科院分区：
文献类型：
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作者：
X. Xiao;Yang Zheng
A study on the dynamics of patch distribution was carried out on the Songnen alkaline Leymus chinensis grassland under grazed(unfenced) and fenced conditions.Patch size distribution and pattern were analyzed using fractal methods.Patchiness of L.chinensis, the dominant species of the zonal vegetation, increased with grazing intensity,but the upper and lower limit of patch sizes decreased and the pattern became fragmented and skewed. Scaling analysis indicated that there was a scale transition under both grazed and fenced conditions, but the threshold position was reduced under grazing.The first four years of restoration succession following the exclusion of grazing (1989 1993) showed an increase in the total area of patches, and a decrease in both the number of patches and the Korcak patchiness exponent.After 1994,the spatial pattern became relatively stable.This pattern showed sharp transition at the scale of 45 m 2.It was also found that dynamics of L. chinensis patches differed across different scales.
