首页 | 本学科首页   官方微博 | 高级检索  
   检索      

放牧和围封条件下羊草碱化草地中斑发布格局研究
引用本文:杨正宇,辛晓平.放牧和围封条件下羊草碱化草地中斑发布格局研究[J].植物生态学报,2000,24(6):656-661.
作者姓名:杨正宇  辛晓平
作者单位:[1]中国科学院植物研究所植被数量生态学开放研究实验室,北京 [2]中国农业科学院区划所,北京
基金项目:国家自然科学基金项目!(39899370 )
摘    要:应用分形方法对松嫩平原羊草碱化划地中斑块分布格局进行定量估计,分析了放牧干扰和围封条件下斑块分布特征及动态。结果表明:随放牧强度增加,羊草斑块的斑块化指数增大,斑块面积范围的上下限变小,分布趋于破碎化和不均匀,斑块公布格局趋于复杂,自相似规律发生转折的尺度增多。围封后,1989~1993年羊草斑块总面积增加,斑块数目减少,斑块化指数降低,1994年后羊草斑块分布格局基本稳定。羊草斑块分布的双对数曲

关 键 词:斑块分布格局  放牧干扰  恢复演替  羊草碱化草地
修稿时间:1998-09-29

PATCH DYNAMICS OF ALKALINE LEYMUS CHINENSIS GRASSLAND UNDER GRAZED AND UNGRAZED CONDITIONS
XIN Xiao,Ping.PATCH DYNAMICS OF ALKALINE LEYMUS CHINENSIS GRASSLAND UNDER GRAZED AND UNGRAZED CONDITIONS[J].Acta Phytoecologica Sinica,2000,24(6):656-661.
Authors:XIN Xiao  Ping
Abstract: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.
Keywords:Patch distribution pattern  Grazing disturbance  Restoration succession  Fractal metho@  
本文献已被 CNKI 维普 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号