不同生境条件下中国柽柳空间分布点格局分析

Analysis of spatial point pattern of Tamarix chinensis in different habitats

通过聚类分析方法将黄河三角洲中国柽柳的生境划分为三种类型,即高盐干旱型生境,低盐干旱型生境和低盐湿润型生境;同时运用点格局分析方法,分析了不同生境中中国柽柳在不同尺度下空间分布规律,结果表明,高盐干旱和低盐干旱生境中龄级2的中国柽柳以及低盐湿润生境中龄级3的中国柽柳在所有尺度范围内都呈随机分布,而其它龄级在不同生境的空间分布规律具有较显著差异,说明黄河三角洲低龄级和高龄级中国柽柳能够通过调整空间分布模式来适应适应水盐平衡变化等生态过程;不同生境中的中国柽柳各龄级之间关系在不同尺度内呈正相关概率要大于呈负相关概率,个别尺度上某些龄级之间没有相关性。

By cluster analysis, the habitats of Tamarix chinensis in the Yellow River Delta are classified into three types： habitat with high salinity and drought condition, habitat with low salinity and drought condition, and habitat with low salinity and moist condition. Using point pattern analysis method, we analyze the spatial distribution rules of different habitats Tamarix chinensis at different scales. The results show that in high salinity and drought habitat, as well as low salinity and drought habitat, the age class 2 T. chinensis is randomly distributed in all scales; while in low salinity and moist habitat, the age class 3 T. chinensis is also randomly distributed in all scales. Distribution rules of other age class T. chinensis are significantly different in different habitats, indicating that in the Yellow River Delta the younger and senior age classes T. chinensis are able to adapt to ecological processes of water-salt balance by adjusting the spatial distribution patterns. The relationships among T. chinensis age classes in different habitats are more positivdy correlated, while some age classes have no relation at some spatial scales.