鄂尔多斯高原雾冰藜在沙漠—河岸过渡带白刺沙堆上的空间分布特征  

Distribution pattern of Bassia dasyphylla on Tangutorum nitraria sand dunes in desert-riverside ecotone

作　　者：梁继业[1] 王彦阁[1] 杨晓晖[1] 

机构地区：[1]中国林业科学研究院林业研究所,北京100091

出　　处：《草业科学》2008年第5期42-47,共6页Pratacultural Science

基　　金：国家自然科学基金项目"鄂尔多斯高原北缘白刺沙堆空间格局及生态功能研究"(30571529)

摘　　要：采用点格局和标记点格局的方法对雾冰藜Bassia dasyphylla在唐古特白刺Tangutorum nitraria沙堆上的分布情况进行了分析。结果显示:1)雾冰藜在沙堆不同方向分布不均匀,以西北方向分布最多,占整个沙堆的61.49%,其次是西南方向,占26.87%,最少的是东北方向,只有2.09%,反映了雾冰藜对固定、半固定风沙土有较好的适应性,对流动风沙土适应性较差;2)雾冰藜聚集生长的距离范围小于沙堆的平均直径5.54 m,而且在小于这个尺度范围内雾冰藜与白刺沙堆表现为正相关,说明二者之间有相互吸引的共存关系;3)不同沙堆之间的雾冰藜数量彼此之间没有影响;4)雾冰藜在小尺度范围内表现为聚集分布,说明其种子的扩散一般是集中在植物周围,而不同沙堆间种子的扩散,风起到了重要的传递作用。The point pattern methods were used to study the distribution pattern of Bassia dasyphylla on Tangutorum nitraria sand dune.The results showed that B.dasyphylla and T.nitraria sand dunes existed a close relationship.The distribution of B.dasyphylla was uneven on sand dune in different directions,61.49% of B.dasyphylla distributed in the northwest,and 26.87% in the southwest,only 2.09% in the northeast.This suggested that B.dasyphylla could adapt the environment of fixed sand dunes or semi-fixed sand dunes,and its adaptation to the environment of flow sand dunes was poor.B.dasyphylla grew in cluster pattern on the sand dune and its distribution diameter was less than the average diameter（5.54 m） of T.nitraria sand dune.This might suggest a positive relationship between B.dasyphylla and T.nitraria sand dune.B.dasyphylla shown a gathering distribution within small scale（within a sand dune） and this might indicate that its seeds spread mainly around the plant,but in large scale（between sand dunes） the wind spread played a more important role for seed spread.

关 键 词：雾冰藜 白刺沙堆 点格局 标记点格局 

分 类 号：Q948[生物学—植物学]