黄土高原丘陵沟壑区天然沙棘种群空间分布格局研究  

Spatial Distribution Pattern of Natural Hippophae rhamnoides Population Standing in Hilly Loess Regions

作　　者：王成磊[1] 张文辉[1] 何景峰[1] 

机构地区：[1]西北农林科技大学西部环境与生态教育部重点实验室,陕西杨陵712100

出　　处：《西北植物学报》2011年第1期152-158,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家十一五科技支撑课题(2006BAD09B03);中国科学院西部行动计划项目(KZCX2-XB2-05)

摘　　要：经实地踏查,在黄土高原丘陵沟壑区陕西富县天然沙棘林区,设置10个10 m×10 m样地,采用离散分布理论拟合和聚集强度测定方法,对不同生境和年龄阶段的沙棘种群的空间分布格局及其动态进行了系统研究,以探讨沙棘种群分布格局动态特征.结果显示:(1)沙棘种群空间分布格局属聚集型,在6.25 m2面积上聚集强度较大.天然条件下,种群聚集强度最大的取样尺度,是其种群更新的最佳面积.(2)沙棘种群空间分布格局随海拔上升,聚集强度降低;阴坡的种群分布聚集强度总是大于阳坡.(3)随着种群年龄增加,分布格局由聚集型向随机型过渡,聚集强度减弱.在幼、老龄期聚集性最强的格局尺度为25.00 m2,中龄期为6.25 m2、25.00 m2.研究表明,天然沙棘种群的空间分布格局与其生物生态学特性、生长阶段以及生境条件关系密切,在保护与利用中应针对不同生境的差异以及不同生长阶段的特性进行适度人为干扰,促进种群的生长、更新和群落发育.The pattern and dynamics of the spatial distribution of Hippophae rhamnoides population in different habitats and age groups were studied by field surveying in Fuxian county Shaanxi province,discrete distribution pattern and aggregation intensity to clarify the dynamic distribution pattern of H.rhamnoides population.The results indicated that：（1）H.rhamnoides presented an aggregating distribution in different habitats and at different growth stages with its high aggregating intensity occurring with the quadrats of 6.25 m2.Under natural circumstances,the sampling area at the highest aggregating intensity was the optimal area for the population regeneration.（2）H.rhamnoides presented a spatial population distribution whose aggregating intensity declined with increased altitude;the aggregating intensities of the population standing on shade slopes were higher than those of the population standing on sunny slopes.（3）As H.rhamnoides population became older,their distributions transformed from the aggregating type into a random type while their aggregating intensities came down.The highest aggregating intensity appeared at the quadrat of 25.00 m2 in the young-age and old-age population and at the quadrat of 6.25 m2 and 25.00 m2 in the middle-aged population.The research showed that：The spatial distribution of the population closely related to their biological and ecological characteristics,growth stage and habitat conditions.In protection and utilization,we should take notice the difference of habitats and characteristics of different growth stage,and implement appropriate human interference and intermediate cutting to promote the growth of population,regeneration,and community development.

关 键 词：沙棘 空间分布 聚集分布型 尺度 

分 类 号：Q948.1[生物学—植物学]