2024年2月25日 星期日
陕西府谷自然保护区杜松种群的空间分布格局及其动态
Spatial distribution patterns and dynamics of Juniperus rigida population in Fugu Nature Reserve of Shaanxi Province
2007年 第16卷 第4期 页码[34-37]    下载全文[0.6MB]  
摘要

采用方差/均值比率法和5个聚集度指标研究了陕西府谷自然保护区杜松(Juniperus rigida Sieb.etZucc.)种群15个样地的空间分布格局及动态特征。结果表明,杜松种群的空间分布格局为聚集分布,其v/m值、负二项参数、聚块性指数、丛生指数、平均拥挤度和Morisita指数分别为1.98、1.84、1.54、0.98、2.79和1.54。随着径级的增大,聚块性指数逐渐减小,种群的聚集程度也减小,Ⅶ级大树呈随机分布,该种群表现出明显的扩散趋势。调查发现,人为干扰对杜松种群的空间分布格局有较大影响。 

Abstract

Spatial distribution patterns and dynamics of fifteen plots of Juniperus rigida Sieb.et Zucc. population in Fugu Nature Reserve of Shaanxi Province were studied by using methods of variance/mean ratio and five clustering indexes. The results showed that spatial distribution patterns of J. rigida population were clumping, and v/m ratio, negative binomial parameter, patchiness index, clumping index, mean crowing index and Morisita's index were 1. 98, 1. 84, 1. 54, 0. 98, 2. 79and 1. 54 respectively. With diameter class increasing, patchiness index decreased gradually and clumping degree of population decreased, trees of diameter classⅦ distributed randomly, so the population emerged obvious spreading trend. It is concluded that human disturbance can effectively affect spatial distribution patterns of J. rigida population.

关键词杜松种群; 府谷自然保护区; 空间分布格局; 动态
Key wordsJuniperus rigida Sieb. et Zucc. population; Fugu Nature Reserve; spatial distribution pattern; dynamics
作者褚胜利a,李登武b,c,李景侠b,c
所在单位西北农林科技大学 a.生命科学学院;b.林学院;c.西部环境与生态教育部重点实验室,陕西杨陵712100
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基金项目国家自然科学基金资助项目(30671672); 中国科学院知识创新项目(KZCX1-06); 西部环境与生态教育部重点实验室客座基金资助项目;