学术
三峡库区特有植物荷叶铁线蕨种群分布格局研究
周赛霞[1,2,3] 江明喜[1] 黄汉东[1]
[1]中国科学院武汉植物园,武汉430074 [2]中国科学院研究生院,北京100039 [3]江西省、中国科学院庐山植物园,庐山332900
摘 要:
通过相邻格子样方法采集数据，应用点格局分析技术研究了荷叶铁线蕨（Adiantum reniforme var．sinense）种群空间格局，结果表明：荷叶铁线蕨的空间分布格局和空间关联性与空间尺度、植株大小密切相关。在较小的空间尺度上（4．5m），荷叶铁线蕨种群趋向于聚集分布，个体间有较强的空间正关联；在较大的空间尺度上（〉5m），荷叶铁线蕨呈随机分布，空间关联性减弱。成熟植株具有更明显的聚集分布趋势。大小级差异越小，植株间的正关联关系越强。荷叶铁线蕨的更新较好，但更新苗分布不均匀。建议在该物种原生种群的就地保护和恢复重建中，在减少人为采挖的同时，适当加大灌木层密度、降低草本层的郁闭度。[著者文摘]
文章出处:
《武汉植物学研究》-2008年26卷1期 -59-63页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-470X（2008）01-0059-05
Spatial pattern of Adiantum reniforme var. sinense, Endemic to the Three-Gorge Reservoir Region
ZHOU Sai-Xia, JIANG Ming-Xi＊ , HUANG Han-Dong （ 1. Wuhan Botanical Garden, The Chinese Academy of Sciences, Sciences, Beijing 100039, China; 3. Lushan Botanical Garden, Wuhan 430074, China; 2. Graduate University of the Chinese Academy of The Chinese Academy of Scienee, Jiangxi Province, Lushan 332900, China）
Abstract:
The spatial distribution pattern of Adiantum reniforme var. sinense was analyzed by Ripley＇ s Kfunction. Population patterns and spatial association of A. reniforme var. sinense depend on spatial scales and individual plant sizes, and so do their intraspecific relationships. On the scales less than 4. 5 m, the population is usually characterized by cl distribution, and their spatial association is considerably obviously positive. By contrast, if the scales enlarge randomly, and their spatial association will loosen clumped beyond some points （5 m）, the plants will disperse greatly. Mature individuals are more likely to follow distribution than those small ones. The spatial association between plants will turn weak if their size differences are large. The abundant seedlings in the plot implied regeneration of A. reniforme var. sinense was moderate, but the seedlings distributed unevenly. Finally, according to the habitat of A. reniforme var. sinense in nature, we clear-cutting, increasing properly proposed a few strategies for its preservation which included reducing shrub coverage and decreasing herb coverage.[著者文摘]
Key words:
The Three-Gorge Reservoir Region; Adiantum reniforme var. sinense; Point pattern analysis; Distribution pattern
基金资助:
国家自然科学基金资助项目（30570331,30670368）;国务院三峡工程建设委员会资助项目（SX2002-007）.
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