生态学杂志2013，Vol.32Issue(2)：271-278,8.
甘肃臭草型退化草地优势物种格局控制关系
Pattern-controlling relationships of dominant species in degraded grassland of Melica przewalskyi
摘要
Abstract
In this paper, the methods of spatial point pattern and Ripley' s K function were adopted to study the spatial distribution, spatial association, and pattern-controlling relationships between Melica przewalskyi and Stipa krylovii in degraded alpine grassland in the upper reaches of Shiyang River, western China, aimed to detect the interspecific pattern-controlling relationships of dominant species during retrogressive succession. Five sampling plots were installed according to the time series, i. e. , patch not formed (CK) , patch formed (A) , patch spread (B) , patch stable ( C ) , and patch degraded ( D). During the process of retrogressive succession ( from CK to D) , the spatial distribution pattern of S. krylovii transferred from random to aggregative, and the association between M. przewalskyi and S. krylovii transferred from significant negative to not significant, with the significance decreased after an initial increase. In plots A, B, and C, M. przewalskyi showed pattern-controlling relationships to S. krylovii at 0-15, 0-12, and 0-10 cm scales, but the pattern-controlling relationships did not appear at plots CK and D. By altering microhabitats, the species with bigger size, larger scale, and stronger competition capability forced other species changed their distribution pattern and presented regular distribution, and thus, formed pattern-controlling relationships to other species.关键词
甘肃臭草/阿尔泰针茅/格局控制关系/空间关联性/石羊河上游Key words
Melica przewalskyi/Stipa krylovii/pattern-controlling relationship/spatial associa-tion /upper Shiyang River分类
生物科学引用本文复制引用
高福元,赵成章..甘肃臭草型退化草地优势物种格局控制关系[J].生态学杂志,2013,32(2):271-278,8.基金项目
国家自然科学基金项目(40971039和91125014)、甘肃省科技支撑计划项目(1011FKCA157)和甘肃省高校基本科研业务费项目资助. （40971039和91125014）
