生态学杂志2011，Vol.30Issue(12)：2692-2699,8.
不同放牧强度下克氏针茅(Stipa krylovii)草原的根系特征
Root characteristics under different grazing intensities in Stipa krylovii steppe
摘要
Abstract
Taking three succession plant communities in Hulunbeier Stipa krylovii steppe under different grazing intensities as test objects, this paper studied the underground biomass and root morphological characteristics of the communities and their constructive species. With increasing grazing intensity, both the community species composition and the root functional group types tended to be simplified. The underground biomass of the three communities presented a T-shape spatial distribution. The constructive species of the communities under different grazing intensities had an obvious substitution, with S. Krylovii, Cleistogenes squarrosa and Allium polyrhizum as the constructive species under light, moderate and heavy grazing, and the root/shoot ratios of the constructive species decreased with increasing grazing intensity, being 0.47, 1.0, and 4. 1 under light, moderate and heavy grazing, respectively. The root number, root volume, root biomass, specific root length, and root length density also varied with different grazing intensities. Moreover, the root/shoot ratio and the specific root length showed a significant correlation with the content of soil available nitrogen (P<0.05).关键词
克氏针茅草原/放牧强度/根系类型/根系功能群类型配比Key words
Stipa krylovii steppe/ grazing intensity/ root type/ partitioning ratio of root functional groups分类
生物科学引用本文复制引用
雒文涛,乌云娜,张凤杰,霍光伟,吕建洲..不同放牧强度下克氏针茅(Stipa krylovii)草原的根系特征[J].生态学杂志,2011,30(12):2692-2699,8.基金项目
国家自然科学基金项目(30870423、31170402)、中央高校基本科研业务费专项(DC10050101)和国家重点基础研究发展计划项目(2009CB421308)资助. （30870423、31170402）
