草业科学2017，Vol.34Issue(3)：449-455,7.DOI:10.11829/j.issn.1001-0629.2016-0329
放牧强度对高寒草甸群落碳氮磷化学计量特征的影响
Effects of grazing intensity on the ecological stoichiometry characteristics of alpine meadow
摘要
Abstract
Ecological stoichiometry characteristic is important for the stability of alpine meadow ecosystem;however,its response to grazing is still not clear.Grassland sample plots with different grazing intensity,including fencing (CK),light grazing (LG),moderate grazing (MG),and heavy grazing (HG),were established in the Haibei alpine meadow in 2011.These plots were chosen to investigate the effects of grazing intensity on aboveground vegetation productivity,carbon (C),nitrogen (N) and phosphorus (P) content of leaves of the vegetation community from May to September in 2014.The results showed that MG could significantly improve the aboveground productivity and proportion of Gramineae plants.Variation in the C content was maximum under MG treatment,supporting the hypothesis of intermediate disturbance.HG could significantly improve the N content.There was no significant effect of grazing on the P content.Fencing was beneficial to the turnover of N and P.The results indicated that moderate grazing was helpful for improving the productivity of the alpine meadow and fencing could enhance the cycle of N and P by changing the dominant species of the community.关键词
放牧强度/高寒草甸/群落/碳/氮/磷Key words
grazing intensity/alpine meadow/community/C/N/P分类
农业科技引用本文复制引用
李红琴,毛绍娟,祝景彬,杨永胜,贺慧丹,李英年..放牧强度对高寒草甸群落碳氮磷化学计量特征的影响[J].草业科学,2017,34(3):449-455,7.基金项目
国家自然基金项目(31300385、31270523) （31300385、31270523）
青海省国际科技合作项目(2015-HZ-804) （2015-HZ-804）
