| 放牧强度对高寒草甸群落碳氮磷化学计量特征的影响 |
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| 引用本文： | 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). |
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| 作者姓名： | 李红琴 毛绍娟 祝景彬 杨永胜 贺慧丹 李英年 |
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| 作者单位： | 1. 中国科学院西北高原生物研究所,青海西宁810008;中国科学院高原生物适应与进化重点实验室,青海西宁810008;2. 青海大学环境工程学院,青海西宁,810001;3. 中国科学院西北高原生物研究所,青海西宁810008;中国科学院大学,北京100049 |
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| 基金项目： | 国家自然基金项目，青海省国际科技合作项目 |
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| 摘 要： | 植被生态化学计量特征是高寒草甸生态系统稳定性的基础,但其对放牧管理的响应仍不清楚。为此,以2011年在青海海北高寒矮嵩草(Kobresia humilis)草甸建立的不同放牧强度试验地为研究对象,于2014年植物生长季的5月-9月,通过测定禁牧(对照,CK)、轻度放牧(light grazing,LG)、中度放牧(moderate grazing,MG)和重度放牧(heavy grazing,HG)样地的地上植被生产力和植被群落结构及群落叶片碳(carbon,C)、氮(nitrogen,N)、磷(phosphorus,P)含量,研究放牧强度对高寒草甸群落生态化学计量的影响。结果表明,MG能显著提高地上生物量和优良牧草禾草类植物的生物量比例,C含量的变异均在MG处理下最大,此结果支持了中度干扰理论;重牧能显著提高群落叶片的N含量(P0.05);放牧管理对叶片P含量的影响无明显规律;禁牧有利于系统N和P的周转。本研究结果显示,适度的放牧强度有利于高寒草甸生产力的提高,而禁牧可能通过改变群落优势种增强系统的N、P循环强度。
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| 关 键 词： | 放牧强度 高寒草甸 群落 碳 氮 磷 |
Effects of grazing intensity on the ecological stoichiometry characteristics of alpine meadow |
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| Li Hong-qin,Mao Shao-juan,Zhu Jing-bin,Yang Yong-sheng,He Hui-dan,Li Ying-nian.Effects of grazing intensity on the ecological stoichiometry characteristics of alpine meadow[J].Pratacultural Science,2017,34(3). |
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| Authors: | Li Hong-qin Mao Shao-juan Zhu Jing-bin Yang Yong-sheng He Hui-dan Li Ying-nian |
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| 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. |
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| Keywords: | grazing intensity alpine meadow community C N P |
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