增温对高寒草甸群落凋落物质量动态变化的影响

林巧燕1; 4; $22; $21; $21; 4; $21; 4; $21; 4; $23*

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增温对高寒草甸群落凋落物质量动态变化的影响
林巧燕1，4，徐广平2，苏爱玲1，段吉闯1，4，张振华1，4，罗彩云1，4，汪诗平3*
1.中国科学院西北高原生物研究所高原适应与进化重点实验室，西宁 810008;2.广西壮族自治区中国科学院　广西植物研究所，广西桂林 541006;3.中国科学院青藏高原研究所高寒生态学和生物多样性实验室，北京 100085;4.中国科学院研究生院，北京 100049

摘要:

为了解未来增温条件下，青藏高原高寒草甸凋落物质量如何变化，将有助于增强对高寒草甸生态系统碳源／汇效应的认识。该文通过定位可控的增温试验平台，动态监测了凋落物生物量及其质量的变化。结果表明：增温显著地促进了凋落物的分解速率（F=35.757，P＜0.001），降低了凋落物中的C、N含量及其C/N比，但提高了凋落物中的P含量；随着生长季的推移，增温显著增加了木质素含量及木质素／N的比例。说明未来增温条件下，高寒草甸生态系统的C、N循环过程将可能加快。

关键词: 增温凋落物碳含量氮含量磷含量纤维素木质素

DOI：

分类号:Q948.11

Fund project:

Response of litter quality to warming in the alpine meadow on the Tibetan Plateau

LIN QiaoYan1，4， XU GuangPing2， SU AiLing1， DUAN JiChuang 1，4， ZHANG ZhenHua1，4， LUO CaiYun1，4， WANG ShiPing3*

1.Key Laboratory of Adaptation and Evolution of Plateau Biota， Haibei Alpine Meadow Ecosystem Research Station， Northwest Institute of Plateau Biology， Chinese Academy of Sciences， Xining 810008， China;2. Guangxi Institute of Botany， Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences， Guilin 541006， China;3.Institute of Tibetan Plateau Research， Chinese Academy of Sciences， Beijing 100085， China;4.Graduate University， Chinese Academy of Sciences， Beijing 100049， China

Abstract:

Understanding how the response of litter quality to warming will increase our ability to predict the change of carbon sink/source of alpine meadow ecosystem under future warming condition. We found that warming(about 15 ℃ enhancement)significantly increased litter decomposition and phosphors concentration，whereas decreased concentrations of carbon and nitrogen，and their ratio in remaining litters. From June to October in 2009，four fields measured results showed that warming significantly promoted the litter decomposition rate(F=35.757，P＜0001). These results suggested that warming would increase carbon/nitrogen cycling processes in the alpine region.

Key words: warming litter carbon nitrogen phosphorus cellulose lignin