Treeline dynamics in response to climate change in the Min Mountains, southwestern China.
Treeline dynamics in response to climate change in the Min Mountains, southwestern China.
复制标题
中国西南部岷山地区林线动态对气候变化的响应
DOI：
10.1186/1999-3110-54-15
复制
发表时间：
2013-12
影响因子：
3.4
通讯作者：
Li JQ
中科院分区：
文献类型：
--
作者：
Zhao ZJ;Shen GZ;Tan LY;Kang DW;Wang MJ;Kang W;Guo WX;Zeppel MJ;Yu Q;Li JQ
研究背景冷杉是青藏高原东缘森林生态系统的优势植物种，该地区的林线受气候影响很大。通过对王朗自然保护区岷山西北和东南坡林线交错带的冷杉树轮年表和树龄结构进行研究，考察了近几十年来林线对气候变化的响应动态。结果在西北坡，相关分析表明，径向生长与当年1月份降水量和4月份月平均气温呈显着正相关，与前8月份月平均气温呈显着负相关。东南方向径向生长与前7、8月份月平均气温呈显着负相关。结论两方面径向生长对气候变化的不同响应可能主要受微环境条件的影响。此次招聘得益于当前四、七、九月份西北地区的温暖气温。西北坡的径向生长和补充对气候变化的反应相似。由于与东南方茂密的竹林竞争，招募受到很大限制。
BackgroundAbies faxonianais the dominant plant species of the forest ecosystem on the eastern edge of Qinghai-Tibet Plateau, where the treeline is strongly defined by climate. The tree-ring chronologies and age structure ofAbies faxonianawere developed in the treeline ecotones on the northwestern and southeastern aspects of the Min Mountains in the Wanglang Nature Reserve to examine the treeline dynamics of recent decades in response to climate change.ResultsOn the northwestern aspect, correlation analysis showed that the radial growth was significantly and positively correlated with precipitation in current January and monthly mean temperature in current April, but significantly and negatively correlated with monthly mean temperature in previous August. On the southeastern aspect, the radial growth was significantly negatively correlated with monthly mean temperature in previous July and August.ConclusionsThe different responses of radial growth to climatic variability on both the aspects might be mainly due to the micro-environmental conditions. The recruitment benefited from the warm temperature in current April, July and September on the northwestern aspect. The responses of radial growth and recruitment to climatic variability were similar on the northwestern slope. Recruitment was greatly restricted by competition with dense bamboos on the southeastern aspect.