Patterns and dynamics of tree-line response to climate change in the eastern Qilian Mountains, northwestern China
Patterns and dynamics of tree-line response to climate change in the eastern Qilian Mountains, northwestern China
复制标题
东祁连山林线对气候变化的响应格局及动态
DOI：
10.1016/j.dendro.2011.05.002
复制
发表时间：
2012-01-01
影响因子：
3
通讯作者：
Fang, Keyan
中科院分区：
文献类型：
--
作者：
Gou, Xiaohua;Zhang, Fen;Fang, Keyan
林线生态交错带受到强烈的气候限制，可作为气候变化的潜在监测器。我们利用青藏高原东北部祁连山东段的两个普氏刺柏林线点的年轮生长增量、树木密度和树龄结构数据来检测树木生长和种群动态对气候变化的响应。高温有利于树木生长，并与林线树木密度增加和林线位置提前相关。环宽度与当前和之前六月、七月和八月的月平均气温之间存在显着的正相关关系。小冰期之后，这两个地点的树木补充量开始迅速增加，但从 20 世纪 70 年代开始减少。树木的数量与温度的变化相一致。小冰期之后的变暖趋势有利于树木密度的增加和林线的推进。大多数树木是在 1931 年至 1970 年期间建立的，这与树木的快速径向生长非常吻合。 (C) 2011 年意大利树木年代研究所。由爱思唯尔有限公司出版。版权所有。
Tree-line ecotones are strongly climatically limited and serve as potential monitors of climate change. We employed annual growth increment from tree-rings, and tree density and age structure data derived from two Juniperus przewalskii tree-line sites in the eastern part of the Qilian Mountains, northeastern Tibetan Plateau, to detect the responses of tree growth and population dynamics to climate change. High temperature favors tree growth and is associated with increased tree density at tree-line, and an advance in tree-line position. Significantly positive correlations were found between ring-width and mean monthly air temperatures in current and previous June, July and August. Tree recruitment began to increase rapidly at the two sites after the Little Ice Age, but then decreased starting in the 1970s. The number of trees established coincides with temperature changes. The warming trend after the Little Ice Age favors increases of tree density and an advance of tree-line. The majority of trees established during the period of 1931-1970, which coincides well with the rapid radial growth of the trees. (C) 2011 Istituto Italian di Dendrocronologia. Published by Elsevier GmbH. All rights reserved.