Climatic factors affecting radial growth of Betula ermanii and Betula platypylla in Kamchatka
Climatic factors affecting radial growth of Betula ermanii and Betula platypylla in Kamchatka
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DOI：
10.1139/x09-179
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发表时间：
2010-02-01
影响因子：
2.2
通讯作者：
Hara, Toshihiko
中科院分区：
文献类型：
--
作者：
Dolezal, Jiri;Ishii, Hiroaki;Hara, Toshihiko
径向生长对气候的反应进行了研究，在两个品种的桦树广泛分布在堪察加半岛木芯获得在不同的位置和环境，从上到下的树木线，并从潮湿的海洋网站在太平洋的次大陆内部的半岛。使用堪察加半岛四个最长的气象记录（1920年代至2000年）计算响应函数。桦优势种分布于山地和滨海林地，年轮宽度在高海拔地区（500-600 m）乔木层生长量随6月和7月温暖少雨而增加，随9月和10月前的雨雪降温而减少。B ermanii低海拔乔木层径向生长量随冬季降水量增加而增加，这表明，来自微雪的水分防止了低海拔树木的水分胁迫和可能的干燥。在堪察加半岛内部的一种常见的针叶林物种Benda platyphylla Sukaczev中，夏季低温限制了其分布上限（300-350米）和以云杉为主的凉爽潮湿地点的生长。et Gord在以Lam cajanderu Mayr为主的干燥地点，4月温暖和6月干燥的天气限制了生长。可变响应沿着海拔-大陆性梯度加强了对气候变化对物种性能和地理范围变化的影响进行评估的必要性，站点依赖的分化。
Radial growth responses to climate were studied in two species of birch broadly distributed across Kamchatka Peninsula Wood cores were obtained in different locations and environments, from upper to lower treelines, and from wet maritime sites at the Pacific to the subcontinental interior of the peninsula. Response functions were calculated using the four longest meteorological records (1920s-2000) in Kamchatka. In Betula ermanu Cham, the dominant species in mountains and maritime woodlands, ring width in high-elevation (500-600 m) trees increased with warm and less rainy June and July and decreased with rainy/snowy cool weather during the prior September and October Radial growth in B ermanii low-elevation trees increased with higher winter precipitation, suggesting that water from inching snow prevents water stress and possibly desiccation in low-elevation trees In Benda platyphylla Sukaczev, a common taiga species in interior Kamchatka, low summer temperatures limited growth at its upper distributional limit (300-350 m) and in cool, wet sites dominated by Picea ajanensis Lindl. et Gord On drier sites dominated by Lam cajanderu Mayr growth was limited by warm April and dry June weather. Variable responses along elevation-continentality gradients reinforce the necessity of a site-dependent differentiation for the assessment of impacts of climate change on species performance and geographic range shifts.