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杨绕琼,范泽鑫,李宗善,温庆忠.滇西北玉龙雪山不同海拔云南松(Pinus yunnanensis)径向生长对气候因子的响应.生态学报,2018,38(24):8983~8991 本文二维码信息
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滇西北玉龙雪山不同海拔云南松(Pinus yunnanensis)径向生长对气候因子的响应
Radial growth of Pinus yunnanensis at different elevations and their responses to climatic factors in the Yulong Snow Mountain, Northwest Yunnan, China
投稿时间:2018-05-31  修订日期:2018-11-12
DOI: 10.5846/stxb201805311214
关键词树木年轮  气候响应  海拔梯度  干旱  云南松
Key Wordstree rings  climate response  elevation gradient  drought  Pinus yunnanensis
基金项目国家自然科学基金面上项目(31770533);国家重点研发计划第五课题(2016YFC0502105);云南省森林资源年度监测项目
作者单位E-mail
杨绕琼 中国科学院西双版纳热带植物园热带森林生态学重点实验室, 勐腊 666303
中国科学院大学, 北京 100049 
 
范泽鑫 中国科学院西双版纳热带植物园热带森林生态学重点实验室, 勐腊 666303 fanzexin@xtbg.org.cn 
李宗善 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085  
温庆忠 云南省林业调查规划院, 昆明 650051  
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摘要:
云南松(Pinus yunnanensis)是重要的造林树种,在我国西南地区广泛分布。研究不同海拔云南松径向生长对气候变化的响应,有助于了解气候变化背景下云南松的敏感性和适应性。在滇西北丽江玉龙雪山不同海拔采集了云南松树木年轮样品,采用传统的树木年轮方法制作了不同海拔云南松树轮宽度标准化年表,并分析了不同海拔云南松径向生长与气候因子的相关性。结果表明:1)低海拔样点云南松具有较快的年平均生长速率。2)不同海拔云南松对气候因子的响应模式一致,树轮宽度与当年5-6月的降水量、帕尔默干旱指数(PDSI)和相对湿度呈正相关,与同期温度呈负相关。3)不同海拔的云南松径向生长对气象因子的响应程度不一样,即低海拔样点云南松树轮宽度与当年5月份的干旱指数、相对湿度、降水量相关系数较高;而高海拔样点的云南松树轮宽度与5-6月的降水、相对湿度、干旱指数的相关系数较低。研究表明春末夏初的水分条件是玉龙雪山云南松径向生长的主要限制因子,且低海拔地区云南松生长受水分限制更为严重,区域气候变暖和干旱化趋势可能对低海拔地区云南松的生长产生持续的负面效应。研究结果可为探讨气候变化下云南松的适宜分布区、以及云南松人工林的经营和可持续管理提供参考。
Abstract:
Pinus yunnanensis is an important commercial timber tree species in southwestern China. Investigation on the radial growth of P. yunnanensis at different elevations and their responses to climatic factors is essential for understanding climatic sensitivity and adaptation of this economical important species under global climate change. We collected tree increment cores of P. yunnanensis from two elevational sites in the Yulong Snow Mountain, northwest Yunnan Province, China. Two ring-width standard dendrochronologies were developed using traditional dendrochronological techniques and their growth-climate correlations were analyzed. The results showed that 1) P. yunnanensis at lower elevation site grew faster than those at higher elevation site. 2) Radial growth of P. yunnanensis correlated positively with precipitation, relative humidity, and the Palmer Drought Severity Index (PDSI), but correlated negatively with air temperatures during the early growing season from May to June. 3) The sensitivity of radial growth of P. yunnanensis to moisture availability differed between different elevations, with higher positive correlations between tree-ring chronology and precipitation, relative humidity, and PDSI at lower elevation than that of higher elevation. These results demonstrated that radial growth of P. yunnanensis in the Yulong Snow Mountain was mainly limited by moisture availability during the late spring and early summer season. Regional warming and drying climate may have negative effects on tree growth of P. yunnanensis, especially at low elevations. Our results provide important implications for understanding potential distribution shifts of P. yunnanensis under future climate changes, as well as sustainable management of pine plantations in southwest China.
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