摘要
为揭示滇西北高原树木径向生长与气候关系的规律,该研究分别在玉龙雪山采集高山松(Pinus densata)、云南松(Pinus yunnanensis)和云南铁杉(Tsuga dumosa)年轮样本,建立3个树种树轮宽度差值年表,将年轮指数与气候因子进行响应分析和冗余分析,以明确影响玉龙雪山树木径向生长的主要气候因子,为该区域森林生态系统的管理保护提供依据,并为探讨气候变化背景下滇西北森林动态提供依据。结果表明:(1)所建立的3个树种树轮宽度差值年表具有较少的低频变化,且离散程度较低、逐年变化共性较高,可代表采样点树木的年轮特征;高山松、云南松和云南铁杉差值年表的平均敏感度依次分别为0.21、0.22和0.17,样本总体代表性分别为0.96、0.96和0.94,均高于0.85的阈值,说明年表中信息具有代表性。(2)响应分析结果显示,高山松径向生长与当年2月的降水量呈显著正相关关系;云南松径向生长与当年5月的平均气温和最高温呈显著负相关关系,与当年10月平均气温呈显著正相关关系;云南铁杉径向生长与当年1月和5月的降水、当年10月相对湿度均呈显著正相关关系,与当年5月最高气温呈显著负相关关系。(3)冗余分析结果显示,当年1月降水、2月降水、5月干旱指数对3个树种均具有促进作用,且5月干旱指数的显著相关性最强;当年10月降水的增加有利于高山松和云南铁杉的径向生长,但对云南松径向生长具有抑制作用。研究认为,当年冬季降水、5月湿润条件以及10月降水是影响玉龙雪山3个树种径向生长的重要环境因子;若干暖化趋势加剧,将不利于滇西北高原3个树种的生长,从而影响区域森林生态系统结构和功能。
In order to reveal the relationship between tree radial growth and climate in the Northwestern Yunnan Plateau,the study collected tree-ring samples of Pinus densata,Pinus yunnanensis and Tsuga dumosa on Yulong Snow Mountain,established a chronology of the difference between the ring width of three tree species,and analyzed the response and redundancy analysis of the ring index and climatic factors to identify the main climatic factors affecting the radial growth of trees in Yulong Snow Mountain.It provides a basis for the management and protection of forest ecosystems in the region,and for exploring the forest dynamics of Northwest Yunnan under the background of climate change.The results showed that:(1)the established chronology of the width difference between the three tree species has few low frequency changes,and the degree of dispersion is low,and the commonality of the year-on-year change is high,which can represent the annual ring characteristics of the trees at the sampling point;the mean sensitivity of the differential chronology of P.densata,P.yunnanensis and T.dumosa is 0.21,0.22 and 0.17,respectively,and the overall representativeness of the sample is 0.96,0.96 and 0.94,respectively,all of which are higher than the threshold of 0.85,indicating that the information in the chronology is representative.(2)In response function analysis,the radial growth of P.densata was significantly and positively correlated with the current February precipitation.The radial growth of P.yunnanensis was significantly and negatively correlated with the mean temperature and maximum temperature of current May,and was significantly and positively correlated with the mean temperature of current October.The radial growth of T.dumosa was significantly and positively correlated with the precipitation of current January and May and the relative humidity of current October,and was significantly and negatively correlated with the maximum temperature of current May.(3)The results of the redundancy analysis showed that the precipitation of current January and February,and The Palmer Drought Severity Index(PDSI)of current May promoted the radial growth of three species,and the correlation coefficient of PDSI was the strongest.The increase in precipitation of current October enhanced the radial growth of P.densata and T.dumosa,while inhibited P.yunnanensis growth.The study believes that the winter precipitation,moisture conditions of May and October precipitation in the current year were main environmental factors affecting the radial growth of three species on Yulong Snow Mountain.If warming and drying trends intensified,it will not be conducive to the growth of the three tree species in the northwest Yunnan plateau,thereby affecting the structure and function of the regional forest ecosystem.
作者
李嘉宁
张贇
田昆
曹仁杰
覃鑫浩
LI Jianing;ZHANG Yun;TIAN Kun;CAO Renjie;QIN Xinhao(National Plateau Wetlands Research Center/College of Wetlands, Southwest Forestry University, Kunming 650224, China;2Academy of Forestry Grassland Inventory and Planning, National Forestry and Grassland Administration, Beijing 100714, China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2022年第3期473-480,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31600395)
云南省高原湿地科学创新团队项目(2012HC007)
云南省教育厅科学研究基金(2018Y118)。
关键词
树木年轮
气候响应
阳性树种
横断山区
径向生长
dendrochronology
climate response
shade-intolerant species
Hengduan Mountains
radial growth
