摘要
为探究气候因子对藏东南不同海拔高山松径向生长的影响,以藏东南林芝地区低、中、高海拔高山松为研究对象,建立树轮宽度年表,分析其与各月气候因子的相关性及其对干旱年份的适应能力。结果表明:研究区低海拔高山松径向生长与上年7月、当年6月最高气温以及上年11月降水量呈显著正相关(P<0.05),而与上年11月平均气温和最高气温呈显著负相关(P<0.05);中海拔高山松径向生长与上年9月和当年1月最低气温、当年1月和4—5月降水量呈显著正相关(P<0.05),而与当年4—5月最高气温呈显著负相关(P<0.05);高海拔高山松径向生长与上年9月、当年5月降水量以及当年7月最高气温呈显著正相关(P<0.05)。中、低海拔高山松径向生长对生长季温度的敏感性增强,对降水量的敏感性较为稳定,高海拔地区高山松径向生长对温度的敏感性减弱。中、高海拔地区高山松对干旱的抵抗力高于低海拔地区,中、高海拔地区高山松的恢复力总体上低于低海拔地区,3个海拔高山松对干旱的适应能力较强。
This study aims to investigate the influences of climatic factors on the radial growth of Pinus densata at different altitudes in southeastern Xizang.A chronology of tree-ring width was established for the P.densata growing at low,medium,and high altitudes in Linzhi,southeastern Xizang to analyze its correlation with monthly climatic factors and the adaptability to drought years.The results showed that the radial growth of low-altitude P.densata in the study area was positively correlated with the maximum air temperatures in July of the previous year and June of the current year and the precipitation in November of the previous year(P<0.05),while it was negatively correlated with the average and maximum air temperatures in November of the previous year(P<0.05).The radial growth of medium-altitude P.densata was positively correlated with the minimum temperatures in September of the previous year and January of the current year(P<0.05)and the precipitation in January and April-May of the current year(P<0.05),while it was negatively correlated with the maximum temperature in April-May of the current year(P<0.05).The radial growth of high-altitude P.densata was positively correlated with the precipitation in September of the previous year and May of the current year and the maximum temperature in July of the current year(P<0.05).The radial growth of low-and medium-altitude P.densata showed enhanced sensitivity to temperatures and stable sensitivity to precipitation during the growing season,and that of high-altitude P.densata demonstrated weakened sensitivity to temperatures.The medium-and high-altitude P.densata demonstrated higher resistance to drought and lower resilience than low-altitude P.densata.P.densata at all the three altitudes showcased strong adaptation to drought.
作者
蔡苗
李雅
卢杰
李江荣
CAI Miao;LI Ya;LU Jie;LI Jiangrong(Institute of Xizang Plateau Ecology,Xizang Agricultural and Animal Husbandry University,Linzhi,Xizang 860000,China;Key Laboratory of Forest Ecology in Xizang Plateau,Ministry of Education,Linzhi,Xizang 860000,China)
出处
《森林与环境学报》
北大核心
2025年第4期395-402,共8页
Journal of Forest and Environment
基金
西藏农牧学院人才队伍建设项目“藏东南森林生态系统碳源/汇特征及碳库影响因素研究”(XZNMXYRCDWJS-2024-05)
西藏高原森林生态教育部重点实验室研究生创新计划项目“色季拉高山松径向生长对气候变化的分异响应”(XZA-JYBSYS-2023-17)
西藏自治区科技计划项目“藏东南高山松长期生态学观测研究-西藏林芝高山森林生态系统国家野外科学观测研究站(科技创新基地)”(XZ202301JD0001G)。
关键词
藏东南
高山松
海拔
径向生长
气候
干旱
southeastern Xizang
Pinus densata
altitude
radial growth
climate
drought
