西藏色季拉山西藏红杉径向生长对气温和降水波动的响应  

Response of Radial Growth of Larix griffithii to Temperature and Precipitation Fluctuation in Tibet Shergyla Mountain

作　　者：于德水 卢杰[1,2,3,4] 张萌 张新生 YU De-shui;LU Jie;ZHANG Meng;ZHANG Xin-sheng(Institute of Tibet Plateau Ecology,Tibet Agricultural&Animal Husbandry University,Nyingchi,Tibet 860000,China;Key Laboratory of Forest Ecology in Tibet Plateau(Tibet Agricultural&Animal Husbandry University),Ministry of Education,Nyingchi,Tibet 860000,China;Lin Zhi National Forest Ecosystem Observation&Research Station of Tibet,Nyingchi,Tibet 860000,China;Key Laboratory of Alpine Vegetation Ecological Security in Tibet,Nyingchi Tibet 860000,China)

机构地区：[1]西藏农牧学院高原生态研究所,西藏林芝860000 [2]西藏高原森林生态教育部重点实验室,西藏林芝860000 [3]西藏林芝高山森林生态系统国家野外科学观测研究站,西藏林芝860000 [4]西藏高寒植被生态安全重点实验室,西藏林芝860000

出　　处：《林业科学研究》2023年第1期91-99,共9页Forest Research

基　　金：科技部国家野外科学研究观测站(生态系统)运行补助项目(2021—2025);西藏高寒植被生态安全重点实验室研究生开放基金(STAQ-2021Y-3)。

摘　　要：[目的]基于色季拉山地区特有树种西藏红杉年轮样芯,研究西藏红杉径向生长对气温和降水量的波动响应。[方法]利用树木年代学的方法,结合TASP-Win及ARSTAN程序建立标准年表,采用Pearson及bootstrap的计算方式将年轮宽度指数与1961—2020年气温及降水分别进行相关分析。[结果]径向生长在气温波动前后存在较大的差异。在气温波动前西藏红杉与前一年8月,当年1月及6月平均气温呈正相关(P<0.05),与前一年9—10月及12月平均降水呈正相关,与前一年8月降水呈负相关,与1月至12月的相对湿度呈显著正相关(P<0.01)。在气温发生波动后,与当年3—12月平均气温呈负相关,与前一年8月及当年6月降水为显著正相关。[结论]藏东南地区的气候条件极为特殊,气候的波动导致水热条件发生变化是限制西藏红杉径向生长的主要原因,在非生长季,气温短暂的变化对树木径向生长同样有着显著的影响。[Objective]To study the response of radial growth of Larix griffithii Hoof to temperature and precipitation based on the annual ring core of L.griffithii collected in the Shergyla Mountain.[Method]The standard chronology was established by using the tree chronology method combined with TASP-Win and ARSTAN programs.Pearson and bootstrap calculation methods were used to analyze the correlation between ring width index and temperature and precipitation from 1961 to 2020.[Result]There were significant differences in radial growth before and after temperature fluctuation.Before the temperature fluctuation,the radial growth was positively correlated with the average temperature in January and June of the year and August of the previous year(P<0.05).It was positively correlated with the average precipitation from September to October and December of the previous year and negatively correlated with that in August of the previous year.And It was significantly positively correlated with the relative humidity from January to December(P<0.01).After the temperature fluctuation,the radial growth was negatively correlated with the average temperature from March to December and positively correlated with the precipitation in August and June of the previous year.[Conclusion]The climatic conditions in Southeast Tibet are extremely special.The uneven hydrothermal conditions caused by climate fluctuations is the main reason for the radial growth change of L griffithii.The short-term change of temperature in the non-growing season also has a significant indigenous impact on the radial growth of trees.

关 键 词：西藏红杉 树木年轮 气候波动 色季拉山 

分 类 号：S718.45[农业科学—林学]