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| 南盘江流域云南松径向生长对气候暖干化的响应 | |
| 引用本文： | 申佳艳,李帅锋,黄小波,雷志全,施兴全,苏建荣.南盘江流域云南松径向生长对气候暖干化的响应[J].植物生态学报,2019,43(11):946-958. |
| 作者姓名： | 申佳艳 李帅锋 黄小波 雷志全 施兴全 苏建荣 |
| 作者单位： | 中国林业科学研究院资源昆虫研究所, 昆明 650224 曲靖市国有海寨林场, 云南曲靖 655000 |
| 基金项目： | 云南省科技创新人才计划目(2018HC013) |
| 摘 要： | 全球气候变暖背景下, 西南地区气候呈现出明显的暖干化特征, 但区域优势树种云南松(Pinus yunnanensis)对气候暖干化的响应存在不确定性。该研究根据树木年代学方法选择研究区域87株云南松样本进行树芯采集, 构建云南松树轮年表, 结合1952-2016年的气温和降水等气象资料, 利用响应分析、多元回归分析以及滑动相关分析等方法研究了影响南盘江流域云南松径向生长的关键气候因子及其对气候暖干化的响应规律。研究结果表明: 1985年以来, 研究区域气候暖干化特征明显, 气温上升和降水量下降的速率是1984年前的5和6倍, 年平均气温、年平均最高气温、年平均最低气温的上升速率为0.044、0.041和0.050 ℃·a -1, 年降水量的下降速率为 6.02 mm·a -1。气候暖干化使云南松的生长对温度响应的敏感度降低, 对水分响应的敏感度增强, 气温的解释率由暖干化前的44.95%下降到21.97%, 水分的解释率由暖干化前的55.05%上升到78.03%。暖干化增强了当年气候因子对径向生长的影响, 减弱了上年气候因子的影响, 与径向生长显著相关的当年气候因子增加了3个, 当年气候因子对径向生长的解释率增加了16.05%。暖干化减弱了云南松生长的“滞后效应”, 气候变化对树木生长影响的时效性增强。在5-7月和9-11月, 气候变暖使径向生长与气温、水分的响应关系变得不稳定。该研究可为气候暖干化区域云南松林的经营、管理以及区域气候重建提供理论依据和基础数据。 |
| 关 键 词： | 云南松 年轮 气候暖干化 气候响应 稳定性 |
| 收稿时间： | 2019-07-02 |
Radial growth responses to climate warming and drying in Pinus yunnanensis in Nanpan River Basin |
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| SHEN Jia-Yan,LI Shuai-Feng,HUANG Xiao-Bo,LEI Zhi-Quan,SHI Xing-Quan,SU Jian-Rong.Radial growth responses to climate warming and drying in Pinus yunnanensis in Nanpan River Basin[J].Acta Phytoecologica Sinica,2019,43(11):946-958. | |
| Authors: | SHEN Jia-Yan LI Shuai-Feng HUANG Xiao-Bo LEI Zhi-Quan SHI Xing-Quan SU Jian-Rong |
| Affiliation: | Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, China State-owned Haizhai Forest Farm of Qujing, Qujing, Yunnan 655000, China |
| Abstract: | Aims Forests in Nanpan River Basin are under severe effects by drought because of the warming and drying climate. As the typical dominant coniferous forests in this region, Pinus yunnanensis forests occur over a broad range and present a good potential for dendroclimatological studies. However, little is known about the relationship between radial growth and climate in this tree species. Our objectives were to determine the constraining factors of radial growth and examine the stability of growth-climate relationships in P. yunnanensis in response to climate warming and drying.Methods We used standardized dendrochronological method, combined with trend analysis of meteorological data from 1952 to 2016, to study the effects of climate variabilities on the radial growth in P. yunnanensis. We extracted increment cores from 87 trees and measured annual ring-width. Response analysis and multiple regression analysis were used to determine the constraining factors of radial growth. Moving correlation was used to detect the stability of growth-climate response.Important findings The annual mean temperature (Tmp), mean maximum temperature (Tmx), and mean minimum temperature (Tmn) in the research region have increased at a rate of 0.044, 0.041 and 0.050 °C·a -1, respectively. The annual total precipitation showed a significant decreasing trend at a rate of 6.02 mm·a -1 during 1985-2016. The growth of P. yunnanensis trees was less sensitive to temperature but more sensitive to moisture; prior to and after warming and drying period, the explainable variance of radial growth by temperature decreased from 44.95% to 21.97%, and that by moisture-related factors increased from 55.05% to 78.03%. Warming and drying climate enhanced the influence of climatic factors on radial growth of the current year and weakened the influence of climatic factors of the previous year, while increasing the climatic factors of the current year significantly affecting radial growth by three and explanation rate by 16.05%. The “hysteresie effect” weakened and the effects of climate change on growth became more promptly. The growth-climate relationship in P. yunnanensis could become more moisture sensitive under a warming and drying climate. Tree growth and forest productivity of P. yunnanensis in the Nanpan River Basin is likely to decline if the warming and drying climate trend continues. |
| Keywords: | Pinus yunnanensis" target="_blank">Pinus yunnanensis')">Pinus yunnanensis annual rings" target="_blank">annual rings')"> annual rings climate warming and drying" target="_blank">climate warming and drying')">climate warming and drying climate response" target="_blank">climate response')">climate response stability" target="_blank">stability')">stability |
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