Response of radial growth of Pinus massoniana at different ages to climate change in Jinyun Mountain, Chongqing
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摘要:
为探究气候变化背景下不同年龄马尾松(Pinus massoniana)生长规律及其对气候变化的响应, 本研究以缙云山不同年龄马尾松为分析对象, 运用树木年代学原理及方法, 建立小龄树(1971~2020年)和大龄树(1940~2020年)马尾松树轮宽度年表, 并计算胸径处断面积生长量(BAI); 分析近40年来不同年龄马尾松生长变化状况及树轮宽度年表与气象因子之间的关系。结果表明: 气候变暖背景下, 不同年龄马尾松生长均受到一定阻碍, 1983~2013年间, 大、小龄树BAI显著下降。与1980~2020年间气候因子的相关分析表明, 两龄级马尾松生长均受到第二次高生长期温度的影响, 具体表现为与当年9月平均最高温, 上年及当年9月平均温呈显著负相关; 小龄树马尾松生长还受限于生长季降水条件, 对降水更敏感; 表现为与当年第二次高生长期(9~10月)、上年5月、10月及当年10月降水呈显著正相关。研究结果为未来气候变暖背景下马尾松林的合理经营与管理提供了一定的理论依据。
Abstract:In order to investigate the growth patterns of Pinus massoniana of different ages and their responses to climate change against the background of climatic changes, this study used Pinus massoniana of different ages in Jinyun Mountain(29°41'~29°52'N, 106°17'~106°24'E)of Chongqing as the research object. The cores of 62 young and 58 old Pinus massoniana trees were collected using the micro tree core technique. Dendrochronology principles and techniques were used to establish a chronology of ring width of young trees(1971~2020A.D.)and older trees(1940~2020A.D.), and to calculate the basal area increment(BAI)at the chest diameter. Analyses were conducted on the alterations in Pinus massoniana BAI at different ages. The results demonstrate that Pinus massoniana's growth at different ages has been somewhat slowed by the effects of global warming. Between 1983 and 2013, the BAI of older and young trees fell considerably while older trees were more susceptible and showed a downward growth trend. The link between the chronology of tree ring width and meteorological conditions has been studied from 1980 to 2020. In particular, there were significant negative correlations between the chronology of tree ring width and the average temperature of the previous year, September of the same year, and the average maximum temperature in September and the second high growth period(from September to October)of the same year. In contrast, the chronology of tree ring width were significantly positively correlated with the precipitation during the second peak growth period(September to October)of the same year. During the drowing season, the growth of young Pinus massoniana was likewise constrained by precipitation circumstances and was more susceptible to precipitation. There was a significantly positive correlation between the performance and the second hypergrowth period's precipitation(September to October), as well as the precipitation in May, October, and October of the preceding year. The results of the study provide a particular theoretical framework for managing Pinus massoniana forests rationally in light of projected global warming.
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Key words:
- age /
- basal area increment /
- Pinus massoniana /
- ring width indices
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图 3
采样点马尾松断面积生长量(BAI)序列
Figure 3.
The sequence of Pinus massoniana basal area increment(BAI)at sampling points
图 4
小龄树和大龄树年轮宽度标准年表(年龄宽度指数)和样本量
Figure 4.
Standard tree-ring chronology and sample size of young and old trees
图 5
年轮宽度标准年表与逐月气候因子的相关分析结果
Figure 5.
Correlation analyses of response function between the standard chronologies and the monthly climate factors. Month P in the figure represents the previous year, and *represents the significant correlation reaching the level of 0.05; (a), (b), (c) and (d) represent mean temperature, mean minimum temperature, mean maximum temperature and precipitation, respectively
图 6
树轮宽度标准年表与生长季气候因子的相关分析结果
Figure 6.
Correlation analyses between the standard chronologies and the growing season climate factors. In the figure, p11~p12, c3~c5, c7~c8, c9~c10 and c11~c12 respectively represent the last growth stage(November-December of the previous year), the first high growth period(March-May of the current year), slow growth(July-August of the current year), the second high growth period(September-October of the current year)and the end of current growth(November December of the current year), respectively.
表 1
采样点概况
Table 1.
Description of sampling sites
年龄组 海拔
(m)纬度 经度 胸径DBH
(cm)样芯数量
(棵)小龄树 821 29°49′N 106°22′E 24.7~44.2 62 大龄树 821 29°49′N 106°22′E 45.5~66.0 58 
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表 2
马尾松年轮宽度年表统计特征*
Table 2.
Statistics of tree ring-width chronologies for Pinus massoniana
统计量 小龄树 大龄树 年表类型 STD RES STD RES 样本量(棵) 35 35 42 42 起止时间(年) 1971~
20201972~
20201940~
20201941~
2020平均敏感度 0.141 0.147 0.161 0.167 标准差 0.212 0.156 0.230 0.166 信噪比 13.279 13.267 14.704 16.411 样本总体代表性 0.930 0.930 0.936 0.943 一阶自相关系数 0.574 0.148 0.632 0.079 第一特征向量解释量(%) 38.20 33.88 31.96 32.74 *STD和RES分别表示马尾松标准年表和差值年表
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