祁连山中部祁连圆柏林干扰历史重建
收稿日期: 2024-01-16
录用日期: 2024-05-26
网络出版日期: 2024-05-16
基金资助
国家自然科学基金(32271672)
Reconstruction of disturbance history on Juniperus przewalskii forests in middle Qilian Mountains
Received date: 2024-01-16
Accepted date: 2024-05-26
Online published: 2024-05-16
Supported by
National Natural Science Foundation of China(32271672)
重建区域干扰历史对于了解当地森林健康状况以及有针对性地指导森林管护具有重要意义。然而, 目前关于祁连山森林的干扰历史及主要干扰类型尚不清楚。该研究以主要分布于祁连山阳坡的树种——祁连圆柏(Juniperus przewalskii)为研究对象, 在8个采样点采集其树木年轮样芯并建立树轮宽度标准年表。通过分析气候因子与树轮指数的相关关系, 确定影响该区域祁连圆柏生长的主要气候因子。通过分析每株树木的生长变化率, 识别树木的生长释放和抑制现象, 从而判断干扰发生的时间和空间格局。结果表明冬季气温、夏季水分条件显著影响了祁连圆柏的生长。重建的干扰历史显示, 研究区在1930s、1970s发生过两次区域性的森林干扰事件, 两次干扰事件与冬季极端寒冷、夏季极端干旱密切相关, 与连续的厄尔尼诺事件发生时间相一致。两次干扰事件均显示出干扰在空间上的差异性, 体现出了不同森林抵抗力的差异。研究结果为预防和缓解森林衰退提供了重要参考。
董云焘 , 贾恒锋 , 杨晶 , 李佩轩 , 方欧娅 . 祁连山中部祁连圆柏林干扰历史重建[J]. 植物生态学报, 2024 , 48(8) : 967 -976 . DOI: 10.17521/cjpe.2024.0011
Aims The reconstruction of regional disturbance history provides important information in understanding the health status of local forests and facilitating their management and protection. However, the history and regimes of disturbances in the Qilian Mountains remain poorly reported.
Methods In this study, we explored the disturbance history of Juniperus przewalskii, a dominant tree species on the sunny slope of the Qilian Mountains. Tree-ring cores were collected and the standard chronologies of tree-ring width from eight sites were established. We analyzed the correlation between climate factors and tree-ring index. By calculating the percentage growth change in each tree, we examined whether there had been tree-growth release or suppression, thereby identifying the historical course and spatial pattern of disturbances.
Important findings Winter air temperature and summer moisture conditions significantly affected the growth of the tree species. The reconstruction of disturbance history highlighted two major forest disturbance events that occurred during the 1930s and 1970s in our study area. These events were intimately linked to extreme cold winters and severe summer droughts, coinciding remarkably with the occurrence of El Niño. Both events showed spatial variability in disturbance, reflecting differences in resistance across forests. Our study results offer new perspectives in mitigating forest degradation and enhancing forest management in the future.
Key words： tree ring; growth release; growth suppression; extreme climate; Qilian Mountains
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