Intra-annual wood formation of subtropical Chinese red pine shows better growth in dry season than wet season
Intra-annual wood formation of subtropical Chinese red pine shows better growth in dry season than wet season
复制标题
亚热带红松年内木材形成量旱季生长好于雨季
DOI：
10.1093/treephys/tpy046
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发表时间：
2018-08-01
期刊：
影响因子：
4
通讯作者：
Zhang, Mingfang
中科院分区：
文献类型：
--
作者：
Huang, Jian-Guo;Guo, Xiali;Zhang, Mingfang
中国的亚热带森林在全球固碳方面发挥着至关重要的作用；因此，对这些生态系统的年内木材形成进行精确调查以阐明其背后的机制至关重要。在中国亚热带森林中建立了两个野外实验，每周监测马尾松年内木质部的形成。 2015 年 1 月至 12 月，使用最近开发的微抽样方法。还使用线性或混合模型评估了气候对木材形成的影响。结果表明，与温带和寒带生态系统的完全休眠以及热带生态系统的完全活跃或短期休眠相比，1月份亚热带松树生态系统存在一个可能处于半休眠状态的不活跃期。 2015年中国亚热带红松木质部形成持续时间比温带和寒带森林长4-6个月。此外，发现树木在旱季比雨季生长得更好，这表明红松生态系统受净能量的调节比环境因素更强烈。我们的研究结果表明，中国的亚热带松林可能受益于预期的较长旱季，在气候持续变暖的情况下可能会导致更好的森林生长并改善碳固存。
China's subtropical forests play a vital role in sequestering global carbon; therefore, it is critical to conduct a precise investigation of intra-annual wood formation in these ecosystems to clarify the mechanisms behind this. Two field experiments were established in Chinese subtropical forests to monitor weekly the intra-annual xylem formation of Pinus massoniana Lamb. from January to December 2015, using the recently developed micro-sampling approach. The effects of climate on wood formation were also assessed using linear or mixed models. Results indicate that there is an inactive period that might be semi-dormancy in subtropical pine ecosystems in January compared with the complete dormancy in temperate and boreal ecosystems and the fully active or short-term dormancy in tropical ecosystems. The duration of xylem formation of Chinese red pine in subtropical China in 2015 was 4-6 months longer than temperate and boreal forests. Moreover, trees were found to grow better during the dry season than the wet season, indicating that the Chinese red pine ecosystem is more strongly regulated by net energy than by environmental factors. Our findings indicate that China's subtropical pine forests may benefit from the expected longer dry seasons, possibly leading to better forest growth and improved carbon sequestration under continued climate warming.