昼夜不对称增温对长白山阔叶红松林碳汇能力的影响
收稿日期: 2022-11-28
录用日期: 2023-06-27
网络出版日期: 2023-06-28
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基金资助
国家自然科学基金(32201329);国家自然科学基金(32201289);中国博士后科学基金(2021M703465)
Influence of diurnal asymmetric warming on carbon sink capacity in a broadleaf Korean pine forest in Changbai Mountains, China
Received date: 2022-11-28
Accepted date: 2023-06-27
Online published: 2023-06-28
Supported by
National Natural Science Foundation of China(32201329);National Natural Science Foundation of China(32201289);China Postdoctoral Science Foundation(2021M703465)
过去50年的气温数据表明全球陆地表面在夜间比白天变暖更快, 然而以往的研究大多关注全天对等增温的影响, 对昼夜不对称增温效应的认识不足。该研究利用光合增益和水力成本优化模型分析了两种增温情景(昼夜等幅升温和昼夜不等幅升温)对长白山阔叶红松林植被动态的影响。结果表明: 光合增益和水力成本优化模型可以很好地模拟长白山阔叶红树林的碳收支状态(R2 = 0.67, p < 0.001)。增温普遍促进了长白山阔叶红树林的碳汇(11.2%-13.8%), 但未显著改变其水分利用效率; 而不同增温情景对年固碳量的促进作用并无显著差异。与此同时, 增温增加了森林植被的水分压力, 从而增加了植物的导水率损失百分数(水力脆弱性, 1.1%)。由此可见, 相比于当前气候条件, 所有增温情景均会提高森林的碳汇能力, 但同时也会加大森林的死亡风险, 进而降低森林碳汇潜力。
李伟斌, 张红霞, 张玉书, 陈妮娜 . 昼夜不对称增温对长白山阔叶红松林碳汇能力的影响[J]. 植物生态学报, 2023 , 47(9) : 1225 -1233 . DOI: 10.17521/cjpe.2022.0478
Aims Meteorological data show faster warming of the global land surface during the night than during the day in the past 50 years. However, most of the previous studies were focused on the effects of whole-day equivalent warming, and the understanding of effects of diurnal asymmetric warming remains elusive.
Methods This study evaluated the effects of diurnal asymmetric warming on carbon sink capacity using a optimization model considering photosynthetic gain and hydraulic cost in a broadleaf Korean pine (Pinus koraiensis) forest in Changbai Mountains.
Important findings Results show that the model simulations matched well with observations of net primary production based on the data measured from eddy covariance flux towers. Warming promoted carbon sequestration (11.2%-13.8%) in our study area but did not significantly affect the water use efficiency, and the positive effects on annual carbon sequestration had no statistical difference among different warming scenarios. In addition, warming increased the water stress for forest plants, subsequently increasing the loss percentage of conductivity (PLC, hydraulic vulnerability; 1.1%). In conclusion, all warming scenarios significantly enhanced the current carbon sink capacity of forests compared with ambient condition, but warming may increase the risk of forest death through hydraulic failure, which would significantly affect the future forest carbon sink.
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