昼夜不对称增温对长白山阔叶红松林碳汇能力的影响  

Influence of diurnal asymmetric warming on carbon sink capacity in a broadleaf Korean pine forest in Changbai Mountains,China

作　　者：李伟斌 张红霞 张玉书[1] 陈妮娜[1] LI Wei-Bin;ZHANG Hong-Xia;ZHANG Yu-Shu;CHEN Ni-Na(Institute of Atmospheric Environment,China Meteorological Administration,Key Laboratory of Agrometeorological Disasters of Liaoning Province,Shenyang 110166,China;State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,Ministry of Agriculture and Rural Affairs Key Laboratory of Grassland Livestock Industry Innovation,Ministry of Education Engineering Research Center of Grassland Industry,College of Pastoral Agriculture Science and Tecnology,Lanzhou University,Lanzhou 730020China;Shapotou Deser Research and Experiment Station,Northwest Institute ofEco-Environment and Resouroes,Chinese Academy of Sciences,Lanzhou 730000 China)

机构地区：[1]中国气象局沈阳大气环境研究所,辽宁省农业气象灾害重点实验室,沈阳110166 [2]草种创新与草地农业生态系统全国重点实验室,兰州大学农业农村部草牧业创新重点实验室,兰州大学草地农业教育部工程研究中心,兰州大学草地农业科技学院,兰州730020 [3]中国科学院西北生态环境资源研究院沙坡头沙漠研究试验站,兰州730000

出　　处：《植物生态学报》2023年第9期1225-1233,共9页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(32201329和32201289);中国博士后科学基金(2021M703465)。

摘　　要：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(R^(2)=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。Aims MIeteorological 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 findingss 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.

关 键 词：不对称增温 光合作用 栓塞脆弱性 水分利用效率 Sperry模型 

分 类 号：Q948[生物学—植物学]