气候变化下维管植物对大气碳同化和泥炭碳分解的调控作用  

Vascular Plant-mediated Controls on Atmospheric Carbon Assimilation and Peat Carbon Decomposition under Climate Change

作　　者：Konstantin Gavazov Remy Albrecht Alexandre Buttler Ellen Dorrepaal Mark H.Garnett Sebastien Gogo Frank Hagedorn Robert T.E.Mills Bjorn J.M.Robroek Luca Bragazza 鲁蕴哲(译) 徐汇遥(译) 胡雅琴(译) 谭薇(译) 赵红艳(译) Konstantin Gavazov;Remy Albrecht;Alexandre Buttler;Ellen Dorrepaal;Mark H.Garnett;Sebastien Gogo;Frank Hagedorn;Robert T.E.Mills;Bjorn J.M.Robroek;Luca Bragazza;Lu Yunzhe;Xu Huiyao;Hu Yaqin;Tan Wei;Zhao Hongyan(Swiss Federal Institute for Forest,Snow and Landscape Research,WSL Site Lausanne,Lausanne,Switzerland,CH-8903;Laboratory of Ecological Systems ECOS,School of Architecture,Civil and Environmental Engineering ENAC,Ecole Polytechnique Federale de Lausanne EPFL,Lausanne,Switzerland,CH-1015;Department of Ecology and Environmental Science,Climate Impacts Research Centre,Umea University,Abisko,Sweden,90184;Laboratoire de Chrono-Environnement,UMR CNRS 6249,UFR des Sciences et Techniques,Universite de Franche-Comté,Besanccon,France,25000;NERC Radiocarbon Facility(East Kilbride),EastKilbride,UK,G741AA;ISTO,UMR 7327,Universited'Orleans,Orleans,France,45067;ISTO,UMR 7327,CNRS,Orleans,France,75794;ISTO,UMR 7327,BRGM,Orleans,France,45071;Swiss Federal Institute for Forest,Snow and Landscape Research,WSL Site Birmensdorf,Birmensdorf,Switzerland,CH-8903;Lancaster Environment Centre,Lancaster University,Lancaster,UK,LA14Y W;Biological Sciences,University of Southampton,Southampton,UK,SO171BJ;Department of Life Science and Biotechnologies,University of Ferrara,Ferrara,Italy,35-44121;School of Geographical Sciences,Northeast Normal University,Changchun,130024)

机构地区：[1]瑞士联邦森林、雪与景观研究所洛桑基地,洛桑CH-8903 [2]瑞士洛桑联邦理工学院建筑、土木与环境工程学院生态系统实验室,洛桑CH-1015 [3]瑞典于默奥大学气候影响研究中心生态与环境科学系,阿比斯库90184 [4]法国弗朗升-孔泰大学科学与技术学院6249“Chrono-Environnement”实验室,贝桑松25000 [5]英国自然环境研究理事会放射性碳中心(东基尔布赖德),东基尔布赖德G741AA [6]法国奥尔良大学地球科学研究所,奥尔良45067 [7]法国国家科学研究中心奥尔良地球科学研究所,奥尔良75794 [8]法国地质矿产调查总局奥尔良地球科学研究所,奥尔良45071 [9]瑞士联邦森林、雪与景观研究所比尔门斯多夫基地,比尔门斯多夫CH-8903 [10]英国兰卡斯特大学兰卡斯特环境中心,兰卡斯特LA14YW [11]英国南安普顿大学生物科学学院,南安普顿SO171BJ [12]意大利费拉拉大学生命科学与生物技术系,费拉拉35-44121 [13]东北师范大学地理科学学院,长春130024

出　　处：《腐植酸》2023年第1期61-70,共10页Humic Acid

摘　　要：气候变化可以通过促进维管植物的生长来改变泥炭地植物群落的组成。然而,这种植被变化如何影响泥炭地碳动态仍然不清楚。为了评估植被变化对碳吸收和释放的影响,我们在两处以泥炭藓为主的泥炭地上进行了维管植物去除实验,这两处泥炭地代表了沿气候梯度下自然植被演替的不同阶段。对净生态系统CO_(2)交换量的周期性测量表明,维管植物在确保净碳吸收潜力方面发挥着关键作用,尤其是在气候变暖的情况下。然而,维管植物的存在也增强了生态系统呼吸量,通过利用呼吸作用产生的CO_(2)中放射性碳(bomb-^(14)C)特征的季节变化,我们证明根际激发效应增强了泥炭碳的异养分解。观察到的泥炭碳分解的根际激发效应与溶解有机物的更高度腐殖化相匹配,在植物的生长季之后仍然很明显。我们的研究结果强调了根际激发效应在泥炭地中的相关性,特别是在评估与气候变化相关的植被群落组成发生变化的泥炭地未来碳汇功能时。Climate change can alter peatland plant community composition by promoting the growth of vascular plants.How such vegetation change affects peatland carbon dynamics remains,however,unclear.In order to assess the effect of vegetation change on carbon uptake and release,we performed a vascular plant-removal experiment in two Sphagnum-dominated peatlands that represent contrasting stages of natural vegetation succession along a climatic gradient.Periodic measurements of net ecosystem CO_(2)exchange revealed that vascular plants play a crucial role in assuring the potential for net carbon uptake,particularly with a warmer climate.The presence of vascular plants,however,also increased ecosystem respiration,and by using the seasonal variation of respired CO_(2)radiocarbon(bomb-^(14)C)signature we demonstrate an enhanced heterotrophic decomposition of peat carbon due to rhizosphere priming.The observed rhizosphere priming of peat carbon decomposition was matched by more advanced humification of dissolved organic matter,which remained apparent beyond the plant growing season.Our results underline the relevance of rhizosphere priming in peatlands,especially when assessing the future carbon sink function of peatlands undergoing a shift in vegetation community composition in association with climate change.

关 键 词：气候变暖 分解 生态系统呼吸 海拔梯度 净生态系统CO_(2)交换 泥炭地 根际激发效应 维管植物生物量 

分 类 号：S141.6[农业科学—肥料学]