黄渤海湿地芦苇光合特征对增温的响应  

Responses of photosynthetic characteristics of Phragmites australis to simulated warming in salt marshes of the Yellow Sea and Bohai Sea,China

作　　者：袁书禹 谢柳娟 叶思源 周攀[2] 裴理鑫 丁喜桂 袁红明[2,3] 高宗军 YUAN Shuyu;XIE Liujuan;YE Siyuan;ZHOU Pan;PEI Lixin;DING Xigui;YUAN Hongming;GAO Zongjun(College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;China Geological Survey Key Laboratory of Coastal Wetland Biogeosciences,Qingdao Institute of Marine Geology,Qingdao 266071,Shandong,China;Laboratory for Marine Geology,Laoshan Laboratory,Qingdao 266237,Shandong,China)

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590 [2]青岛海洋地质研究所,中国地质调查局滨海湿地生物地质重点实验室,山东青岛266071 [3]崂山实验室,海洋地质过程与环境功能实验室,山东青岛266237

出　　处：《应用生态学报》2023年第7期1825-1833,共9页Chinese Journal of Applied Ecology

基　　金：崂山实验室科技创新项目(LSKJ202204003);国家重点研究发展计划中美政府间科技创新重点专项(2016YFE0109600);中国地质调查局项目(DD20221775,DD20189503);国土资源部公益性行业基金项目(201111023)资助。

摘　　要：滨海湿地是高效的蓝碳碳汇系统,但气候变暖正在直接或间接地影响着滨海湿地植物的光合作用特征,从而影响湿地的碳汇功能。本研究在少雨的黄河三角洲(东营)和多雨的江苏盐城两地芦苇湿地建设增温观测站,采用Li⁃6800光合测量系统研究在东营和盐城两地芦苇的光合特征对模拟增温的响应机制,并对比了东营6月与8月两个生长季的差异。结果表明:与8月相比,6月芦苇光合作用能力更强,增温在2个生长季均提高了芦苇的净光合速率(P_(n))、蒸腾速率(T_(r))、气孔导度(g_(s))和胞间CO_(2)浓度(C_(i)),但在8月Pn的正响应波动较小;与东营相比,盐城湿地的芦苇具有更高的Pn和水分利用率(WUE),且盐城湿地芦苇的最大净光合速率(P_(n max))、光饱和点(LSP)、表观量子效率(AQY)和暗呼吸速率(R_(d))对增温的正响应更为显著,其AQY、LSP和P_(n max)在增温样地分别提高了16.7%、53.6%和30.3%,表明在多雨湿润的条件下,增温可以提高植物的弱光利用效率、对强光的适应能力和光合作用潜力。本研究对于在气候变暖背景下准确量化滨海湿地在区域、季节尺度上的碳汇过程具有重要的参考价值。Coastal wetlands are highly efficient in blue carbon sequestration.The impacts of climate warming on photosynthetic rates and light response characteristics of wetland plants would change the magnitude of carbon sequestration in coastal wetlands.We constructed warming observation stations in Phragmites australis(Phragmites)wetlands located in the Yellow River Delta in Dongying with dry climate,and in Yancheng by the Yellow Sea with wet climate.By using a Li⁃6800 photosynthesis system,we investigated the responses of simulated warming on photosynthetic characteristics of Phragmites in both wetlands,and compared the difference between months(June and August)in Dongying wetland.The results showed the photosynthetic rates of Phragmites were higher in June than in August.Warming increased net photosynthetic rate(P_(n)),transpiration rate(T_(r)),stomatal conductance(g_(s))and intercellular carbon dioxide concentration(C_(i))in the two months,but the variability of P_(n)to warming was lower in August.The P_(n)and water use efficiency(WUE)of Phragmites in the Yancheng wetland were higher than Dongying wetland,and the maximum net photosynthetic rate(P_(n max)),light saturation point(LSP),apparent quantum efficiency(AQY),and dark respiration rate(R_(d))of the former responded more positively to warming.The values of AQY,LSP and P_(n max)of Phragmites in the Yancheng wetlands were increased by 16.7%,53.6%and 30.3%,respectively,in the warming plots.Our results suggested that warming could improve the utilization efficiency of weak light,the adaptability to strong light and photosynthetic potential of Phragmites under rainy and humid conditions.This study is of importance for accurately quantifying carbon sequestration of coastal wetlands at the regional and seasonal scales in the context of climate warming.

关 键 词：碳汇 光响应曲线 瞬时气体交换参数 被动增温 季节变化 

分 类 号：Q945.11[生物学—植物学]