Journal of Plant Ecology ›› 2026, Vol. 19 ›› Issue (1): 1-.DOI: 10.1093/jpe/rtaf138
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Huiqi Zhang1,2,3, Guangxuan Han2,3, Wenli Jia1,2,3, Wanxin Huang2,3,4, Xiaoshuai Zhang2,3, Xiaojie Wang2,3, Mingliang Zhao2,3, Baohua Xie2,3, Feng Lu5, Jianbin Song5, Wei Zhang6 and Xiaojing Chu2,3,*
1School of Geography and Environment, Liaocheng University, Liaocheng 252000, China, 2CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, China, 3Yellow River Delta Field Observation and Research Station of Coastal Marsh Ecosystem, Chinese Academy of Sciences, Dongying 257000, China, 4School of Ecology, Hainan University, Haikou 570228, China, 5Administration Bureau of the Yellow River Delta National Nature Reserve, Dongying 257091, China, 6School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
*Corresponding author. E-mail: xjchu@yic.ac.cn
摘要： 全球气候变化导致降水格局变化，致使盐沼湿地土壤汇不确定性上升。为探究季节性降水分配(SPD)对土壤碳排放的影响机制，本研究在黄河三角洲盐沼湿地开展了原位控制实验。基于历史降水数据(1961–2018年)，在维持年降雨量不变的前提下设置了5种SPD处理(+73%、+56%、CK、−56%和−73%)：其中，春季降水增加处理(+73%和+56%)对应夏秋季降水等比例减少，而春季降水减少处理(−56%和−73%)则伴随夏秋季降水等比例增加，所有处理冬季降水量保持一致。结果表明，SPD变化显著改变土壤CO2通量年际动态，并且+56%处理对土壤CO2排放的促进作用高于+73%处理。相比之下，SPD对土壤CH4通量无显著影响。结构方程模型显示，SPD驱动的CO2通量增加主要源于春季盐分胁迫解除和植被碳分配过程的协同作用。这主要与SPD通过调控水盐动态产生的双重效应有关：春季增雨缓解土壤盐渍化胁迫，显著促进植被定植；而夏秋季减雨则通过降低淹水压力提升植被生产力。上述结果为优化湿地碳循环模型中的降水参数提供了理论依据。
