降雨量和降雨时间共同调控黄河三角洲典型盐沼湿地土壤碳矿化

doi:10.13287/j.1001-9332.202102.033

应用生态学报 ›› 2021, Vol. 32 ›› Issue (2): 581-590.doi: 10.13287/j.1001-9332.202102.033

降雨量和降雨时间共同调控黄河三角洲典型盐沼湿地土壤碳矿化

李雪^1,2,3, 董杰¹, 李培广^2,3, 王晓杰^2,3, 韩广轩^2,3, 宋维民^2,3*

¹聊城大学环境与规划学院, 山东聊城 252059;
²中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 山东烟台 264003;
³中国科学院黄河三角洲滨海湿地生态实验站, 山东东营 257500

收稿日期:2020-06-02 接受日期:2020-10-28 出版日期:2021-02-15 发布日期:2021-08-15
通讯作者: ^*E-mail: wmsong@yic.ac.cn
作者简介:李雪, 女, 1996年生, 硕士研究生. 主要从事滨海湿地碳循环研究. E-mail: lixue19961007@163.com
基金资助:
国家自然科学基金项目(41706097)、国家自然科学基金委员会-山东联合基金项目(U1906220)和中国科学院“十三五”信息化建设专项(XXH13506)资助

Co-regulation of rainfall amount and timing on soil carbon mineralization in a typical salt marsh of the Yellow River Delta, China

LI Xue^1,2,3, DONG Jie¹, LI Pei-guang^2,3, WANG Xiao-jie^2,3, HAN Guang-xuan^2,3, SONG Wei-min^2,3*

¹College of Environment and Planning, Liaocheng University, Liaocheng 252059, Shandong, China;
²CAS Key Laboratory of Coastal Environmental Processes and Ecological Restoration, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (CAS), Yantai 264003, Shandong, China;
³Yellow River Delta Research Station of Coastal Wetland Ecology, Chinese Academy of Sciences, Dongying 257500, Shandong, China

Received:2020-06-02 Accepted:2020-10-28 Online:2021-02-15 Published:2021-08-15
Contact: ^*E-mail: wmsong@yic.ac.cn
Supported by:
National Natural Science Foundation of China (41706097), the NSFC-Shandong Union Project (U1906220), and the 13th Five-year Informatization Plan of Chinese Academy of Sciences (XXH13506)

摘要/Abstract

摘要： 研究降雨格局(如降雨量和降雨时间)对滨海盐沼湿地土壤碳矿化的影响,对于深入理解土壤碳的稳定性和积累机制具有重要意义。本研究选取远离海岸且不受潮汐影响的黄河三角洲原生盐地碱蓬盐沼湿地为对象,通过野外原状土柱的控制试验,分析土壤碳矿化(CO₂和CH₄通量)在不同时期(干旱期和湿润期)对降雨事件的响应。结果表明: 降雨时间和降雨量对土壤CO₂通量的影响存在交互作用。在干旱期,大降雨事件显著降低了土壤CO₂通量;而湿润期的降雨事件对土壤CO₂通量没有显著影响,这可能与盐沼湿地的水盐运移有关。降雨量、降雨时间及其交互作用均对土壤CH₄通量没有显著影响。降雨时间和降雨量对CH₄/CO₂比率均没有显著影响,但是相关分析表明随着土壤含水量和盐分的升高,CH₄/CO₂比率呈升高趋势。随着降雨量的增加,土壤含水量和土壤盐分都显著增加,且两因素呈现显著的正相关关系。因此,未来该地区降雨体系改变将可能通过调控土壤水盐运移等条件对该滨海湿地土壤碳矿化和碳汇功能产生深远影响。

关键词: 降雨体系, 气候变化, 黄河三角洲, 盐沼湿地, 碳汇, 土壤碳矿化

Abstract: Studying the effects of rainfall regimes such as rainfall amount and timing on soil carbon mineralization is of great importance for our understanding the mechanisms underlying the stability and accumulation of soil carbon in coastal salt marshes. In this study, we examined the responses of soil carbon mineralization (CO₂ and CH₄ fluxes) from undisturbed soil columns to rainfall events in different seasons (dry and wet seasons) with filed experiments in a primary Suaeda salsa region in the Yellow River Delta salt-marsh wetland, which is far away from the coast and not affected by tides. The results showed that rainfall amount and timing had a significant interaction in affecting soil CO₂ flux rates. During the dry season, large rainfall events significantly reduced soil CO₂ flux rates but had no significant effect in the wet season, which might be closely related to the significant increase in soil water content and salinity. Rainfall amount, rainfall timing and their interactions had no significant effect on soil CH₄ efflux rates. Rainfall timing and rainfall amount did not affect CH₄/CO₂. CH₄/CO₂ increased with increasing soil water content and salinity. Soil water content and soil salinity showed similar increases to increasing rainfall amount. Our results suggested that the changing rainfall regime under climate change in the future would have a great impact on soil carbon mineralization and carbon sink function by regulating soil water and salt migration in this region.

Key words: rainfall regime, climate change, the Yellow River Delta, salt marsh, carbon sink, soil carbon mineralization

李雪, 董杰, 李培广, 王晓杰, 韩广轩, 宋维民. 降雨量和降雨时间共同调控黄河三角洲典型盐沼湿地土壤碳矿化[J]. 应用生态学报, 2021, 32(2): 581-590.

LI Xue, DONG Jie, LI Pei-guang, WANG Xiao-jie, HAN Guang-xuan, SONG Wei-min. Co-regulation of rainfall amount and timing on soil carbon mineralization in a typical salt marsh of the Yellow River Delta, China[J]. Chinese Journal of Applied Ecology, 2021, 32(2): 581-590.

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降雨量和降雨时间共同调控黄河三角洲典型盐沼湿地土壤碳矿化

Co-regulation of rainfall amount and timing on soil carbon mineralization in a typical salt marsh of the Yellow River Delta, China

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