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生态学杂志 ›› 2020, Vol. 39 ›› Issue (12): 4090-4097.doi: 10.13292/j.1000-4890.202012.012

• 研究报告 • 上一篇    下一篇

盐城滨海湿地不同植被类型土壤呼吸

程寅瑞1,2,3*,查勇1,2,3,陈丽娟1,2,3,韦耿1,2,3   

  1. 1南京师范大学地理科学学院, 南京 210023;2虚拟地理环境教育部重点实验室(南京师范大学), 南京 210023;3江苏省地理信息资源开发与利用协同创新中心, 南京 210023)
  • 出版日期:2020-12-10 发布日期:2021-06-10

Soil respiration in different vegetation types in Yancheng coastal wetland.

CHENG Yin-rui1,2,3*, ZHA Yong1,2,3, CHEN Li-juan1,2,3, WEI Geng1,2,3   

  1. (1School of Geography, Nanjing Normal University, Nanjing 210023, China; 2Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China; 3Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China).
  • Online:2020-12-10 Published:2021-06-10

摘要: 天然湿地在全球碳循环中起重要作用,研究滨海湿地碳循环过程对评估沿海地区碳收支有重要意义。为了探索江苏盐城滨海湿地碳循环过程,利用静态箱法测定了该地互花米草(Spartina alterniflora)、芦苇(Phragmites australis)、盐地碱蓬(Suaeda salsa)湿地土壤呼吸,采用去除根系法分离了土壤异养呼吸与自养呼吸。结果表明,各植被类型土壤呼吸均有明显月际变化,夏季较高,冬季较低。不同植被类型土壤呼吸差异显著,互花米草湿地年均土壤呼吸最高,盐地碱蓬湿地最低。互花米草、芦苇、盐地碱蓬湿地年均土壤呼吸依次为210.7、174.7、115.3 mg CO2·m-2·h-1。其中,异养呼吸的贡献率分别为38.8%、35.9%、52.0%,自养呼吸的贡献率分别为61.2%、64.1%、48.0%。不同植被类型间植物生物量、土壤可溶性有机碳(DOC)含量和微生物生物量碳(MBC)均存在显著差异。相关分析与多元逐步回归结果进一步显示,地下生物量、土壤DOC含量与MBC是引起不同植被类型土壤呼吸差异的重要原因。对湿地大气碳平衡的估算结果表明,互花米草、芦苇、盐地碱蓬湿地均为大气的碳汇,固碳能力分别为811.1、760.0、145.9 g C·m-2·a-1,互花米草湿地的固碳能力最强。

关键词: 滨海湿地, 互花米草, 土壤呼吸, 异养呼吸, 碳平衡

Abstract: Natural wetlands play an important role in global carbon cycle. Understanding the carbon cycling in coastal wetlands has great significance for estimating the carbon budget of coastal areas. To explore the carbon cycling of Yancheng coastal wetland in Jiangsu Province, we measured soil respiration in three types of wetlands respectively dominated by Spartina alterniflora, Phragmites australis, and Suaeda salsa using the static chamber technique. The root removal method was used to measure soil autotrophic and heterotrophic respiration. The results showed that soil respiration in the three wetland types exhibited significant seasonal variations, with higher values in summer and lower values in winter. Soil respiration varied significantly across vegetation types, with the highest value in the S. alterniflora wetland and the lowest value in the S. salsa wetland. The annual average soil respiration in the S. alterniflora, P. australis, and S. salsa wetlands were 210.7, 174.7, and 115.3 mg CO2·m-2·h-1, respectively. The contributions of heterotrophic respiration to CO2 emissions for the three vegetation types were 38.8%, 35.9%, and 52.0%, respectively. The contributions of autotrophic respiration were 61.2%, 64.1%, and 48.0%. There were significant differences in plant biomass, soil dissolved organic carbon (DOC) content, and microbial biomass carbon (MBC) among different vegetation types. The results of correlation analysis and stepwise regression showed that belowground biomass, soil DOC content and MBC were the main factors driving the variation of soil respiration across different vegetation types. The estimation of the wetlandatmosphere carbon balance showed that S. alterniflora, P. australis, and S. salsa wetlands were all sinks of atmospheric carbon, with carbon sequestration rates of 811.1, 760.0, and 145.9 g C·m-2·a-1, respectively. Among all the wetlands, the S. alterniflora wetland had the highest sequestration rate.

Key words: coastal wetland, Spartina alterniflora, soil respiration, heterotrophic respiration, carbon balance.

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