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应用生态学报 ›› 2018, Vol. 29 ›› Issue (8): 2559-2565.doi: 10.13287/j.1001-9332.201808.008

• 研究报告 • 上一篇    下一篇

大气CO2浓度升高对不同层次水稻土有机碳稳定性的影响

陈栋1, 郁红艳1*, 邹路易1, 滕跃1, 朱春梧2   

  1. 1江南大学环境与土木工程学院/江苏省厌氧生物技术重点实验室, 江苏无锡 214122;
    2中国科学院南京土壤研究所, 南京 210008
  • 收稿日期:2017-12-06 出版日期:2018-08-20 发布日期:2018-08-20
  • 通讯作者: E-mail: hyyu@jiangnan.edu.cn
  • 作者简介:陈 栋,男,1992年生,硕士研究生. 主要从事稻田土壤碳循环研究. E-mail: 1280494670@qq.com
  • 基金资助:

    本文由江南大学自主科研计划青年基金项目(JUSRP11525)、国家自然科学基金项目(21307043)和中国博士后基金项目(2016M590411)资助

Effects of elevated atmospheric CO2 concentration on the stability of soil organic carbon in different layers of a paddy soil.

CHEN Dong1, YU Hong-yan1*, ZOU Lu-yi1, TENG Yue1, ZHU Chun-wu2   

  1. 1Jiangsu Key Laboratory of Anaerobic Biotechnology/School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;
    2Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
  • Received:2017-12-06 Online:2018-08-20 Published:2018-08-20
  • Supported by:

    This work was supported by the Independent Research Project of Jiangnan University (JUSRP11525), National Natural Science Foundation of China (21307043), and China Postdoctoral Science Foundation (2016M590411).

摘要: 研究大气CO2浓度升高对不同层次土壤有机碳(SOC)稳定性的影响对深入理解高浓度CO2下SOC转化具有重要意义.以FACE(Free Air Carbon-dioxide Enrichment)平台长期定位试验水稻土为研究对象,通过SOC物理分级及矿化培养试验,研究大气CO2浓度升高对稻田SOC含量、颗粒有机质(POM)含量、SOC矿化强度和酶活性变化的影响,探讨CO2浓度升高对不同层次稻田SOC稳定性的影响.结果表明:大气CO2浓度升高对表层SOC含量无显著影响,但使表层土壤POM-C显著增加了93.7%,同时使表层土壤蔗糖酶和多酚氧化酶活性分别提高了61.1%和83.7%,从而降低了表层SOC稳定性;大气CO2浓度升高对深层SOC含量及其稳定性均无显著影响.研究结果将有助于评估土壤固定和储备碳的能力,为今后温室效应下农田管理提供科学依据.

Abstract: It is vital to study the effects of elevated atmospheric CO2 concentration on the soil orga-nic carbon (SOC) stability in different soil layers for better understanding the mechanism of SOC transformation under the elevated atmospheric CO2 concentration. The paddy soil in a long-term FACE (Free Air Carbon-dioxide Enrichment) experiment was selected as the research object. Through the SOC physical fractionation and soil mineralization incubation, the effects of elevated atmospheric CO2 concentration on the soil organic carbon (SOC) content, particle organic matter (POM) content, SOC mineralization intensity, and enzyme activities were measured. Then, the effects of elevated atmospheric CO2 concentration on the SOC stability in different layers were exa-mined. The results showed that the elevated atmospheric CO2 concentration had no significant effect on SOC content, but significantly increased the POM-C content by 93.7% and the invertase and polyphenol oxidase activities by 61.1% and 83.7% in the topsoil layer, respectively. These results indicated that SOC stability of topsoil was reduced under the elevated atmospheric CO2 concentration. However, the elevated atmospheric CO2 concentration had no significant effect on the SOC stability of deep soil layer. Our results would help assess the capacity of soil sequestrated and accumulated organic carbon and provide basis for scientific management of farmland under greenhouse effect in the future.