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中国科学院大学学报 ›› 2004, Vol. 21 ›› Issue (4): 538-542.DOI: 10.7523/j.issn.2095-6134.2004.4.017

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小叶章湿地土壤可利用性碳对微生物呼吸的限制作用——三江平原为例(英文)

徐小锋1, 宋长春1, 宋霞2   

  1. 1. 中国科学院东北地理与农业生态研究所, 长春 130012;
    2. 中国科学院地理科学与资源研究所, 北京 101001
  • 收稿日期:2003-06-30 修回日期:2004-05-15 发布日期:2004-07-10
  • 通讯作者: 徐小锋,Email:xuxiaofeng055@yahoo.com.Cn
  • 基金资助:

    theKnowledgeInnovationProgramoftheChineseAcademyofSciences(KZCX1SW01,KZCX1SW19,KZCX3SW332)

Limitation of Available Carbon on MicrobialRespiration in the Calamagrostis angustifolia Soil-A Case Study in Sanjiang Plain*

XU Xiao-Feng1, SONG Chang-Chun1, SONG Xia2   

  1. 1. Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China;
    2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2003-06-30 Revised:2004-05-15 Published:2004-07-10

摘要:

研究了三江平原小叶章湿地土壤中碳的可利用性对土壤中微生物呼吸的限制作用.结果表明,表土和根层土中的可利用性碳显著限制微生物呼吸作用.在所有的培养土壤中,起始时微生物呼吸速率较高,随之急剧下降,这可能是由于土壤物理化学及生物性质的变化所致.土壤中有机质低于 1 0 %时,可以明显影响碳的可利用指数 ;大于 1 0 %以后就几乎没有影响了.微生物生物量碳与碳的可利用指数也存在较为显著的正相关关系.

关键词: 微生物呼吸, 微生物生物量碳, 土壤有机质, 小叶章, 三江平原

Abstract:

The limitation of carbon availability on microbial respirat ion was studied in the Calamagrostisangustifolia soil in Sanjiang Plain. The results suggest that carbon availability limits the microbialrespirat ion in root layer soil and subsoil initially, whereas it does not limit the microbial respiration after115 h incubation for recovery from the disturbance in physical, chemical and biological structure causedby sampling from the field, then after 5 h incubation when the labile carbon has been mineralized theavailable carbon limits the microbial respiration again. At the same time the results show that the soilorganic matter affects carbon availability index significantly when its value is lower than 10%, but theeffect is little when the soil organic matter is higher than 10%. The microbial biomass carbon is linearlycorrelated with carbon availability in the Calamagrostis angustifolia soil.

Key words: microbial respirat ion, microbial biomass carbon, soil organic matter, Calamagrostisangustifolia, Sanjiang Plain

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