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自养微生物同化碳在土壤腐殖质组分及团聚体中的分配

简 燕 曾冠军 周 萍 袁红朝 葛体达 邹冬生 吴金水

简 燕, 曾冠军, 周 萍, 袁红朝, 葛体达, 邹冬生, 吴金水. 自养微生物同化碳在土壤腐殖质组分及团聚体中的分配[J]. 环境科学研究, 2014, 27(12): 1499-1504.
引用本文: 简 燕, 曾冠军, 周 萍, 袁红朝, 葛体达, 邹冬生, 吴金水. 自养微生物同化碳在土壤腐殖质组分及团聚体中的分配[J]. 环境科学研究, 2014, 27(12): 1499-1504.
JIAN Yan, ZENG Guan-jun, ZHOU Ping, YUAN Hong-zhao, GE Ti-da, ZOU Dong-sheng, WU Jin-shui. Input and Distribution of Autotrophic Microbe-Assimilated Carbon in Humus and Aggregate Fractions of Soils[J]. Research of Environmental Sciences, 2014, 27(12): 1499-1504.
Citation: JIAN Yan, ZENG Guan-jun, ZHOU Ping, YUAN Hong-zhao, GE Ti-da, ZOU Dong-sheng, WU Jin-shui. Input and Distribution of Autotrophic Microbe-Assimilated Carbon in Humus and Aggregate Fractions of Soils[J]. Research of Environmental Sciences, 2014, 27(12): 1499-1504.

自养微生物同化碳在土壤腐殖质组分及团聚体中的分配

基金项目: 国家自然科学基金项目(41271279,41090283)

Input and Distribution of Autotrophic Microbe-Assimilated Carbon in Humus and Aggregate Fractions of Soils

  • 摘要: 采用14C-CO2(碳同位素)连续标记技术结合室内模拟培养试验,采用土壤有机质的物理、化学分组方法,研究了不同种植方式〔P-R(盘塘水稻土)、P-U(盘塘水旱轮作土)和U-C(盘塘坡旱土)〕下14C-SOC(自养微生物同化碳)在土壤腐殖质组分和团聚体中的分配特征. 结果表明:不同种植方式显著影响自养微生物的固碳能力,P-R的自养微生物固碳能力最强〔w(14C-SOC)为38.32 mg/kg〕,约为P-U和U-C的2倍;P-R和P-U中w(14C-DOC)、w(14C-MBC)显著大于U-C中. 14C-SOC不同程度地进入了土壤的3种腐殖质组分(胡敏素、胡敏酸、富啡酸)中,其中进入胡敏素中的14C-SOC占总量的67.7%. 14C-SOC亦进入了不同粒径的土壤团聚体中,其中主要进入了Ⅲ级(0.020 mm≤粒径<0.200 mm)和Ⅱ级(0.200 mm≤粒径<2.000 mm)粒径的大团聚体中,表现出了碳汇效应;不同种植方式的土壤中,以P-R土壤各粒径土壤团聚体中w(14C-SOC)最高. 相关分析表明,全土中的w(14C-SOC)与各粒径土壤团聚体中w(14C-SOC)和胡敏酸中w(14C-SOC)均呈显著正相关.

     

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出版历程
  • 收稿日期:  2014-03-20
  • 修回日期:  2014-05-28
  • 刊出日期:  2014-12-25

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