典型农耕区褐土水稳性团聚体有机碳的分布及组成  

Distribution and Composition of Organic Carbon in Water Stable Aggregates in Typical Arable Cinnamon Soil

作　　者：任雅阁[1,2] 马玲玲[2] 成杭新[3] 徐殿斗[2] 刘飞[3] 刘应汉[3] 刘志明[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]中国科学院高能物理研究所核技术应用研究中心核分析技术重点实验室,北京100049 [3]中国地质科学院地球物理与地球化学勘查研究所地球表层碳-汞地球化学循环重点实验室,河北廊坊065000

出　　处：《水土保持通报》2014年第2期15-19,共5页Bulletin of Soil and Water Conservation

基　　金：国土资源部专项"中国主要农耕区碳汇潜力研究"(200911020);"中国地质碳汇潜力研究"(1212011087123);国家自然科学基金项目(11375212)

摘　　要：对河北省典型农耕区褐土水稳性团聚体有机碳的组成特征进行了解析。结果表明,研究区水稳性土壤团聚体随粒径的减小而呈现＂两头低中间高＂的不规则W形分布趋势。藁城市和行唐县两地全土有机碳含量基本相当,分别为12.49和11.20g/kg。土壤有机碳主要受团聚体粒径分布的制约,藁城市和行唐县农耕区褐土优势团聚体（1000-250μm和250-53μm）中有机碳的比例分别为69.53%和82.71%。藁城市和行唐县〈20μm的团聚体有机碳含量分别为12.78和20.02g/kg,可作为研究区褐土固碳的稳定性指标。红外光谱解析表明,研究区土壤团聚体有机碳以芳香碳（大团聚体57.35%;微团聚体67.69%）和多糖碳（大团聚体29.43%;微团聚体：25.2%）为主。气候条件的差异可能是导致藁城市和行唐县土壤有机碳官能团组成差异的主要原因。大团聚体有机碳中主要是脂肪碳、多糖碳等活性较高的碳,而稳定的芳香碳则趋向于被保护在微团聚体中。This paper was aimed at the distribution and composition of organic carbons in water stable aggregates in typical arable cinnamon soil in Heibei Province.The size distribution of water stable aggregates was as irregular ＂W＂ shape with two lower ＂shoulders＂.Soil organic carbon content in Gaocheng City（12.49 g/kg）was roughly equivalent to that of Xingtang County（11.20g/kg）.The distribution of soil organic carbon（SOC）in soil was predominately constrained by the allocation of aggregates.Organic carbon in preponderant aggregates（1 000-250μm and 250-53μm）accounted for 69.53% and 82.71%in Gaocheng and Xingtang area,respectively.Organic carbon content in20μm aggregates was 12.78in Gaocheng City and 20.02g/kg and in Xingtang County,respectively,which can be considered as a stability index for cinnamon soil carbon sequestration in studied area.Fourier transform infrared spectroscopy showed that aromatic carbon（macroaggregates：57.35%;microaggregates：67.69%）and carbohydrate carbon（macroaggregates： 29.43%;microaggregates：25.2%）were the major organic carbon in studied area.Organic carbon in macroaggregates was mainly composed of labile carbon such as aliphatic carbon and carbohydrate carbon,et al.The stable aromatic carbon tend to be protected in microaggregates（Gaocheng City：57.89%;Xingtang County：77.51%）.

关 键 词：土壤 水稳性团聚体 有机碳 傅立叶变换红外光谱(FTIR) 

分 类 号：S152.4[农业科学—土壤学]