坡耕地黑土剖面有机碳的分布和δ13C值研究
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* 中国科学院国外杰出人才支持项目(K09Z3);国家自然科学基金项目(40271108和40471125)资助


PROFILE DISTRIBUTION OF ORGANIC CARBON AND δ13C IN A BLACK SOIL AT A SLOPING FIELD
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    摘要:

    以一东北黑土典型漫岗坡耕地为研究对象,通过测定不同地形部位(坡顶、坡肩、坡背、坡脚和坡足)部分土壤属性和δ13C值,探索土壤侵蚀和沉积对土壤有机碳(SOC)动态的影响。结果表明:表层土壤δ13C值与地形坡度、土壤粘粒含量、土壤含水量、pH值都显著相关。δ13C在土壤剖面中随深度变化,能够反映作物残体输入和土壤累积特征,有助于鉴定原始埋藏土壤表层。侵蚀部位土壤δ13C值与SOC含量线性拟合的倾斜角β与地形坡度成正相关,与粘粒含量成负相关,是反映SOC周转的一个良好指标。坡肩和坡背C3-C显著低于坡顶(对照点),C4-C含量无显著性差异,说明不同侵蚀程度的地形部位SOC含量差异主要是由C3-C引起;坡脚和坡足C4-C显著低于坡肩和坡背,说明沉积区新碳损失更大。

    Abstract:

    A tract of farmland on a typical mount in Northeast China was selected as a case to study effect of soil erosion and deposition on dynamics of soil organic carbon (SOC) by determining some properties and δ13C of the soils at different topographic positions.The results showed that the δ13C value of the surface soil was significantly correlated to slope gradient, clay content, soil moisture and pH.The change in δ13C with depth in soil profile reflected input of plant residue and accumulation of eroded soil, which helps to identify buried soil surfaces.The slope (β) of linear regression between isotopic composition and SOC concentration was positively related to slope gradient of the landscape and negatively related to clay content, indicating that β could be used as a useful index to describe mineralization of SOC at the erosion position.The contents of C3-C at the shoulder and back of the slope were significantly less than that at the summit and C4-C showed no obvious difference between them, indicating the differences in SOC content between erosion sites resulted from C3-C.The contents of C4-C at the foot and toe of the slope were significantly less than those at the shoulder and back of the slope, which indicates that the loss of new carbon at deposited sites was greater.

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方华军,杨学明,张晓平,梁爱珍.坡耕地黑土剖面有机碳的分布和δ13C值研究[J].土壤学报,2005,42(6):957-964. DOI:10.11766/trxb200409030612 Fang Huajun, Yang Xueming, Zhang Xiaoping, Liang Aizhen. PROFILE DISTRIBUTION OF ORGANIC CARBON AND δ13C IN A BLACK SOIL AT A SLOPING FIELD[J]. Acta Pedologica Sinica,2005,42(6):957-964.

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  • 收稿日期:2004-09-03
  • 最后修改日期:2005-03-16
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  • 在线发布日期: 2013-02-25
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