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Testing for soil carbon saturation behavior in agricultural soils receiving long-term manure amendments

文献类型: 外文期刊

作者: Feng, W. 1 ; Xu, M. 2 ; Fan, M. 3 ; Malhi, S. S. 4 ; Schoenau, J. J. 5 ; Six, J. 6 ; Plante, A. F. 1 ;

作者机构: 1.Univ Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA

2.Chinese Acad Agr Sci, Minist Agr, Key Lab Crop Nutr & Fertilizat, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

3.China Agr Univ, Coll Resources & Environm Sci, Beijing 10094, Peoples R China

4.Agr & Agri Food Canada, Melfort, SK S0E 1A0, Canada

5.Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK S7N 5A8, Canada

6.ETH, CH-8092 Zurich, Switzerland

关键词: Fertilization;long-term;manure;silt plus clay;soil carbon saturation

期刊名称:CANADIAN JOURNAL OF SOIL SCIENCE ( 影响因子:1.522; 五年影响因子:1.805 )

ISSN: 0008-4271

年卷期: 2014 年 94 卷 3 期

页码:

收录情况: SCI

摘要: Agricultural soils are typically depleted in soil organic matter compared with their undisturbed counterparts, thus reducing their fertility. Organic amendments, particularly manures, provide the opportunity to restore soil organic matter stocks, improve soil fertility and potentially sequester atmospheric carbon (C). The application of the soil C saturation theory can help identify soils with large C storage potentials. The goal of this study was to test whether soil C saturation can be observed in various soil types in agricultural ecosystems receiving long-term manure amendments. Seven long-term agricultural field experiments from China and Canada were selected for this study. Manure amendments increased C concentrations in bulk soil, particulate organic matter+sand, and silt+clay fractions in all the experiments. The increase in C concentrations of silt+clay did not fit the asymptotic regression as a function of C inputs better than the linear regression, indicating that silt+clay did not exhibit C saturation behavior. However, 44% of calculated C loading values for silt+clay were greater than the presumed maximal C loading, suggesting that this maximum may be greater than 1 mg C m(-2) for many soils. The influences of soil mineral surface properties on C concentrations of silt+clay fractions were site specific. Fine soil particles did not exhibit C saturation behavior likely because current C inputs were insufficient to fill the large C saturation deficits of intensely cultivated soils, suggesting these soils may continue to act as sinks for atmospheric C.

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