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| Inter-annual changes in the aggregate-size distribution and associated carbon of soil and their effects on the straw-derived carbon incorporation under long-term no-tillage |
YIN Tao1, 2, ZHAO Cai-xia3, YAN Chang-rong1, 2, DU Zhang-liu1, HE Wen-qing1, 2 |
1 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2 Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Minstry of Agriculture, Beijing 100081, P.R.China
3 College of Plant Protection, Agricultural University of Hebei, Baoding 071001, P.R.China |
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Abstract Converting from conventional tillage to no-tillage influences the soil aggregate-size distribution and thus soil organic carbon (SOC) stabilization. However, the dynamics of soil aggregation and the straw-derived carbon (C) incorporation within aggregate fractions are not well understood. An experiment was established in 2004 to test the effects of two treatments, no-tillage with residue (NT) and conventional tillage without residue (CT), on the soil aggregate-size distribution and SOC stabilization in a continuous maize (Zea mays L.) cropping system located in the semiarid region of northern China. Soil samples were collected from the 0–10 cm layer in 2008, 2010 and 2015, and were separated into four aggregate-size classes (>2, 0.25–2, 0.053–0.25, and <0.053 mm) by wet-sieving. In each year, NT soil had a higher proportion of macroaggregates (i.e., >2 and 0.25–2 mm) and associated SOC concentration compared with CT. Additionally, to compare straw-derived C incorporation within NT and CT aggregate fractions, 13C-labeled straw was incubated with intact NT and CT soils. After 90 days, the highest proportion of 13C-labeled straw-derived C was observed in the >2 mm fraction, and this proportion was lower in NT than that in CT soil. Overall, we conclude that long-term continuous NT increased the proportion of macroaggregates and the C concentration within macroaggregates, and the physical protection provided by NT is beneficial for soil C sequestration in the continuous maize cropping system in semiarid regions of northern China.
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Received: 14 September 2017
Accepted:
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| Fund: This study was partially supported by the National Natural Science Foundation of China (31171512) and the Central Public-interest Scientific Institution Basal Research Fund, China (Y2017PT26). |
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Corresponding Authors:
Correspondence HE Wen-qing, E-mail: hewenqing@caas.cn
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| About author: YIN Tao, E-mail: hclzfyt@hotmail.com; |
Cite this article:
YIN Tao, ZHAO Cai-xia, YAN Chang-rong, DU Zhang-liu, HE Wen-qing.
2018.
Inter-annual changes in the aggregate-size distribution and associated carbon of soil and their effects on the straw-derived carbon incorporation under long-term no-tillage. Journal of Integrative Agriculture, 17(11): 2546-2557.
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