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 Tao; ZHAO Cai-xia; YAN Chang-rong; DU Zhang-liu; HE Wen-qing

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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

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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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《农业科学学报（英文版）》 |2018年第11期|2546-2557|共12页
作者
YIN Tao; ZHAO Cai-xia; YAN Chang-rong; DU Zhang-liu; HE Wen-qing;
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作者单位

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081,P.R.China;

Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Minstry of Agriculture, Beijing 100081,P.R.China;

College of Plant Protection, Agricultural University of Hebei, Baoding 071001, P.R.China;

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081,P.R.China;

Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Minstry of Agriculture, Beijing 100081,P.R.China;

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081,P.R.China;

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081,P.R.China;

Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Minstry of Agriculture, Beijing 100081,P.R.China;

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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

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