Response of soil organic carbon fractions to increasing rates of crop residue return in a wheat-maize cropping system in north-central China
文献类型： 外文期刊
第一作者： Zhao, S. C.
作者： Zhao, S. C.;Huang, S. W.;Qiu, S. J.;He, P.
作者机构：
关键词： crop residues; residue incorporation; soil carbon sequestration; soil labile organic carbon; soil quality
期刊名称：SOIL RESEARCH （ 影响因子：1.987； 五年影响因子：2.47 ）
ISSN： 1838-675X
年卷期： 2018 年 56 卷 8 期
页码：
收录情况： SCI
摘要： Labile organic carbon (C) in soil can act as a sensitive indicator of its quality, and understanding its response to crop residue incorporation rates is critical to increase soil C storage by residue return in conjunction with chemical fertilisation. A 30-year field experiment was carried out to study the effects of various rates of maize residue return on soil organic C fractions in the presence of chemical fertilisers in a wheat-maize cropping system in north-central China. Studies included a no-fertiliser and no-residues control (CK) and maize residue return at rates of 0 (S0), 2250 (S1), 4500 (S2), and 9000 kg ha(-1) (S3) using chemical fertilisers. Soil total organic C (TOC) and labile organic C fractions were determined. The S0 treatment increased soil microbial biomass C (MBC), KMnO4-oxidisable C (KMnO4-C), and TOC, but did not change water-soluble organic C (WSOC), light fraction organic C (LFOC), and particulate organic C (POC), relative to CK. All organic C fractions did not differ between S0 and S1; however, S2-S3 increased MBC, WSOC, LFOC, POC, KMnO4-C, and TOC by 31.8-41.0%, 17.7-28.6%, 33.9-81.3%, 35.3-82.4%, 19.3-42.8%, and 9.7-20.4% compared with S0 respectively. The KMnO4-C had the highest correlation with TOC, with LFOC and POC showing higher sensitivity to different residue-return rates. Redundancy analysis showed that LFOC, POC, and KMnO4-C were mainly affected by residue-C and root-C, while MBC was closely correlated with rhizodeposition-C levels. Overall, low rates of residue return did not affect soil labile organic C and TOC, with they only started to increase significantly when annual residue return exceeded 4500 kg ha(-1) under chemical fertilisation; and the rate of increase for labile organic C was found to be higher than for non-labile C as residue inputs were increased.
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