Effects of substitution of chemical fertilizer by Chinese milk vetch on distribution and composition of aggregates-associated organic carbon fractions in paddy soils
文献类型： 外文期刊
作者： Huang, Yanan 1 ; Huang, Li 1 ; Nie, Jun 2 ; Geng, Mingjian 1 ; Lu, Yanhong 2 ; Liao, Yulin 2 ; Xue, Bin 4 ;
作者机构： 1.Huazhong Agr Univ, Key Lab Arable Land Conservat Middle & Lower Reac, Minist Agr & Rural Affairs, Wuhan 430070, Peoples R China
2.Hunan Acad Agr Sci, Soil & Fertilizer Inst Hunan Prov, Changsha 410125, Peoples R China
3.Minist Agr & Rural Affairs, Sci Observing & Expt Stn Arable Land Conservat Hu, Changsha 410125, Peoples R China
4.Ningxia Univ, Sch Ecol & Environm, Yinchuan 750021, Ningxia, Peoples R China
关键词： Chinese milk vetch; Mineral associated organic carbon; Organic carbon; Organic carbon fraction; Soil aggregate
期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）
ISSN： 0032-079X
年卷期：
页码：
收录情况： SCI
摘要： Purpose Green manure plays a key role in reducing chemical fertilizer applications and increasing soil organic carbon (SOC) stock. The effects of chemical fertilizer substitution by Chinese milk vetch (MV) on the distribution and composition of organic carbon fractions in macroaggregates and microaggregates and SOC stability mechanism were investigated in paddy soils in southern China. Methods A 10-year (2008-2018) field experiment was conducted, including no fertilizer (CK), 100% NPK fertilizer (F100), MV with different percentages of chemical fertilizer (MV + F100, MV + F80, MV + F60 and MV + F40). The soil was separated into distinct organic carbon fractions using aggregate density fractionation and SOC chemical structure was analyzed by fourier-transform infrared and nuclear magnetic resonance. Results Chemical fertilizer substitution by MV increased SOC contents in the bulk soil by 9.1% (MV + F80), 5.8% (MV + F60), 17.9% (MV + F40) compared to F100. Organic carbon fraction mainly existed in mineral associated organic carbon (mSOC), accounting for 70.3-83.7% and 69.4-84.0% of the relative mass of macroaggregates and microaggregates, respectively. Compared to F100, aromatic C increased by 11.6% and 29.1% under MV + F60 within mSOC in macroaggregates and microaggregates. Within the mSOC in macroaggregates, compared to CK, MV + F80 and MV + F60 promoted the proportion of alkyl C by 9.6% and 6.7%, and decreased the content of O-alkyl C by 14.1% and 11.0%, respectively, which correspondingly increased alkyl C/O-alkyl C ratio. Conclusions Substitution of chemical fertilizer by MV (especially MV + F80 and MV + F60) improved the stability of SOC via increasing recalcitrant structure in mSOC, and was conducive to the sequestration of SOC in paddy soils.
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