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Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems

文献类型： 外文期刊

作者： Dou, Xiaolin 1 ; Cheng, Xiaoli 3 ; He, Ping 2 ; Zhu, Ping 4 ; Zhou, Wei 2 ; Wang, Ligang 2 ;

作者机构： 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

3.Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Hubei, Peoples R China

4.Jilin Acad Agr Sci, Gongzhuling 130124, Peoples R China

关键词： Continuous maize cropping;Maize-soybean rotation;delta C-13;Soil aggregates;Density fractionation;Soil C turnover

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

ISSN： 0167-1987

年卷期： 2017 年 174 卷

页码：

收录情况： SCI

摘要： Quantification of the dynamics of soil organic carbon (SOC) pools under the influence of different cropping systems is essential for predicting carbon (C) sequestration. We combined soil fractionation with C isotope analyses to investigate the SOC dynamics of the various soil fractions in a black soil of Northeast China after 25 years of tillage. Soil samples from the initial condition (CK) and 2 cropping treatments including continuous maize cropping (MM), maize-soybean rotation (MS) were separated into 4 aggregate sizes (< 53 mu m, 250-53 mu m, 2000-250 mu m, and > 2000 pm) and 3 density fractions: free light fraction (LF), intra-aggregate particulate organic matter (iPOM), and mineral-associated organic matter (mSOM). The 25 years of cropping with manure application significantly increased the SOC storage, mainly by enhancing the soil C of the macroaggregates (2000-250 pm), with most of the C stored in the iPOM (62.01-90.32%). The MS system was more beneficial for the SOC accumulation in macroaggregates (> 250 pm) than the MM system because of enhanced SOC in heavier fractions (iPOM and mSOM); this was probably induced by the differentiation of the below ground humification rate between soybean and maize roots, while the MM system may be a more effective measure for future soil C sequestration because most of the stable C is stored in the small size fraction (< 53 mu m). The delta C-13 values indicated that, among aggregate sizes, the fastest soil C turnover occurred in microaggregates (250-53 mu m). Moreover, C in the MS soils had a faster turnover rate than in the MM soils.

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[1]Effects of long-term fertilization and cropping regimes on total nitrogen and organic nitrogen forms in a Mollisol of Northeast China. Li, H.,Gao, Q.,Gao, H. J.,Zhu, P.,Wang, L. C..

[2]Effects of Integrated Soil-Crop System Management on Soil Organic Carbon Characteristics in a Primosol in Northeast China. Zhang Jinjing,Cao Zhiyuan,Feng Guozhong,Li Mengyao,Li Cuilan,Gao Qiang,Wang Lichun. 2017

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