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Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems
Dou, XL; Cheng, XL; He, P; Zhu, P; Zhou, W; Wang, LG
刊名SOIL & TILLAGE RESEARCH
2017
卷号174页码:6-13
英文摘要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.
WOS记录号WOS:000412265800002
内容类型期刊论文
源URL[http://202.127.146.157/handle/2RYDP1HH/1279]  
专题中国科学院武汉植物园
推荐引用方式
GB/T 7714
Dou, XL,Cheng, XL,He, P,et al. Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems[J]. SOIL & TILLAGE RESEARCH,2017,174:6-13.
APA Dou, XL,Cheng, XL,He, P,Zhu, P,Zhou, W,&Wang, LG.(2017).Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems.SOIL & TILLAGE RESEARCH,174,6-13.
MLA Dou, XL,et al."Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems".SOIL & TILLAGE RESEARCH 174(2017):6-13.
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