Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems | |
Cheng, Xiaoli; He, Ping; Zhu, Ping; Zhou, Wei; Wang, Ligang; Dou, Xiaolin | |
刊名 | SOIL & TILLAGE RESEARCH |
2017-12-01 | |
卷号 | 174期号:10页码:6-13 |
关键词 | Continuous Maize Cropping Maize-soybean Rotation Delta C-13 Soil Aggregates Density Fractionation Soil c Turnover |
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. |
内容类型 | 期刊论文 |
源URL | [http://ir.rcees.ac.cn/handle/311016/38991] |
专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
推荐引用方式 GB/T 7714 | Cheng, Xiaoli,He, Ping,Zhu, Ping,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(10):6-13. |
APA | Cheng, Xiaoli,He, Ping,Zhu, Ping,Zhou, Wei,Wang, Ligang,&Dou, Xiaolin.(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(10),6-13. |
MLA | Cheng, Xiaoli,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 174.10(2017):6-13. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论