DOI: 10.1111/gcb.13289
论文题名: Deep ploughing increases agricultural soil organic matter stocks
作者: Alcántara V. ; Don A. ; Well R. ; Nieder R.
刊名: Global Change Biology
出版年: 2016
卷: 22, 期: 8 起始页码: 2939
结束页码: 2956
语种: 英语
英文关键词: carbon mineralisation
; deep plowing
; deep tillage
; long-term field trials
; SOC burial
; soil organic carbon
; SOM stability
; subsoils
Scopus关键词: agricultural soil
; burial (geology)
; carbon cycle
; incubation
; mineralization
; plowing
; soil carbon
; soil organic matter
; tillage
; topsoil
英文摘要: Subsoils play an important role within the global C cycle, since they have high soil organic carbon (SOC) storage capacity due to generally low SOC concentrations. However, measures for enhancing SOC storage commonly focus on topsoils. This study assessed the long-term storage and stability of SOC in topsoils buried in arable subsoils by deep ploughing, a globally applied method for breaking up hard pans and improving soil structure to optimize crop growing conditions. One effect of deep ploughing is translocation of SOC formed near the surface into the subsoil, with concomitant mixing of SOC-poor subsoil material into the ‘new’ topsoil. Deep-ploughed croplands represent unique long-term in situ incubations of SOC-rich material in subsoils. In this study, we sampled five loamy and five sandy soils that were ploughed to 55–90 cm depth 35–50 years ago. Adjacent, similarly managed but conventionally ploughed subplots were sampled as reference. The deep-ploughed soils contained on average 42 ± 13% more SOC than the reference subplots. On average, 45 years after deep ploughing, the ‘new’ topsoil still contained 15% less SOC than the reference topsoil, indicating long-term SOC accumulation potential in the topsoil. In vitro incubation experiments on the buried sandy soils revealed 63 ± 6% lower potential SOC mineralisation rates and also 67 ± 2% lower SOC mineralisation per unit SOC in the buried topsoils than in the reference topsoils. Wider C/N ratio in the buried sandy topsoils than in the reference topsoils indicates that deep ploughing preserved SOC. The SOC mineralisation per unit SOC in the buried loamy topsoils was not significantly different from that in the reference topsoils. However, 56 ± 4% of the initial SOC was preserved in the buried topsoils. It can be concluded that deep ploughing contributes to SOC sequestration by enlarging the storage space for SOC-rich material. © 2016 John Wiley & Sons Ltd. 资助项目: Don, A.
; Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, Germany
; 电子邮件: axel.don@thuenen.de
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61345
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, Braunschweig, Germany; Institute of Geoecology, Technische Universität Braunschweig, Langer Kamp 19c, Braunschweig, Germany
Recommended Citation:
Alcántara V.,Don A.,Well R.,et al. Deep ploughing increases agricultural soil organic matter stocks[J]. Global Change Biology,2016-01-01,22(8)