DOI: 10.1111/gcb.13720
论文题名: Soil carbon sequestration potential of permanent pasture and continuous cropping soils in New Zealand
作者: Mcnally S.R. ; Beare M.H. ; Curtin D. ; Meenken E.D. ; Kelliher F.M. ; Calvelo Pereira R. ; Shen Q. ; Baldock J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
语种: 英语
英文关键词: Agriculture
; Allophanic
; C sequestration potential
; Grassland
; Soil C stabilization
; Soil organic carbon
英文摘要: Understanding soil organic carbon (SOC) sequestration is important to develop strategies to increase the SOC stock and, thereby, offset some of the increases in atmospheric carbon dioxide. Although the capacity of soils to store SOC in a stable form is commonly attributed to the fine (clay + fine silt) fraction, the properties of the fine fraction that determine the SOC stabilization capacity are poorly known. The aim of this study was to develop an improved model to estimate the SOC stabilization capacity of Allophanic (Andisols) and non-Allophanic topsoils (0-15 cm) and, as a case study, to apply the model to predict the sequestration potential of pastoral soils across New Zealand. A quantile (90th) regression model, based on the specific surface area and extractable aluminium (pyrophosphate) content of soils, provided the best prediction of the upper limit of fine fraction carbon (FFC) (i.e. the stabilization capacity), but with different coefficients for Allophanic and non-Allophanic soils. The carbon (C) saturation deficit was estimated as the difference between the stabilization capacity of individual soils and their current C concentration. For long-term pastures, the mean saturation deficit of Allophanic soils (20.3 mg C g-1) was greater than that of non-Allophanic soils (16.3 mg C g-1). The saturation deficit of cropped soils was 1.14-1.89 times that of pasture soils. The sequestration potential of pasture soils ranged from 10 t C ha-1 (Ultic soils) to 42 t C ha-1 (Melanic soils). Although meeting the estimated national soil C sequestration potential (124 Mt C) is unrealistic, improved management practices targeted to those soils with the greatest sequestration potential could contribute significantly to off-setting New Zealand's greenhouse gas emissions. As the first national-scale estimate of SOC sequestration potential that encompasses both Allophanic and non-Allophanic soils, this serves as an informative case study for the international community. © 2017 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61155
Appears in Collections: 影响、适应和脆弱性
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作者单位: New Zealand Institute for Plant and Food Research Limited Christchurch New Zealand; AgResearch Lincoln Research Centre Christchurch New Zealand; Soil and Earth Sciences Department Institute of Agriculture and Environment Massey University Palmerston North New Zealand; CSIRO Land and Water Glen Osmond, SA Australia
Recommended Citation:
Mcnally S.R.,Beare M.H.,Curtin D.,et al. Soil carbon sequestration potential of permanent pasture and continuous cropping soils in New Zealand[J]. Global Change Biology,2017-01-01