DOI: 10.1111/gcb.13573
论文题名: Continuous soil carbon storage of old permanent pastures in Amazonia
作者: Stahl C. ; Fontaine S. ; Klumpp K. ; Picon-Cochard C. ; Grise M.M. ; Dezécache C. ; Ponchant L. ; Freycon V. ; Blanc L. ; Bonal D. ; Burban B. ; Soussana J.-F. ; Blanfort V.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 8 起始页码: 3382
结束页码: 3392
语种: 英语
英文关键词: carbon storage
; CN coupling
; deep soil
; mixed-grass pasture
; native forest
英文摘要: Amazonian forests continuously accumulate carbon (C) in biomass and in soil, representing a carbon sink of 0.42–0.65 GtC yr−1. In recent decades, more than 15% of Amazonian forests have been converted into pastures, resulting in net C emissions (~200 tC ha−1) due to biomass burning and litter mineralization in the first years after deforestation. However, little is known about the capacity of tropical pastures to restore a C sink. Our study shows in French Amazonia that the C storage observed in native forest can be partly restored in old (≥24 year) tropical pastures managed with a low stocking rate (±1 LSU ha−1) and without the use of fire since their establishment. A unique combination of a large chronosequence study and eddy covariance measurements showed that pastures stored between −1.27 ± 0.37 and −5.31 ± 2.08 tC ha−1 yr−1 while the nearby native forest stored −3.31 ± 0.44 tC ha−1 yr−1. This carbon is mainly sequestered in the humus of deep soil layers (20–100 cm), whereas no C storage was observed in the 0- to 20-cm layer. C storage in C4 tropical pasture is associated with the installation and development of C3 species, which increase either the input of N to the ecosystem or the C:N ratio of soil organic matter. Efforts to curb deforestation remain an obvious priority to preserve forest C stocks and biodiversity. However, our results show that if sustainable management is applied in tropical pastures coming from deforestation (avoiding fires and overgrazing, using a grazing rotation plan and a mixture of C3 and C4 species), they can ensure a continuous C storage, thereby adding to the current C sink of Amazonian forests. © 2016 John Wiley & Sons Ltd 资助项目: Stahl, C.
; CIRAD, UMR Selmet, Campus International de BaillarguetFrance
; 电子邮件: clement.stahl@ecofog.gf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60884
Appears in Collections: 影响、适应和脆弱性
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作者单位: CIRAD, UMR Selmet, Campus International de Baillarguet, Montpellier, France; Department of Biology, University of Antwerp, Wilrijk, Belgium; INRA, UMR 0745 Ecofog, Campus Agronomique, Kourou, France; INRA, UR 874, Grassland Ecosystem Research Team, Clermont-Ferrand, France; Embrapa Amazônia Oriental, Empresa Brasileira de Pesquisa Agropecuária, EMBRAPA, Tv. Enéas Pinheiro s/n, Belém Pará, Brazil; CIRAD, UR 105 ‘Forêts et sociétés’, Montpellier, France; INRA, UMR 1137 EEF, Champenoux, France
Recommended Citation:
Stahl C.,Fontaine S.,Klumpp K.,et al. Continuous soil carbon storage of old permanent pastures in Amazonia[J]. Global Change Biology,2017-01-01,23(8)