globalchange  > 气候减缓与适应
DOI: 10.1002/2017JG004269
Scopus记录号: 2-s2.0-85040091541
论文题名:
Soil Carbon Dynamics in Soybean Cropland and Forests in Mato Grosso, Brazil
作者: Nagy R.C.; Porder S.; Brando P.; Davidson E.A.; Figueira A.M.E.S.; Neill C.; Riskin S.; Trumbore S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:1
起始页码: 18
结束页码: 31
语种: 英语
英文关键词: agriculture ; Brazil ; isotopes ; land use ; soil carbon ; tropical forest
Scopus关键词: agricultural soil ; carbon sequestration ; concentration (composition) ; decomposition ; deforestation ; intensive agriculture ; soil carbon ; soil organic matter ; soil surface ; soil temperature ; soybean ; tropical soil ; Brazil ; Mato Grosso ; Glycine max
英文摘要: Climate and land use models predict that tropical deforestation and conversion to cropland will produce a large flux of soil carbon (C) to the atmosphere from accelerated decomposition of soil organic matter (SOM). However, the C flux from the deep tropical soils on which most intensive crop agriculture is now expanding remains poorly constrained. To quantify the effect of intensive agriculture on tropical soil C, we compared C stocks, radiocarbon, and stable C isotopes to 2 m depth from forests and soybean cropland created from former pasture in Mato Grosso, Brazil. We hypothesized that soil disturbance, higher soil temperatures (+2°C), and lower OM inputs from soybeans would increase soil C turnover and deplete C stocks relative to nearby forest soils. However, we found reduced C concentrations and stocks only in surface soils (0–10 cm) of soybean cropland compared with forests, and these differences could be explained by soil mixing during plowing. The amount and Δ14C of respired CO2 to 50 cm depth were significantly lower from soybean soils, yet CO2 production at 2 m deep was low in both forest and soybean soils. Mean surface soil δ13C decreased by 0.5‰ between 2009 and 2013 in soybean cropland, suggesting low OM inputs from soybeans. Together these findings suggest the following: (1) soil C is relatively resistant to changes in land use and (2) conversion to cropland caused a small, measurable reduction in the fast-cycling C pool through reduced OM inputs, mobilization of older C from soil mixing, and/or destabilization of SOM in surface soils. ©2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114741
Appears in Collections:气候减缓与适应

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作者单位: Ecology and Evolutionary Biology, Brown University, Providence, RI, United States; Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, United States; Earth Lab, University of Colorado Boulder, Boulder, CO, United States; Instituto de Pesquisa Ambiental da Amazônia, Brasília, Brazil; Woods Hole Research Center, Falmouth, MA, United States; Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, United States; Natural Science Program, Federal University of Western Pará, Santarém, Brazil; Max Planck Institute for Biogeochemistry, Jena, Germany; Earth System Science, University of California, Irvine, CA, United States

Recommended Citation:
Nagy R.C.,Porder S.,Brando P.,et al. Soil Carbon Dynamics in Soybean Cropland and Forests in Mato Grosso, Brazil[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)
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