globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-9980-3
Scopus记录号: 2-s2.0-84904806213
论文题名:
Soil organic carbon dynamics 75 years after land-use change in perennial grassland and annual wheat agricultural systems
作者: Beniston J.W.; DuPont S.T.; Glover J.D.; Lal R.; Dungait J.A.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 120, 期:2018-01-03
起始页码: 37
结束页码: 49
语种: 英语
英文关键词: Deep-rooting perennial ; Soil carbon turnover ; Soil organic carbon ; Soil particle size fractionation ; Subsoil ; Tallgrass prairie grassland
Scopus关键词: Triticum aestivum
英文摘要: The dynamics of roots and soil organic carbon (SOC) in deeper soil layers are amongst the least well understood components of the global C cycle, but essential if soil C is to be managed effectively. This study utilized a unique set of land-use pairings of harvested tallgrass prairie grasslands (C4) and annual wheat croplands (C3) that were under continuous management for 75 years to investigate and compare the storage, turnover and allocation of SOC in the two systems to 1 m depth. Cropland soils contained 25 % less SOC than grassland soils (115 and 153 Mg C ha-1, respectively) to 1 m depth, and had lower SOC contents in all particle size fractions (2000-250, 250-53, 53-2 and <2 μm), which nominally correspond to SOC pools with different stability. Soil bulk δ13C values also indicated the significant turnover of grassland-derived SOC up to 80 cm depth in cropland soils in all fractions, including deeper (>40 cm) layers and mineral-associated (<53 μm) SOC. Grassland soils had significantly more visible root biomass C than cropland soils (3.2 and 0.6 Mg ha-1, respectively) and microbial biomass C (3.7 and 1.3 Mg ha-1, respectively) up to 1 m depth. The outcomes of this study demonstrated that: (i) SOC pools that are perceived to be stable, i.e. subsoil and mineral-associated SOC, are affected by land-use change; and, (ii) managed perennial grasslands contained larger SOC stocks and exhibited much larger C allocations to root and microbial pools than annual croplands throughout the soil profile. © 2014 Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83685
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Carbon Management and Sequestration Center, School of Environment and Natural Resources, The Ohio State University, Columbus, OH, 43210, United States; Penn State Extension, The Pennsylvania State University, Nazareth, PA, 18064, United States; Bureau for Food Security, U.S. Agency for International Development, WA, DC, 20523, United States; Department of Sustainable Systems and Grassland Science, Rothamsted Research North Wyke, Okehampton, Devon, EX20 2SB, United Kingdom; U.S. Department of Agriculture, Agricultural Research Service, Jornada Experimental Range, New Mexico State University, Las Cruces, NM, United States

Recommended Citation:
Beniston J.W.,DuPont S.T.,Glover J.D.,et al. Soil organic carbon dynamics 75 years after land-use change in perennial grassland and annual wheat agricultural systems[J]. Biogeochemistry,2014-01-01,120(2018-01-03)
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