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Soil carbon and nitrogen stores and storage potential as affected by land-use
Biogeochemistry (2007) 82:127-138
DOI 10.1007/s10533-006-9058-y
Soil carbon and nitrogen stores and storage potential
as affected by land-use in an agro-pastoral ecotone
of northern China
Zhiyong Zhou * Osbert J. Sun * Jianhui Huang i
Linghao Li * Ping Liu * Xingguo Han
Received: 4 February 2006/Accepted: 8 September 2006/Published online: 20 October 2006
? Springer Science+Business Media B.V. 2006
Abstract Equilibrium carbon stock is the result
of a balance between inputs and outflows to the
pool. Changes in land-use are likely to alter such
balance, resulting in different carbon stores under
different land-use types in addition to the impacts
of global climate change. In an agro-pastoral
ecotone of Inner Mongolia, northern China, we
investigated productivity and belowground car
bon and nitrogen stores under six different types
of land-uses, namely free grazing (FG), grazing
exclusion (GE), mowing (MW), corn plantation
(CP), fallow (FL), and alfalfa pasture (AP), and
their impacts on litter and fine roots in semiarid
grassland ecosystems. We found that there were
great variations in aboveground net primary
production (ANPP) across the six land-use types,
with CP having markedly high ANPP; the FG had
significantly reduced soil organic carbon (SOC)
and nitrogen stores (SON) to 100 cm depth
compared with all other types of land uses, while
Z. Zhou 0. J. Sun (F1) J. Huang L. Li
P. Liu X. Han
Laboratory of Quantitative Vegetation Ecology,
Institute of Botany, The Chinese Academy of
Sciences, 20 Nanxincun, Xiangshan, Haidian District,
Beijing 100093, China
e-mail: osbertsun@ibcas.ac.cn
Z. Zhou P. Liu
Graduate School of the Chinese Academy of
Sciences, Beijing 100049, China
very little litter accumulation was found on sites
of the FG and CP. The top 20 cm of soils
accounted for about 80% of the root carbon and
nitrogen, with very little roots being found below
50 cm. About 60% of SOC and SON were stored
in the top 30 cm layer. L
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