Managing Soil Organic Carbon Concentration by Cropping Systems and Fertilizers in the North China Plain - Principles of Sustainable Soil Management in Agroecosystems - page 199

been returned to the soil since the transition from family farming to commercial
farming.
Thus, an increase in the SOC concentration over time is related not only to the
adoption of advanced agricultural techniques, but also to the transition of land use
objective and the economic development. However, depletion of groundwater and
low availability of water are major constraints to increasing in SOC concentration
and agricultural intensification in the NCP.

ACKNOWLEDGMENTS
Funding for this research was supported by a Special Fund for National Land
Resource-scientific Research from the National Ministry of Land and Resources,
China (201011006-3), Natural Science Foundation of China Nos. 70573111 and
70673104.

ABBREVIATIONS
C V: coefficient of variation
GDP: gross domestic product
GPS: global positioning system
RMPs: recommended management practices
SNSS: Second National Soil Survey of China

SOC: soil organic carbon

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