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[1]LI Jianping,CHEN Jing,XIE Yingzhong,et al.Dynamics of Carbon Storage and Its Sequestration Rate in Deeper Soil Layers Following Long-term Fenced Grasslands[J].Research of Soil and Water Conservation,2016,23(06):1-8.

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Dynamics of Carbon Storage and Its Sequestration Rate in Deeper Soil Layers Following Long-term Fenced Grasslands

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 06 Page number: 1-8 Column: Public date: 2016-12-28

Title:: Dynamics of Carbon Storage and Its Sequestration Rate in Deeper Soil Layers Following Long-term Fenced Grasslands

Author(s):: LI Jianping¹, CHEN Jing¹, XIE Yingzhong^1,2, XI Jie³; 1. School of Agriculture, Ningxia University, Yinchuan, 750021, China;
2. Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China;
3. Workstation of Grassland in Guyuan, Guyuan 756000, China

Keywords:: SOC storage; SOC sequestration; rate of C sequestration; C/N ratio; fenced grassland

CLC:: S153.6

DOI:: -

Abstract:: In order to measure soil carbon and nitrogen storages and their sequestration rates in long-term fenced grasslands, different period fenced grasslands in variety location stand for sequential vegetation restoration in Guyuan Yunwushan of the Loess Plateau were selected. The results showed that soil organic carbon(SOC) storage in each soil layers of 0-500 cm soil depth, in 30 years of fenced grassland is significantly higher than in 10 years of fenced grassland and grazing grassland, but there was no significant difference of SOC storage in each soil layer between 10 years of fenced grassland and grazing grassland; there were also no significant difference of soil total nitrogen (STN) storage in different soil layers between 30 years of fenced grassland and 10 years of fenced grassland and grazing grassland, while STN storage in the 30 years of fenced grassland was significantly higher than 10 years of fenced grassland and grazing grassland; meanwhile, during the 30 years of enclosure, the SOC and STN sequestration accumulated dramatically between the 10^th year and the 30^th year, the values were (482.5±39.3) Mg/hm² and (27.7±2.4) Mg/hm², respectively, but during the first 10 years of fenced grassland, the amounts of SOC and STN sequestration were very small, which were (42.8±6) Mg/hm² and (3.4±2.1) Mg/hm², respectively; SOC and STN sequestration in 0-500 cm soil depth after 30 years of enclosure of was (525.3±62.0) Mg/hm² and (25.0±3.0) Mg/hm², respectively, SOC and STN sequestration rates in 0-500 cm soil depth were (17.5±2.1) Mg/(hm²·a) and (0.83±0.3) Mg/(hm²·a); C/N ratio had decreased with increase of soil depth, but it had increased with increase of fencing duration. This study demonstrated that deeper soil layers in fenced grassland have great potential for carbon sequestration, the SOC and STN accumulated mainly happened between the 10^th and 30^th years of enclosure, so, the more attention should be paid to fencing period scales and carbon and nitrogen storage in deeper soil layer in order to achieve unbiased estimate of carbon and nitrogen storage in ecological assessment.

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