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| Effects of different land use types on storage and structure of soil organic carbon in Stipa klemenaii steppe in Inner Mongolia |
| Received:March 17, 2016 |
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| KeyWord:structure of soil organic carbon, 13C-NMR, land use type, Stipa klemenaii desert steppe |
| Author Name | Affiliation | E-mail | | QIU Xuan | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Horticulture, Shenyang Agriculture University, Shenyang 110866, China | | | ZHAO Jian-ning | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LI Wen-ya | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Horticulture, Shenyang Agriculture University, Shenyang 110866, China | | | ZHANG Nai-qin | College of Ecology and Garden Architecture, Dezhou University, Dezhou 253023, China | | | ZHU Yan | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YANG Dian-lin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Horticulture, Shenyang Agriculture University, Shenyang 110866, China | yangdianlin@cass.cn |
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| Abstract: |
| The composition and structure of soil organic carbon(SOC) are complex and includes many functional components. In order to study the influence of different land use types on SOC storage and structural characteristics in Stipa klemenaii desert steppe of Inner Mongolia, field sampling, laboratory analysis and 13C Nuclear Magnetic Resonance(13C NMR) were employed to analyze the soil bulk density, SOC content, density and storage in soil depth of 0~100 cm, and the structure of SOC in soil depth of 0~20 cm. 5 different treatments were set up, including three grazing treatments[0.50 sheep·hm-2(G0.50), 0.94 sheep·hm-2(G0.94), 1.25 sheep·hm-2(G1.25)], one enclosure and one reclamation treatments. The enclosed area was fenced excluding livestock and human disturbance while the reclamation area planted maize(Zea mays) as local general agricultural management. The results showed that:compared with the enclosed area, in the same soil layer, SOC content and density showed a decrease trend; soil bulk density showed an increase trend. With the increase of grazing intensity, SOC content and density reduces gradually. In the same treatment, the soil bulk density of S. klemenaii desert grassland firstly reduced then increased as the soil layer deepen, while the content of SOC and SOC density increased then decreased, and reached the maximum in 30~40 cm. Compared with the enclosed area, the SOC declines in the grazing and reclamation areas. In which, the SOC of the G1.25 and reclamation treatments were significantly(P<0.05) lower than the enclosed area, besides, the SOC reduce gradually with the increase of grazing intensity. The influence of different land use types on S. klemenaii desert grassland SOC structure was mainly embodied on chemicals composition, meanwhile the chemicals of SOC component has not changed. Of which, silane oxygen carbon(34.86%~37.85%), alkyl carbon(26.05%~33.87%), aromatic carbon(10.60%~17.69%) and carbonyl carbon(14.57%~16.90%) are the main compositions of SOC structure. Compared with grazing and reclamation, the soil humification index of the enclosure grassland was the biggest, which performed as enclosed area>reclamation area >G0.50 >G0.94 >G1.25; however the aromatic degree of enclosure grassland was the smallest, characterized by G1.25 >G0.94 >reclamation area >G0.50 >enclosed area. Which demonstrated that the SOC in enclosed area was more stable, and had certain significance in terms of soil carbon sequestration. |
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