| 开垦对内蒙古温带草地土壤不同有机碳组分的影响(英文) |
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| 引用本文： | 齐玉春,董云社,彭琴,肖胜生,何亚婷,刘欣超,孙良杰,贾军强,杨智杰.开垦对内蒙古温带草地土壤不同有机碳组分的影响(英文)[J].地理学报(英文版),2012,22(2):315-328. |
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| 作者姓名： | 齐玉春 董云社 彭琴 肖胜生 何亚婷 刘欣超 孙良杰 贾军强 杨智杰 |
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| 作者单位： | Institute of Geographic Sciences and Natural Resources Research, CAS;Jiangxi Provincial Research Institute for Soil and Water Conservation;Graduate University of Chinese Academy of Sciences;Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Normal University, Ministry of Education |
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| 基金项目： | National Natural Science foundation of China,No.40730105;No.40973057;No.41073061;Knowledge Innovation Program of the Chinese Academy of Sciences,No.KZCX2-EW-302 |
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| 摘 要： | Cultivation is one of the most important human activities affecting the grassland ecosystem besides grazing, but its impacts on soil total organic carbon (C), especially on the liable organic C fractions have not been fully understood yet. In this paper, the role of cropping in soil organic C pool of different fractions was investigated in a meadow steppe region in Inner Mongolia of China, and the relationships between different C fractions were also discussed. The results indicated that the concentrations of different C fractions at steppe and cultivated land all decreased progressively with soil depth. After the conversion from steppe to spring wheat field for 36 years, total organic carbon (TOC) concentration at the 0 to 100 cm soil depth has decreased by 12.3% to 28.2%, and TOC of the surface soil horizon, especially those of 0-30 cm decreased more significantly (p<0.01). The dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at the depth of 0-40 cm were found to have decreased by 66.7% to 77.1% and 36.5% to 42.4%, respectively. In the S.baicalensis steppe, the ratios of soil DOC to TOC varied between 0.52% and 0.60%, and those in the spring wheat field were only in the range of 0.18%-0.20%. The microbial quotients (qMBs) in the spring wheat field, varying from 1.11% to 1.40%, were also lower than those in the S. baicalensis steppe, which were in the range of 1.50%-1.63%. The change of DOC was much more sensitive to cultivation disturbance. Soil TOC, DOC, and MBC were significantly positive correlated with each other in the S. baicalensis steppe, but in the spring wheat field, the correlativity between DOC and TOC and that between DOC and MBC did not reach the significance level of 0.05.
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| 关 键 词： | temperate grassland cultivation soil total organic carbon dissolved organic carbon microbial biomass carbon |
Effects of a conversion from grassland to cropland on the different soil organic carbon fractions in Inner Mongolia, China |
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| Yuchun Qi,Yunshe Dong,Qin Peng,Shengsheng Xiao,Yating He,Xinchao Liu,Liangjie Sun,Junqiang Jia,Zhijie Yang.Effects of a conversion from grassland to cropland on the different soil organic carbon fractions in Inner Mongolia, China[J].Journal of Geographical Sciences,2012,22(2):315-328. |
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| Authors: | Yuchun Qi Yunshe Dong Qin Peng Shengsheng Xiao Yating He Xinchao Liu Liangjie Sun Junqiang Jia Zhijie Yang |
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| Institution: | 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3. Jiangxi Provincial Research Institute for Soil and Water Conservation, Nanchang 330029, China; 4. Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Normal University, Ministry of Education, Fuzhou 350007, China |
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| Abstract: | Cultivation is one of the most important human activities affecting the grassland ecosystem besides grazing, but its impacts
on soil total organic carbon (C), especially on the liable organic C fractions have not been fully understood yet. In this
paper, the role of cropping in soil organic C pool of different fractions was investigated in a meadow steppe region in Inner
Mongolia of China, and the relationships between different C fractions were also discussed. The results indicated that the
concentrations of different C fractions at steppe and cultivated land all decreased progressively with soil depth. After the
conversion from steppe to spring wheat field for 36 years, total organic carbon (TOC) concentration at the 0 to 100 cm soil
depth has decreased by 12.3% to 28.2%, and TOC of the surface soil horizon, especially those of 0–30 cm decreased more significantly
(p<0.01). The dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at the depth of 0–40 cm were found to have
decreased by 66.7% to 77.1% and 36.5% to 42.4%, respectively. In the S. baicalensis steppe, the ratios of soil DOC to TOC varied between 0.52% and 0.60%, and those in the spring wheat field were only in the
range of 0.18%–0.20%. The microbial quotients (qMBs) in the spring wheat field, varying from 1.11% to 1.40%, were also lower
than those in the S. baicalensis steppe, which were in the range of 1.50%–1.63%. The change of DOC was much more sensitive to cultivation disturbance. Soil
TOC, DOC, and MBC were significantly positive correlated with each other in the S. baicalensis steppe, but in the spring wheat field, the correlativity between DOC and TOC and that between DOC and MBC did not reach the
significance level of 0.05. |
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| Keywords: | temperate grassland cultivation soil total organic carbon dissolved organic carbon microbial biomass carbon |
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