| 不同轮作制度下土壤中不稳定有机碳组分的变化 |
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| 作者姓名： | NI Jin-Zhi XU Jian-Ming XIE Zheng-Miao WANG De-Jian |
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| 作者单位： | [1]CollegeofResourcesandEnvironment,ShandongAgriculturalUniversity,Taian271018（China） [2]RegionalResearchInstitute,WestVirginiaUniversity,Morgantown,WV26505-6300（USA） |
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| 基金项目： | *1Project supported by the National Key Basic Research Support Foundation (NKBRSF) of China (No.G1999011809) and the National Natural Science Foundation of China (No.49871044). |
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| 摘 要： | Taking Kenli County in the Yellow River Delta, China, as the study area and using digital satellite remote sensing techniques, cultivated land use changes and their corresponding driving forces were explored in this study. An interactive interpretation and a manual modification procedure were carried out to acquire cultivated land information. An overlay method based on classification results and a visual change detection method which was supported by land use maps were employed to detect the cultivated land changes. Based on the changes that were revealed and a spatial analysis between cultivated land use and related natural and socio-economic factors, the driving forces for cultivated land use changes in the study area were determined. The results showed a decrease in cultivated land in Kenli County of 5321.8 ha from 1987 to 1998, i.e., an average annual decrement of 483.8 ha, which occurred mainly in the central paddy field region and the northeast dry land region. Adverse human activities, soil salinization and water deficiencies were the driving forces that caused these cultivated land use changes.
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| 关 键 词： | 耕地变化 卫星遥感 监测 黄河三角洲 中国 |
Changes of labile organic carbon fractions in soils under different rotation systems |
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| NI Jin-Zhi,XU Jian-Ming,XIE Zheng-Miao,WANG De-Jian.Changes of labile organic carbon fractions in soils under different rotation systems[J].Pedosphere,2004,14(1):103-109. |
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| Authors: | NI Jin-Zhi XU Jian-Ming XIE Zheng-Miao and WANG De-Jian |
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| Institution: | School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 (China). E-mail: nijz@ustc.edu.cn;Department of Resource Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029 (China);Department of Resource Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029 (China);Department of Resource Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029 (China);Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China) |
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| Abstract: | Taking Kenli County in the Yellow River Delta, China, as the study area and using digital satellite remote sensing techniques, cultivated land use changes and their corresponding driving forces were explored in this study. An interactive interpretation and a manual modification procedure were carried out to acquire cultivated land information. An overlay method based on classification results and a visual change detection method which was supported by land use maps were employed to detect the cultivated land changes. Based on the changes that were revealed and a spatial analysis between cultivated land use and related natural and socio-economic factors, the driving forces for cultivated land use changes in the study area were determined. The results showed a decrease in cultivated land in Kenli County of 5321.8 ha from 1987 to 1998, i.e., an average annual decrement of 483.8 ha, which occurred mainly in the central paddy field region and the northeast dry land region. Adverse human activities, soil salinization and water deficiencies were the driving forces that caused these cultivated land use changes. |
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| Keywords: | 13C-NMR rotation system soil microbial biomass carbon soil water-soluble organic carbon |
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