| Studies on soil organic carbon of density-isolated fractions and water-stable aggregates under different types of land use on black soils |
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| 作者姓名： | Haibo LI Xiaozeng HAN Feng WANG Yunfa QIAO Baoshan XING |
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| 作者单位： | [1]National Field Research Station of Agro-ecosystem m Hadun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150081, China [2]Department of Plant, Soil and lnsect Sciences, University of Massachusetts, MA 01003, USA [3]Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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| 摘 要： | The experiment was conducted to determine the organic carbon concentrations of black soils by using density fractionation and wet-sieving of aggregates into five size fractions. Soil samples （0-20 cm layer） were collected from the following experiment sites （National Field Research Station of Agro-ecosystem in Hailun, Northeast of China）： （1） grassland （GL）, formerly cropped, and but fallowed in 1985 with Leymus chinesis as the dominant species; （2） bareland （BL）, like grassland, fallowed in 1985, but grasses were eliminated periodically during the plant growth stages; （3） cropland, three treatments in a long-term site experiment established in 1993 were selected, including no fertilizer applied （NF）, nitrogen and phosphorus fertilizers applied （NP）, and NP fertilizer amended with organic materials （NPOM）. The results showed that the total organic carbon （TOC） concentrations within five experiment sites differed significantly at P〈0.01. The natural ecosystem subjected to human disturbance or transferred into cropland resulted in loss of TOC, however, TOC concentrations increased significantly with chemical fertilizer plus organic manure incorporated into cropland. The OC concentrations in the free light fraction （free-LF） and heavy fraction （HF） had significant correlations with those of TOC in the whole soil at P〈0.01, which indicated that the accumulation of free-LF and HF was very important for the net increase in the TOC. In GL more than 90% of the aggregate separates was larger than 0.25 mm, in which aggregates larger than 2 mm accounted for 44%, as a result of physical enmeshing of fine roots.
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| 关 键 词： | 土壤成分 有机碳 土地利用 黑土 |
Studies on soil organic carbon of density-isolated fractions and water-stable aggregates under different types of land use on black soils |
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| Haibo LI Xiaozeng HAN Feng WANG Yunfa QIAO Baoshan XING.Studies on soil organic carbon of density-isolated fractions and water-stable aggregates under different types of land use on black soils[J].Chinese Journal of Geochemistry,2006,25(B08):266-267. |
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| Abstract: | |
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| Keywords: | soil organic carbon land use density fractions water-stable aggregate black soil |
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