| 严重退化红壤植被恢复后有机质富集和团聚体稳定性 |
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| 作者姓名： | ZHANG Bin PENG Xin-Hua |
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| 作者单位： | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008,China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （No. 40071055）. |
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| 摘 要： | Three types of soils： an eroded barren soil under continuous fallow, an eroded soil transplanted with Lespedeza shrubs （Lespedeza bieolor）, and an eroded soil transplanted with camphor tree （Cinnaraomum camphora） were investigated to quantify organic matter pools and aggregates in reforested soils using physical fractionation techniques and to determine aggregate stability in relation to the enrichment of soil organic carbon （SOC）. Soil organic matter （SOM） was physically fractionalized into free particulate organic matter （fPOM）, occluded particulate organic matter （oPOM）, and mineralassociated organic matter （mOM）. The SOM was concentrated on the surface soil （0 5 cm）, with an average C sequestration rate of 20-25 g C m^-2 year^-1 over 14 years. As compared to the eroded barren land, organic C content of fPOM, oPOM, and mOM fractions of the soil under Lespedeza and under camphor tree increased 12-15, 45-54, and 3.1-3.5 times, respectively. A linear relationship was found between aggregate stability and organic C （r^2 = 0.45, P 〈 0.01）, oPOM （r^2 = 0.34, P 〈 0.05）, and roOM （r^2 = 0.46, P 〈 0.01） of aggregates. The enrichment of organic C improved aggregate stability of the soil under Lespedeza but not that under camphor tree. However, further research is needed on the physical and biological processes involved in the interaction of soil aggregation and SOC sequestration in ecosystem.
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| 关 键 词： | 土壤化学 有机物质 凝集作用 碳 |
| 收稿时间： | 2006-05-20 |
| 修稿时间： | 2006-09-10 |
Organic matter enrichment and aggregate stabilization in a severely degraded ultisol after reforestation |
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| ZHANG Bin,PENG Xin-Hua.Organic matter enrichment and aggregate stabilization in a severely degraded ultisol after reforestation[J].Pedosphere,2006,16(6):699-706. |
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| Authors: | ZHANG Bin and PENG Xin-Hua |
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| Institution: | aInstitute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China) |
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| Abstract: | Three types of soils: an eroded barren soil under continuous fallow, an eroded soil transplanted with Lespedeza shrubs (Lespedeza bicolor), and an eroded soil transplanted with camphor tree (Cinnamomum camphora) were investigated to quantify organic matter pools and aggregates in reforested soils using physical fractionation techniques and to determine aggregate stability in relation to the enrichment of soil organic carbon (SOC). Soil organic matter (SOM) was physically fractionalized into free particulate organic matter (fPOM), occluded particulate organic matter (oPOM), and mineral-associated organic matter (mOM). The SOM was concentrated on the surface soil (0–5 cm), with an average C sequestration rate of 20–25 g C m−2 year−1 over 14 years. As compared to the eroded barren land, organic C content of fPOM, oPOM, and mOM fractions of the soil under Lespedeza and under camphor tree increased 12–15, 45–54, and 3.1–3.5 times, respectively. A linear relationship was found between aggregate stability and organic C (r2 = 0.45, P < 0.01), oPOM (r2 = 0.34, P < 0.05), and mOM (r2 = 0.46, P < 0.01) of aggregates. The enrichment of organic C improved aggregate stability of the soil under Lespedeza but not that under camphor tree. However, further research is needed on the physical and biological processes involved in the interaction of soil aggregation and SOC sequestration in ecosystem. |
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| Keywords: | aggregate stability reforestation organic matter fractions soil C sequestration |
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