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    冯嘉仪, 储双双, 王婧, 等. 华南地区几种典型人工林土壤有机碳密度及其与土壤物理性质的关系[J]. 华南农业大学学报, 2018, 39(1): 83-90. DOI: 10.7671/j.issn.1001-411X.2018.01.014
    引用本文: 冯嘉仪, 储双双, 王婧, 等. 华南地区几种典型人工林土壤有机碳密度及其与土壤物理性质的关系[J]. 华南农业大学学报, 2018, 39(1): 83-90. DOI: 10.7671/j.issn.1001-411X.2018.01.014
    shu
    FENG Jiayi, CHU Shuangshuang, WANG Jing, WU Daoming, MO Qifeng, GAO Jie, LIN Jiahui, ZENG Shucai. Soil organic carbon density and its relationship with soil physical properties of typical plantations in South China[J]. Journal of South China Agricultural University, 2018, 39(1): 83-90. DOI: 10.7671/j.issn.1001-411X.2018.01.014
    Citation: FENG Jiayi, CHU Shuangshuang, WANG Jing, WU Daoming, MO Qifeng, GAO Jie, LIN Jiahui, ZENG Shucai. Soil organic carbon density and its relationship with soil physical properties of typical plantations in South China[J]. Journal of South China Agricultural University, 2018, 39(1): 83-90. DOI: 10.7671/j.issn.1001-411X.2018.01.014
    shu

    华南地区几种典型人工林土壤有机碳密度及其与土壤物理性质的关系

    Soil organic carbon density and its relationship with soil physical properties of typical plantations in South China

      摘要
    • 摘要:
      目的  探讨华南地区桉树Eucalyptus urophylla人工林等4种林分土壤有机碳积累特征，为森林土壤碳库管理提供理论依据。
      方法  以桉树、杉木Cunninghamia lanceolata、马尾松Pinus massoniana人工林以及经济林的0~100 cm土层土壤为研究对象，对比分析了4种林分类型的土壤有机碳含量和有机碳密度及其垂直分布特征，并进一步分析土壤有机碳与土壤容重、孔隙度等物理性质的相关性。
      结果  4种林分0~100 cm土层土壤有机碳含量为8.52~11.84 g·kg–1，有机碳密度为2.22~3.04 kg·m–2；经济林的土壤有机碳含量和密度显著高于其他林分，而桉树人工林与杉木、马尾松人工林之间差异不显著；不同林分和不同土层深度之间有机碳含量和密度均表现出中度的变异特征。土壤有机碳含量和密度均随着土层深度的增加而减小，0~40 cm土层的有机碳密度占整个剖面的50%以上。有机碳密度(y)与有机碳含量(x)的拟合曲线决定系数和斜率均随着土层深度的增加呈现递增趋势。有机碳含量和密度均与土壤容重呈极显著负相关，有机碳含量与毛管持水量、总孔隙度、毛管孔隙度、非毛管孔隙度和土壤通气孔隙度呈极显著正相关，有机碳密度仅与毛管孔隙度和非毛管孔隙度呈极显著正相关。
      结论  与杉木和马尾松人工林比，桉树人工林并未显著减弱土壤有机碳的积累效果，有机碳分布主要集中在土壤表层，土壤容重、毛管孔隙度和通气孔隙度极显著影响林地土壤有机碳积累。

       

      Abstract:
      Objective  To investigate the effects of Eucalyptus forest and three other stand types in South China on the accumulation of soil organic carbon, and provide a theoretical basis for the management of forest soil carbon pool.
      Method  Four kinds of plantations, including E. urophylla, Cunninghamia lanceolate and Pinus massoniana plantations and economic forest, were chosen. Their soil organic carbon content, organic carbon density and the vertical distribution characteristics of organic carbon density in 0–100 cm soil layers were analyzed. The correlations between soil organic carbon and soil physical properties were further analyzed.
      Result  For the 0–100 cm soil layer, the soil organic carbon content of four stands ranged from 8.52 to 11.84 g·kg–1, and the organic carbon density ranged from 2.22 to 3.04 kg·m–2. Economic forest had the highest soil organic carbon content and density, and there were no significant differences in soil organic carbon content and density among the plantations of E. urophylla, C. lanceolata and P. massoniana. Soil organic carbon content and density in both different stands and different soil depths showed moderate variability. Soil organic carbon content and density decreased with the increase of soil depth, and the organic carbon density of 0–40 cm soil layer accounted for more than 50% of the whole vertical section. The regression coefficient and slope of organic carbon density (y) and organic carbon content (x) showed an increasing trend with the increase of soil depth. Both organic carbon content and density significantly negatively correlated with soil bulk density. The organic carbon content significantly positively correlated with capillary water-holding capacity, total porosity, capillary porosity, non-capillary porosity and aeration porosity. The organic carbon density significantly positively correlated with capillary porosity and non-capillary porosity.
      Conclusion  Compared with C. lanceolata and P. massoniana, E. urophylla plantation did not significantly reduce the accumulation of soil organic carbon. Most soil organic carbon was accumulated in the upper soil layer. Soil bulk density, capillary porosity and aeration porosity are all crucial to soil organic carbon accumulation.

       

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