余明, 郑新颖, 薛立. 火力楠林地土壤碳和养分储量垂直分布研究[J]. 华南农业大学学报, 2019, 40(4): 77-82. DOI: 10.7671/j.issn.1001-411X.201809004
    引用本文: 余明, 郑新颖, 薛立. 火力楠林地土壤碳和养分储量垂直分布研究[J]. 华南农业大学学报, 2019, 40(4): 77-82. DOI: 10.7671/j.issn.1001-411X.201809004
    YU Ming, ZHENG Xinying, XUE Li. Vertical distribution of soil carbon and nutrient storages under a Michelia macclurei plantation[J]. Journal of South China Agricultural University, 2019, 40(4): 77-82. DOI: 10.7671/j.issn.1001-411X.201809004
    Citation: YU Ming, ZHENG Xinying, XUE Li. Vertical distribution of soil carbon and nutrient storages under a Michelia macclurei plantation[J]. Journal of South China Agricultural University, 2019, 40(4): 77-82. DOI: 10.7671/j.issn.1001-411X.201809004

    火力楠林地土壤碳和养分储量垂直分布研究

    Vertical distribution of soil carbon and nutrient storages under a Michelia macclurei plantation

    • 摘要:
      目的  对10年生火力楠Michelia macclurei人工林不同土层的土壤碳储量及养分储量进行研究,以了解火力楠人工林的固碳能力和土壤养分状况。
      方法  在各标准地内用五点取样法,沿土壤剖面按0~20、20~40、40~60、60~80和80~100 cm分层采集土壤样品。用常规方法测定土壤pH以及有机质、全N、全P、全K、碱解N、有效P和速效K的含量,并计算土壤碳储量和养分储量。
      结果  林分土壤呈酸性(pH3.54~3.79)。火力楠林地的土壤碳含量随着土壤深度的增加而下降。火力楠林地各层土壤的全P和全K含量差异不显著,全N、碱解N、有效P和速效K含量均随着土层的加深呈现下降的趋势。火力楠林地0~100 cm土壤的碳储量为259.26 t·hm−2,N、P和K储量分别为21.50、7.47和209.42 t·hm−2。此外,随着土壤深度的增加,各层土壤的碳储量以及P、K储量总体呈现增加的趋势。
      结论  火力楠林地的土壤碳储量高于全国平均水平,说明火力楠林地土壤具有较好的碳汇潜能和改良土壤的能力。深层土壤的碳储量以及P、K储量大于表层土壤,说明表层土壤的固碳能力较低且淋溶侵蚀较为严重。在今后的经营管理过程中,应注意防治水土流失,增强土壤表层的固碳能力。

       

      Abstract:
      Objective  Carbon and nutrient storages in different soil layers were studied in a 10-years-old Michelia macclurei plantation, in order to understand the soil carbon sequestration capacity and nutrient status of the M. macclurei plantation.
      Method  Five-point sampling method was used to collect soil samples from 0−20, 20−40, 40−60, 60−80 and 80−100 cm depth layers. Soil pH, contents of organic matter, total N, total P, total K, alkalized N, available P and rapidly available K were determined by routine methods. Carbon and nutrient storages were calculated.
      Result  Soil under M. macclurei plantation was acidic (pH3.54−3.79). Soil carbon content ofM. macclurei plantation decreased with the increase of soil depth. There was no significant difference in total P and K contents among different soil layers, while the contents of total N, alkalized N, available P and rapidly available K decreased with the increase of soil depth. Soil carbon storage of M. macclurei plantation in 0−100 cm depth layer was 259.26 t·hm−2. The storages of soil N, P and K in 0−100 cm depth layer were 21.50, 7.47 and 209.42 t·hm−2, respectively. Soil carbon, P and K storages of each layer increased with increasing soil depth.
      Conclusion  Soil carbon storage of M. macclurei plantation is higher than the average level over all the nation, indicating that the soil in this stand has higher carbon sink potential and ability of improving the soil. There are more soil carbon, P and K storages in deeper layer than in soil surface, indicating poor carbon sequestration capacity and severe leaching erosion in surface soil. It is suggested that in the future management, attention should be paid to prevent soil erosion and enhance the carbon sequestration capacity of surface soil.

       

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