生物质炭施用量对毛竹林土壤团聚体有机碳含量的影响

Effects of Biochar Addition on Organic Carbon in Aggregates of Soil under Phyllostachys edulis Forest

    摘要
  • 摘要:
    目的 通过探究不同生物质炭施用量对毛竹林土壤团聚体有机碳含量的影响，为毛竹林土壤固碳和可持续发展提供参考。
    方法 在毛竹（Phyllostachys edulis）林中设置了不同生物质炭施用量处理，即对照（CK，0 t hm−2）、低生物质炭施用（LB，5 t hm−2）、中生物质炭施用（MB，10 t hm−2）、高生物质炭施用（HB，20 t hm−2），测定一年后4种处理下土壤理化性质和不同粒级团聚体中有机碳含量。
    结果 LB、MB和HB较CK显著增加10 ~ 20 cm土壤容重数量为17.4% ~ 22.1%，降低通气度、非毛管孔隙度和最大持水量范围为21.3% ~ 22.8%、20.5% ~ 42.2%和20.1% ~ 24.5%。同时，LB和HB显著降低两土层土壤总磷含量13.6%、10.8%和16.1%、10.5%。MB较CK显著增加0 ~ 10 cm土层 > 2000 µm团聚体有机碳含量为21.5%， HB较MB显著增加10 ~ 20 cm土层53 ~ 250 µm和250 ~ 2000 µm团聚体有机碳含量为24.1%和43.0%。生物质炭施用量、土壤团聚体粒级和不同土层深度对土壤团聚体有机碳含量有显著影响，仅生物质炭与土层间交互作用显著。冗余分析显示施用生物质炭增强 > 2000 µm团聚体与土壤有机碳、土壤微生物量氮、土壤全氮之间正相关关系，LB、MB使土壤团聚体结构与土壤容重呈负相关。
    结论 10 ~ 20 t hm−2的生物质炭施用量能显著提高毛竹林土壤团聚体有机碳含量，提高毛竹林土壤增汇潜力。

     

    Abstract:
    Objective The aims were to explore the effects of different application rates of biochar on organic carbon content in aggregates of soil uner Phyllostachys edulis forest, which would provide a reference for the sustainable development of soil carbon sequestration.
    Method Four biochar addition treatments (control: CK, 0 t ha−2; low biochar: LB, 5 t hm−2; medium biochar: MB, 10 t hm−2; high biochar: HB, 20 t hm−2) were set with the determination of soil physicochemical properties and the organic carbon content in different size of aggregates.
    Result Compared with the control, biochar addition significantly increased 10 − 20 cm soil bulk density by 17.4% − 22.1%, capillary porosity by 21.3% − 22.8%, non-capillary porosity by 20.5% − 42.2% and maximum water holding capacity by 20.1% − 24.5% (P < 0.05). LB and HB significantly reduced the total phosphorus contents of 0 − 10 cm and 10 − 20 cm soils by 13.6%, 10.8%, and 16.1%, 10.5% (P < 0.05), respectively. In the 0 − 10 cm soil layer, MB increased the organic carbon content of >2000 µm aggregates by 21.5% compared with the control. In the 10 ~ 20 cm soil layer, HB increased the organic carbon content of 53 − 250 µm and 250 − 2000 µm aggregates by 24.1% and 43.0%, compared with MB, respectively. With different doses of biochar addition, soil aggregate particle size and different soil depths had significant effects on the organic carbon content of soil aggregates. Only the interaction between biomass charcoal and soil horizons was significant (P < 0.05). The redundancy analysis showed that the application of biochar enhanced the positive correlation among >2000 µm aggregates and soil organic carbon, soil microbial biomass nitrogen, and total soil nitrogen. LB and MB caused a negative correlation between soil aggregate structure and soil bulk density.
    Conclusion The relative higher biochar application rates (10 − 20 t hm−2) could increase the organic carbon content and stability of soil aggregates, and improve the soil carbon sequestration potential of Phyllostachys edulis forest.

     

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