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干热河谷新银合欢人工林土壤颗粒态有机碳氮特征

Characteristics of Particulate Organic Carbon and Nitrogen in Soil of Leucaena leucocephala Plantation in the Dry-hot Valley

    摘要
  • 摘要:
    目的 探究人工林恢复过程中的土壤颗粒态碳氮含量变化特征，为研究土壤碳氮动态对人工林恢复的响应机制提供依据。
    方法 选择金沙江元谋干热河谷天然灌草丛(对照样地，CK)和不同林龄阶段的新银合欢林地（新银合欢幼龄林(SL)、中龄林(ML)和成龄林(LL)）为研究对象，研究天然灌草丛和不同阶段新银合欢林地土壤颗粒态碳氮含量的变化特征。
    结果 与天然灌草丛相比，新银合欢林分显著影响土壤有机碳(SOC)、总氮(TN)、颗粒态有机碳(POC)、颗粒态有机氮(PON)、POC/SOC、POC/PON和颗粒态质量比例；SOC和TN含量在成龄林阶段最高，而POC、PON、POC/SOC、POC/PON均在中龄林阶段最高。
    结论 新银合欢入侵干热河谷灌草丛会显著改变土壤碳氮动态及其稳定性，成龄林阶段的土壤养分含量最高，而中龄林阶段土壤稳定性最低。该研究为综合评价新银合欢人工林在提升干热河谷土壤生态功能方面提供科学依据和数据支撑。

     

    Abstract:
    Objective To investigate the change characteristics of soil particulate carbon and nitrogen content in the process of plantation restoration and to provide references for studying the response mechanism of soil carbon and nitrogen dynamics to plantation restoration.
    Method Leucaena leucocephala plantations at young age, middle age and matured age in Yuanmou dry-hot valley were selected and the natural shrub-grass plot as the control, the change characteristics of the soil particulate carbon and nitrogen content of natural shrub-grass plot and L. leucocephala plantations with different ages were studied.
    Result Compared with the natural shrub-grass plot, the age stage of L. leucocephala plantations significantly affected the soil organic carbon (SOC), total nitrogen (TN), particulate organic carbon (POC), particulate organic nitrogen (PON), POC/SOC, POC/PON. The proportion of mass of soil particle, SOC and TN contents were the highest in the matured plantation, while the POC, PON, POC/SOC, and POC/PON were the highest in the middle aged plantation.
    Conclusion The invasion of L. leucocephala into shrubs in dry-hot valley will significantly change the dynamics of soil carbon and nitrogen and its stability. The soil nutrient content in the matured plantation is the highest, while the soil stability in the middle-aged plantation is the lowest. This study could provide data support for the comprehensive evaluation of the effect of L. leucocephala on improving the soil ecological function in dry-hot valley.

     

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