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基于Meta-analysis的土壤氮素对采伐的响应研究

Response of Soil Nitrogen to Cutting Intensity Based on Meta-analysis

  • 摘要:
    目的 研究采伐影响下土壤氮素的变化规律,探究森林合理的采伐强度,维持森林资源的可持续性。
    方法 通过Review Manager 5.3软件,以标准化均数差(SMD)作为衡量效应尺度的统计学指标,对搜集到的1983-2017年初有关采伐对土壤氮素影响的31篇文献数据进行了Meta分析。
    结果 采伐可有效降低土壤全氮含量SMD=-0.55(95% CI,-1.04~-0.07) < 0,显著增加土壤铵态氮和硝态氮含量SMD=0.99(95% CI,0.51~1.47)>0;SMD=2.34(95% CI,0.49~4.19)>0,而对土壤水解性氮含量影响不明显SMD=-0.30(95% CI,-1.06~0.47)。土壤氮素变化因采伐强度不同而异,皆伐对其影响较大。
    结论 森林采伐时,在相同林型研究成果的基础上,合理控制采伐强度,减少高强度择伐,积极推广低强度择伐,避免皆伐。

     

    Abstract:
    Objective To investigate the rational cutting intensity and maintain forest resource sustainability by studying the soil nitrogen change after cutting.
    Method Standard mean difference (SMD) was applied as a statistical index to measure the effect scale using Review Manager 5.3. The papers published during 1983 to early 2017 were used to study the effects of cutting on soil nitrogen by meta analysis.
    Result Cutting effectively decreased soil total nitrogen contentSMD=-0.55 (95% confidence interval (CI), -1.04——0.07) < 0, and increased soil NH4+-N and NO3--N content significantlySMD=0.99 (95% CI, 0.51-1.47) >0; SMD=2.34 (95% CI, 0.49-4.19) >0, but had no significant effect on soil alkaline hydrolysis nitrogen contentSMD=-0.30 (95% CI, -1.06-0.47). The change of soil nitrogen varied with cutting intensity, and clear cutting had a greater effect on it.
    Conclusion The results of the study suggest that cutting intensity should be reasonably controlled, it is needed to reduce high-intensity selective cutting, promote low-intensity selective cutting and avoid clear cutting.

     

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