汕尾市城区山杜英人工林生物量及林下土壤理化性质

Study on Biomass and Physical and Chemical Properties of under Forest Soil of Elaeocarpus sylvestris Artificial Forest in the Urban Area of Shanwei City

【目的】探讨山杜英人工林生物量和林下土壤理化性质,为山杜英人工林高质量发展和生态服务功能持续稳定发挥提供理论支撑。【方法】选取汕尾市城区市郊种植的山杜英人工林为试验对象。试验地山杜英人工林于2010年左右人工种植,树龄约为14 a,采用相对生长法,以胸径为变量与乔木各器官结合,建立标准木树干树枝树叶树根四种器官生物量的异速生长模型,通过换算干重比的方法估算生物量并加以比较;检测山杜英人工林土壤理化性质。【结果】山杜英树干、树枝、树叶、树根的占比分别为50.83%、28.24%、3.58%、17.35%,山杜英乔木层生物量为26.56 t·hm^(-2);总森林生物量为34.18 t·hm^(-2);试验地土壤呈弱酸性,有机质、全氮、碱解氮、有效磷含量为中等水平。【结论】运用了标准木法,并借助幂函数拟合计算,成功构建了山杜英人工林的森林生物量模型。该模型不仅适用于测定山杜英林木的干、枝、叶、根四种器官的生物量,而且其方法的有效性得到了充分验证。速效钾含量缺乏,速效钾可能是影响山杜英人工林生长的限制性因素,土壤养分调整分析利于生态系统不同层面的相互作用机理。

【Objective】To explore the biomass of Elaeocarpus sylvestris artificial forests and the physical and chemical properties of understory soil,in order to provide theoretical support for the high-quality development and sustainable and stable ecological service functions of Elaeocarpus sylvestris artificial forests.【Method】The artificial forest of Elaeocarpus sylvestris planted in the suburbs of Shanwei was selected as the experimental object.The experimental site of Elaeocarpus sylvestris artificial forest was planted around 2010,with a tree age of about 14 years.The relative growth method was used to combine the diameter at breast height as a variable with various organs of the tree to establish an allometric growth model for the biomass of the four organs of the standard tree trunk,branches,leaves,and roots.The biomass was estimated and compared by converting the dry weight ratio.Test the physical and chemical properties of soil in artificial forests of Elaeocarpus sylvestris.【Result】The proportions of trunk,branch,leaf,and root of Elaeocarpus sylvestris were 50.83%,28.24%,3.58%,and 17.35%,respectively.The biomass of the Elaeocarpus sylvestris tree layer was 26.56 t·hm^(-2).The total forest biomass is 34.18 t·hm^(-2).The soil in the experimental site is weakly acidic,with moderate levels of organic matter,total nitrogen,alkali hydrolyzed nitrogen,and available phosphorus.【Conclusion】The forest biomass model of Elaeocarpus sylvestris artificial forest was successfully constructed using the standard wood method and power function fitting calculation.This model is not only applicable for measuring the biomass of the four organs of the stem,branches,leaves,and roots of Elaeocarpus sylvestris,but its effectiveness has been fully validated.The lack of available potassium content may be a limiting factor affecting the growth of Elaeocarpus sylvestris artificial forests,and soil nutrient adjustment analysis is beneficial for understanding the interaction mechanisms at different levels of the ecosystem.