广西雅长4种生态公益林土壤肥力状况  

The Soil Fertility Status of Four Ecological Public Welfare Forests in Yachang,Guangxi

作　　者：张健本 祝鑫宇 黄华[1] 蒋超尤 李梦莉 蒙凤群 Zhang Jianben;Zhu Xinyu;Huang Hua;Jiang Chaoyou;Li Mengli;Meng Fengqun(Guangxi University,Nanning 530004,P.R.China)

机构地区：[1]广西大学,南宁530004

出　　处：《东北林业大学学报》2024年第11期125-131,共7页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(32201431);广西科技基地和人才专项(桂科AD21220155);广西自然科学基金项目(2023GXNSFBA026213)。

摘　　要：为了揭示桉树、马尾松人工公益林土壤肥力状况,以广西雅长兰科植物自然保护区4种生态公益林(桉树、马尾松人工公益林、土山天然林、喀斯特天然林)土壤为研究对象,测定不同公益林土壤指标,分析不同林型之间林分特征、土壤立地条件、土壤养分、凋落物养分的差异,以及各驱动因子与土壤养分之间的相关性,并计算各土壤养分综合指数。通过不同公益林土壤养分的对比分析,揭示影响桉树、马尾松人工公益林土壤肥力的因素(林分特征、土壤立地条件和凋落物输入)。结果表明:人工林土壤全碳、全氮、全磷、速效钾和速效钙质量分数均低于地带性天然林;人工林速效磷质量分数低于土山天然林而高于喀斯特天然林;人工林速效镁质量分数与地带性天然林无显著差别。人工林土壤肥力显著低于地带性天然林。林分郁闭度低、土壤酸化、凋落物养分输入减少是导致桉树、马尾松人工公益林土壤肥力下降的核心驱动因子。对桉树、马尾松人工公益林适当增加人为干扰(定期施用石灰石中和土壤酸性、与本土阔叶树种混交)可以改善凋落物养分输入,维持人工公益林土壤养分的平衡。In order to reveal the soil fertility status of Eucalyptus and Pinus massoniana artificial ecological public welfare forests,the soils of four ecological public welfare forests(Eucalyptus and P.massoniana artificial public welfare forests,Non-karst natural forest,and Karst natural forest)in Yachang Orchid Plant Natural Reserve in Guangxi were selected as the research objects.Different soil indicators of public welfare forests were measured to analyze the differences in stand characteristics,soil site conditions,soil nutrients,and litter nutrients among different forest types,as well as the correlation between various driving factors and soil nutrients,and the calculation of comprehensive soil nutrient indexes.Through comparative analysis of soil nutrients in different public welfare forests,the factors influencing soil fertility of Eucalyptus and P.massoniana artificial public welfare forests(stand characteristics,soil site conditions,and litter input)were revealed.The results showed that the contents of total carbon,total nitrogen,total phosphorus,available potassium,and available calcium in the soil of artificial forests were lower than those in zonal natural forests.The content of available phosphorus in plantations was lower than that in Non-karst natural forests but higher than that in Karst natural forests.There was no significant difference in the content of available magnesium between plantations and zonal natural forests.The soil fertility of the plantations was significantly lower than that of zonal natural forests.Low forest canopy closure,soil acidification,and reduced litter nutrient input were identified as the core driving factors leading to the decrease in soil fertility of Eucalyptus and P.massoniana artificial public welfare forests.Proper artificial disturbance(regular application of limestone to neutralize soil acidity,and mixed planting with native broad-leaved species)Eucalyptus and P.massoniana artificial public welfare forests can improve litter nutrient inputs,and maintain the balance of

关 键 词：生态公益林 人工林 天然林 土壤养分 

分 类 号：S714.8[农业科学—林学]