摘要
为探明华北落叶松林土壤养分对林分密度的响应,筛选适宜的林分种植密度,以利于华北落叶松林的生长和幼苗更新。采用野外样地调查和室内试验相结合的方法,研究林分密度对华北落叶松林土壤养分含量和分布的影响。结果表明:除全磷外,土壤养分的分布都具有表聚现象;土壤有机质和碱解氮含量随土层深度增加呈先降低后升高的趋势,全磷含量随土层深度的增加呈升高趋势,全氮含量随土层深度增加呈降低趋势,速效磷含量在各土层之间变化不大,差异不显著。随着林分密度增大,土壤有机质、全氮和碱解氮含量基本呈先升高后降低的趋势;林分密度对土壤有机质含量的影响最大,与土壤有机质、全氮和碱解氮含量呈负相关关系,其中,与全氮含量相关关系显著(P<0.05),与全磷和速效磷含量呈正相关关系;当林分密度为125株·hm^(-2)时,土壤有机质、全氮和碱解氮含量在10~20 cm土层达到最大值,分别为28.20 g·kg^(-1)、1.45 g·kg^(-1)和143.27 mg·kg^(-1);当林分密度为500株·hm^(-2)时,全磷和速效磷含量在0~10 cm土层达到最大值,分别为0.73 g·kg^(-1)和16.07 mg·kg^(-1)。综合考虑土壤养分含量、土地的承载能力和枯落物的分解程度,建议将林分密度控制在125株·hm^(-2),该密度较适宜于研究区内华北落叶松的生长,更有利于幼苗更新。
An appropriate forest planting density was selected to facilitate the growth and seedling regeneration of Larix principis-rupprechtii forests and confirm the soil nutrient response of Larix principis-rupprechtii forests to stand density.The effects of stand density on the content of soil organic matter,total phosphorus,total nitrogen,available nitrogen,and available phosphorus in Larix principis-rupprechtii forests were studied through a combination of field surveys and laboratory experiments.Results show that,except for total phosphorus,the distribution of soil nutrients indicates a surface accumulation phenomenon.The organic matter content and available nitrogen first decrease and then increase with an increase in soil depth;the total phosphorus content increases with the soil depth.The total nitrogen content shows a decreasing trend with an increase in soil depth,and the content of available phosphorus does not change significantly between soil layers.As the forest density increases,the organic matter,total nitrogen,and available nitrogen first increase and then decrease.Forest density has the most significant impact on organic matter and is negatively correlated with soil organic matter,total nitrogen,and available nitrogen;its correlation with total nitrogen is significant(P<0.05),and it is positively correlated with total phosphorus and available phosphorus.When the stand density is 125 tree·hm^(-2),the content of organic matter,total nitrogen,and available nitrogen in the 10-20 cm soil layer reaches a maximum value at 28.20 g·kg^(-1),1.45 g·kg^(-1),and 143.27 mg·kg^(-1),respectively.When the stand density is 500 tree·hm^(-2),the total phosphorus and available phosphorus in the 0-10 cm soil layer reach their maximum values at 0.73 g·kg^(-1) and 16.07 mg·kg^(-1),respectively.Considering the soil nutrient content,the carrying capacity of the land,and the decomposition degree of litter,controlling the forest density at 125 tree·hm^(-2),which is more suitable for the growth of Larix principis-rupprechti
作者
卜瑞瑛
梁文俊
魏曦
卫舒平
肖韦江
BU Ruiying;LIANG Wenjun;WEI Xi;WEI Shuping;XIAO Weijiang(College of Forestry,Shanxi Agriculture University,Taigu,Shanxi 030801,China)
出处
《森林与环境学报》
CSCD
北大核心
2021年第2期140-147,共8页
Journal of Forest and Environment
基金
国家自然科学基金项目(31971644
31901365
31500523)。
关键词
华北落叶松林
林分密度
土壤
养分含量
Larix principis-rupprechtii forest
stand density
soil
nutrient content
