晋南不同密度油松人工林土壤水分的物理特性  

Soil Hydro-physical Properties in Pinus tabuliformis Plantations with Different Stand Densities in Southern Shanxi

作　　者：杜满义[1] 封焕英[2] 裴顺祥[2] 张连金[2] 法蕾[2] 郭嘉[2] 辛学兵[1] Du Manyi;Feng Huanying;Pei Shunxiang;Zhang Lianjin;Fa Lei;Guo Jia;Xin Xuebing(Experimental Centre of Forestry in North China,Chinese Academic of Forestry,Beijing 102300,P.R.China)

机构地区：[1]中国林业科学研究院华北林业实验中心、北京九龙山暖温带森林国家长期科研基地,北京102300 [2]中国林业科学研究院华北林业实验中心,北京102300

出　　处：《东北林业大学学报》2021年第9期72-76,共5页Journal of Northeast Forestry University

基　　金：国家重点研发计划项目(2016YFD060020304)。

摘　　要：为应对人工林生态系统的经营问题,探究林分密度对森林土壤的影响,以晋南油松人工纯林为研究对象,采用典型抽样法,探讨3种林分密度(500、1250、2475株·hm^(-2))对土壤水分物理特性的影响。结果表明:(1)不同林分密度对土壤密度和土壤孔隙度影响不同,高密度油松人工林显著降低土壤密度,增加土壤总空隙度和非毛管孔隙。(2)不同林分密度对土壤持水特性的影响程度不同,高密度油松人工林显著增加土壤最大持水量和田间持水量。(3)不同林分密度对表层土壤密度、孔隙度和持水特性的影响更为强烈,林分密度对0<h≤10 cm表层土壤的土壤密度、孔隙度和持水特性影响超过10 cm<h≤20 cm和20 cm<h≤40 cm土层次的土壤。(4)林分密度不改变土壤属性垂直分异的基本规律,随土层深度的增加,不同密度林分土壤密度不断增大,总孔隙度、毛管孔隙度、非毛管孔隙度,最大持水量、毛管持水量和田间持水量等均不断减小,土壤密度与土壤孔隙度和土壤持水特性指标表现出相反的增减趋势。(5)林分密度2500株·hm^(-2)左右相对更利于晋南区域油松人工林的可持续健康发展。To cope with the management problem of plantation forest and explore the responses of soil physical properties to varied stand densities,we used a typical sampling method to study the effects of three different stand densities(500,1250 and 2475 trees·hm^(-2))on soil hydro-physical properties in P.tabuliformis pure forests in South Shanxi.Different stand densities could influence soil bulk density and soil porosity,with the lower bulk density as well as higher total soil porosity and non-capillary porosity in the higher-density plantation.Moreover,different stand densities could regulate soil water retention capacity,with the high-density plantation having the higher maximum water-holding capacity and field capacity.In addition,different stand densities could exert more effects on the physical properties of topsoil(0<h≤10 cm)than that of other soil layers(10 cm<h≤20 cm and 20 cm<h≤40 cm),and had no significant effects on the vertical patterns of soil properties.With the increase of soil depth,the soil bulk density of different stand density increased,however,the total porosity,capillary porosity,non-capillary porosity,maximum water-holding capacity,capillary moisture capacity,and field capacity were reduced.Soil bulk density,soil porosity,and soil water-holding characteristics showed a decline trend withincreasing soil bulk density.The stand density of 2500 trees·hm^(-2) could be beneficial to the sustainable and healthy development of the P.tabuliformis plantation.

关 键 词：油松 林分密度 土壤密度 土壤孔隙度 土壤持水特性 

分 类 号：S750[农业科学—森林经理学]