不同林分密度油松天然林土壤理化性质及微生物量碳氮特征研究  

Research on the Characteristics of Soil physicochemical Properties and Microbial Biomass Carbon and Nitrogen in Natural Pinus tabulaeformis Forests with Different Stand Densities

作　　者：董威 刘泰瑞 覃志杰 郭晋平 张芸香[1] DONG Wei1;LIU Tairui1;TAN Zhijie1;GUO Jinping;ZHANG Yunxiang(College of Forestry, Shanxi Agricultural University, Taigu 030801, China; Graduate School of Shanxi Agricultural University, Taigu 030801, China)

机构地区：[1]山西农业大学林学院,山西太谷030801 [2]山西农业大学研究生院,山西太谷030801

出　　处：《生态环境学报》2019年第1期65-72,共8页Ecology and Environmental Sciences

基　　金：山西省重点研发计划专项(2018LYCX32)

摘　　要：为应对天然林退化和天然林生态系统的经营问题,探究以林分密度为调节因子的森林土壤响应,在关帝山林区油松(Pinus tabulaeformis)天然林区开展探索研究,通过样地调查及土壤采样分析,对不同林分密度(725-1 375 plant·hm^(-2))森林土壤理化性质及微生物碳氮特征规律进行分析研究,探明土壤属性对林分密度变化的响应机制,为森林质量精准提升及森林生态系统可持续经营提供理论依据。结果表明,(1)林分密度的变化间接影响土壤含水量(18.27%-34.27%)、容重(0.87-1.10 g·cm^(-3))、pH(6.86-7.13),总碳(15.26-29.44 g·kg^(-1))、全氮(0.92-2.14 g·kg^(-1))、全磷(0.20-0.30 g·kg^(-1))、微生物量碳(760.56-1 808.73mg·kg^(-1))、微生物量氮含量(134.84-257.59mg·kg^(-1)),除容重、pH值、全磷含量外,其他指标现随密度变化均呈先增后减的变化规律。(2)土壤属性指标垂直分布规律:土壤含水量、总碳、全氮、全磷、微生物量碳、微生物量氮含量随土层深度增加而下降,土壤容重和pH值却呈相反趋势;林分密度不改变总体格局,但随林分密度的变化,土壤垂直分异程度在中密度林分中(975-1 175 plant·hm^(-2))最小,更为均一稳定。(3)当油松天然林林分密度适中时,0-30cm深度的土壤水分、总碳、全氮、全磷、微生物量碳、微生物量氮含量保持在较高水平。综上,认为研究地区油松天然林适宜的保留密度为975-1 175 plant·hm^(-2)。To cope with degeneration of natural forests and management problems of natural forest ecological system and explore forest soil response with stand density as regulatory factor,an exploratory research was carried out in natural Pinus tabulaeformis forests in Guandi Mountain Forest Region.Through sample area investigation and soil sampling analysis,soil physicochemical properties and microbial biomass carbon and nitrogen in natural forests with different stand densities(725-1 375 plant·hm^-2)were analyzed,so as to explore the response mechanism of soil properties to stand density changes,and to provide theoretical basis for the precise improvement of forest quality and sustainable development of forest ecological system.The results showed that:(1)The change in stand density indirectly influenced the water content(18.27%-34.27%),bulk density(0.87-1.10 g·cm^-3),pH(6.86-7.13),total carbon(15.26-29.44 g·kg^-1),total nitrogen(0.92-2.14 g·kg^-1),total phosphorus(0.20-0.30 g·kg^-1),microbial biomass carbon(760.56-1 808.73 mg·kg^-1)and microbial biomass nitrogen(134.84-257.59 mg·kg^-1)in soil;except bulk density,pH and total phosphorus,other indexes presented a changing rule of increasing firstly and then decreasing along with density variation.(2)The vertical distribution law of soil property indexes was that the water content,total carbon,total nitrogen,total phosphorus,microbial biomass carbon and microbial biomass nitrogen in soil decreased with the increase of soil depth,while soil bulk density and pH value showed an opposite trend.The stand density did not change the overall layout,when the stand density wasmoderate(975-1 175 plant·hm^-2),the degree of vertical soil differentiation was minimal,which was more uniform and stable.And(3)when the stand density of natural Pinus tabulaeformis forest was moderate,the water content,total carbon,total nitrogen,total phosphorus,microbial biomass carbon and microbial biomass nitrogen in soil at a depth of 0-30 cm remained relatively high.Sum up,the suitable density of

关 键 词：油松天然林 林分密度 土壤理化性质 土壤微生物量碳氮 

分 类 号：S718.5[农业科学—林学] X171.1[环境科学与工程—环境科学]