广西猫儿山水青冈林土壤剖面有机碳垂直分布特征及影响因素  

Vertical distribution of soil organic carbon and its influence factors of Fagus longipetiolata forest in Mao'ermountain, Guangxi

作　　者：王会利[1] 王绍能 宋贤冲[1] 秦丽玲 唐林峰 叶建平 曹继钊[1] 邓小军[1] WANG Huili;WANG Shaoneng;SONG Xianchong;QIN Liling;TANG Linfeng;YE Jianping;CAO Jizhao;DENG Xiaojun(Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning 530002,Guangxi,China;Bureau of Guangxi Mao’erMountain Nature Reserve,Guilin 541316,Guangxi,China;Forestry Technology Popularization Station of Guilin City,Guilin 541001,Guangxi,China)

机构地区：[1]广西壮族自治区林业科学研究院,广西南宁530002 [2]广西桂林猫儿山国家级自然保护管理局,广西桂林541316 [3]桂林市林业技术推广站,广西桂林541001

出　　处：《中南林业科技大学学报》2018年第11期89-94,122,共7页Journal of Central South University of Forestry & Technology

基　　金：广西自然科学基金项目(2016GXNSFBA380051);桂林市林业局和广西桂林猫儿山国家自然保护管理局项目"广西猫儿山青冈天然林水源涵养和水土保持监测与评价";广西林科院基金(林科201616号)

摘　　要：通过分层采集水青冈林0～100 cm土壤剖面样品,测定不同土层有机碳含量,分析其垂直分布特征,并通过相关分析探讨土壤容重、总孔隙度、机械组成等物理性质及土壤pH值、速效养分等化学性质对土壤有机碳的影响。结果表明:水青冈林地不同土层土壤有机碳含量和有机碳密度变化范围分别为28.66～76.75 g/kg和5.52～10.77 kg/m2,且均表现出随土层深度的增加大致呈逐渐降低的变化趋势,其中0～20 cm土层有机碳总含量和有机碳密度最大,分别占据整个土壤剖面的33.82%和27.94%,具有明显的表聚性;水青冈林地土壤容重和总孔隙度的变化范围分别为0.71～1.05 g/cm3和54.58%～73.16%,0～20 cm土层其值与其他土层差异显著;水青冈林地各级粒径土壤颗粒含量从大到小的排列顺序为砂粒(53.51%)>粉粒(29.93%)>粘粒(16.56%),土壤质地为砂质壤土;水青冈林地不同土层土壤p H值的平均值为4.16,且土层之间变幅很小;速效氮、速效磷和速效钾养分平均含量分别为309.48 mg/kg、1.61 mg/kg和40.81 mg/kg,其随土层深度的变化趋势与土壤有机碳含量和有机碳密度相似;相关分析结果表明,土壤有机碳含量和有机碳密度均与p H值、粘粒(<0.002 mm)呈显著负相关,与土壤总孔隙度、速效氮、速效磷和速效钾呈显著正相关;pH值、粘粒含量、总孔隙度、速效氮、速效磷、速效钾与有机碳关系密切,可以用于预测土壤有机碳的变化。Soil samples of 0-100 cm profile depth were sampled in Fagus longipetiolata forest.Soil organic carbon content was measured,and its vertical distribution was studied.Correlation analysis was conducted to studyrelationship between soil organic carbon and soil physical properties such as soil bulk density,total porosity percentage,mechanical composition,soil chemical properties such as pH,soil available nutrition content.The results showed that:soil organic carbon contentand density of every layerin Fagus longipetiolata forest ranged from 28.66 g/kg to 76.75 g/kg and 5.52 kg/m2 to 10.77 kg/m2,respectively,and they showed decreasingwith the increase of soil depth.The percentage of soil organic carbon content and density of 0-20 cm layer to the wholesoil profiles were the largest(33.82%,27.94%),were characterized by surface gathering.Soil bulk density and total porosity percentage of every layerin Fagus longipetiolata forest ranged from 0.71 g/cm3 to 1.05 g/cm3 and 54.58%to 73.16%,respectively,and both of themin 0-20 cm layer were significantly different from other soil layers.Soil particle-size composition in Fagus longipetiolata forestwere asfollows:Sand(53.51%)>Silt(29.93%)>Clay(16.56%),and the soil texture belongs to sandy loam soil in this region.pH value in Fagus longipetiolata forest was 4.16 averagely,and they didn’t change significantly among soil layers.The mean available N,P and K were 309.48 mg/kg,1.61 mg/kg and 40.81 mg/kg,respectively,these indexes also showed the same trend with soil organic carbon content and density.According to correlation analysis,soil organic carbon content and density were negatively correlated with soil pH and Clay(<0.002 mm),but positively correlated with total porosity percentage,available N,P and K.pH,Clay,total porosity percentage,available N,P and K were closely related with soil organic carbon,and could be used to predict the change of soil organic carbon.

关 键 词：水青冈 土壤有机碳 垂直分布 影响因素 

分 类 号：S792.16[农业科学—林木遗传育种] S153.6[农业科学—林学]