翅荚木人工林不同径阶间细根主要功能性状与根际土壤养分的关系  

Relationship between the main functional traits of fine root and the rhizosphere soil nutrients of different diameter classes in Zenia insignis plantation

作　　者：陈柳娟 钟全林[1,2,3] 李宝银 姚湘明 徐朝斌[2,3] 程栋梁[1,2,3] 郑跃芳[1] 余华[1,5] CHEN Liu-juan;ZHONG Quanlin;LI Bao-yin;YAO Xiang-ming;XU Chao-bin;CHENG Dong-liang;ZHENG Yue-fang;YU Hua(College of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;State Key Laboratory Breeding Base of Humid Subtropical Mountian Ecology,Fuzhou 350007,China;Fujian Province Key Laboratory of Plant Ecophysiology,Fujian Normal University,Fuzhou 350007,China;Shunchang County Forestry Science and Technology Center of Fujian Province,Shunchang 353200,Fujian,China;College of Oceanography,Minjiang University,Fuzhou 350108,China)

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [3]福建师范大学福建省植物生理生态重点实验室,福州350007 [4]福建省顺昌县林业科学技术中心,福建顺昌353200 [5]闽江学院海洋学院,福州350108

出　　处：《应用生态学报》2019年第11期3627-3634,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31971643);中央财政林业科技推广项目(2015-12);福建省科技厅重大项目(2019N5009);福建省杰出青年基金项目(2018J07003)资助~~

摘　　要：细根能敏感地感知土壤环境变化,对植物生长发育具有重要影响.以6年生翅荚木人工林为对象,对其不同径阶的细根主要功能性状与根际土壤养分特征及两者间关系进行分析.结果表明:细根生物量、根长密度与根体积密度均随径阶增加而增加,比根长与比根面积则随径阶增加呈先升高再下降后升高的趋势,根组织密度则与径阶大小不相关.不同径阶翅荚木根际土壤的pH值及含水率、全碳、全磷、铵态氮、硝态氮和总有效氮含量均存在显著差异,大径阶林木的根际土壤全碳、全氮、硝态氮、总有效氮含量相对较高,小径阶林木的根际土壤含水率、土壤全磷、铵态氮含量相对较高.土壤全氮、全碳、硝态氮和总有效氮含量与林木细根的生物量、根长密度、根体积密度呈显著正相关;土壤全磷与林木细根的根组织密度呈显著正相关,与比根长、比根面积呈显著负相关;土壤含水率与林木细根的生物量和根体积密度均呈显著正相关;根际土壤pH和林木细根的比根长、比根面积呈显著正相关,与根组织密度则呈显著负相关.研究结果可为翅荚木优良种质资源选育提供科学依据.Fine roots are sensitive to changes in the soil environment,and play an important role in plant growth and development.To clarify the relationship between fine root traits and rhizosphere soil nutrient characteristics,fine roots of trees belonging to different diameter classes in six-year-old Zenia insignis plantation were sampled.The results showed that root biomass,root length density and root volume density increased with the increases of diameter class.Specific root length and specific root area showed the trend of first rising and then falling and rising again with the increases of diameter class.Root tissue density did not change with diameter class.There were significant diffe-rences in soil pH,water content,total carbon,total phosphorus,ammonium nitrogen,nitrate nitrogen and total available nitrogen contents of rhizosphere soil belonging to different diameter classes.The concentrations of soil total carbon,total nitrogen,nitrate nitrogen and total available nitrogen in the rhizosphere soil of large diameter trees were relatively higher,while the soil water content,total phosphorus and ammonium nitrogen contents of small diameter trees were relatively higher.The concentrations of soil total nitrogen,total carbon,nitrate nitrogen and total available nitrogen were significantly positively correlated with root biomass,root length density and root volume density.The concentrations of soil total phosphorus was significantly positively correlated with root tissue density of fine roots,but negatively correlated with specific root length and specific root area.Soil water content was significantly positively correlated with root biomass and root volume density.Soil pH was significantly positively correlated with the specific root length and specific root area of fine roots,but negatively correlated with root tissue density.Our results provide scientific basis for the selection of excellent germplasm resources of Z.insignis.

关 键 词：细根功能性状 根际土壤 径阶 翅荚木人工林 

分 类 号：S51[农业科学—作物学]