福建海岸沙地5种防护林土壤微生物群落特征  

Soil Microbial Communities in Different Protection Forest Types in Coastal Sand Dunes of Fujian Province

作　　者：高伟 叶功富[2] 岳新建[3] 刘海 黄志群 Gao Wei;Ye Gongfu;Yue Xinjian;Liu Hai;Huang Zhiqun(Institute of Forest Ecology and Carbon Sequestration Measurement,Fujian Forestry Vocational and Technical Collage,Nanping,Fujian 353011,China;Fujian Academy of Forestry,Fuzhou 350012,China;Forest Inventory and Planning Institute of Fujian Province,Fuzhou 350003,China;Institute of Geography,Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]福建林业职业技术学院森林生态与碳汇计量研究所,福建南平353011 [2]福建省林业科学研究院,福州350012 [3]福建省林业调查规划院,福州350001 [4]福建师范大学地理研究所,福州350007

出　　处：《水土保持研究》2024年第3期204-212,共9页Research of Soil and Water Conservation

基　　金：福建省林业科学研究项目(2023FKJ31);福建省科技计划项目(2021L3017)。

摘　　要：[目的]探明福建海岸沙地不同防护林对土壤微生物群落的影响及机制,为海岸带防护林森林质量提升提供科学依据。[方法]选择5种主要防护林为对象,分别为次生林、木麻黄(Casuarina equisetifolia)人工林、湿地松(Pinus elliottii)人工林、厚荚相思(Acacia crassicarpa)人工林和尾巨桉(Eucalyptus urophylla×E.grandis)人工林,采用磷脂脂肪酸法(Phospholipids fatty acid, PLFA)比较了不同防护林的土壤微生物群落结构。[结果](1)海岸沙地不同防护林土壤中共检测到18种PLFA生物标记,在尾巨桉和次生林中种类最多,湿地松和厚荚相思人工林最少。(2)土壤总磷脂脂肪酸、革兰氏阳性细菌和革兰氏阴性细菌含量均表现为尾巨桉和次生林较高,厚荚相思和木麻黄人工林较低,土壤真菌含量为尾巨桉林最高,丛枝菌根菌含量为次生林最高,真菌和丛枝菌根菌含量在其他防护林间无显著差异。(3)次生林的土壤微生物多样性和均匀度均高于4种人工林。(4)土壤pH、细根碳氮含量为土壤微生物群落的主要影响因子,其次为土壤全氮和硝态氮含量以及凋落物木质素/氮和细根碳氮比。[结论]不同防护林对土壤微生物群落的影响存在显著差异,在海岸带木麻黄防护林中引种尾巨桉和乡土树种,可以增加土壤微生物多样性,提高森林生态功能。[Objective]The aims of this study are to understand the soil microbial communities in different protection forests in coastal sand dune ecosystem,and to provide theoretical basis for sustainable management of the protection forests.[Methods]A study was conducted to compare the effects of different forests on soil microbial composition and the relationship between soil microorganism and environmental factors by phospholipid fatty acid method(PLFA)in 5 forests including secondary forest,and plantations of Casuarina equisetifolia,Pinus elliottii,Acacia crassicarpa and Eucalyptus urophylla×E.grandis.[Results](1)18 kinds of PLFA biomarkers were detected in the soils of different protection forests in coastal sand dune ecosystem,which were most in Eucalyptus urophylla×E.grandis plantation and secondary forest,and least in Pinus elliottii and Acacia crassicarpa plantations.(2)The contents of total PLFA,gram-positive bacteria and gram-negative bacteria were all higher in Eucalyptus urophylla×E.grandis plantation and secondary forest,and lower in Acacia crassicarpa and Casuarina equisetifolia plantations.In addition,the fungi content was significantly higher in Eucalyptus urophylla×E.grandis plantation than in other forest types,the content of soil fungi in Eucalyptus urophylla×E.grandis plantation was the highest,and that of arbuscular mycorrhizal in secondary forest was the highest,no significant difference was found among other protection forests.(3)The soil microbial diversity and evenness of the secondary forest were higher than those of the four plantations.(4)The soil pH,fine root carbon and nitrogen contents had the greatest impact on soil microbial community,followed by soil total nitrogen and nitrate nitrogen contents,litter lignin/nitrogen and fine root carbon nitrogen ratio.[Conclusion]The effects of protection forests on soil microbial community are significantly different.The introduction of Eucalyptus urophylla×E.grandis and native trees in the coastal Casuarina equisetifolia protection forest can inc

关 键 词：海岸沙地 防护林 土壤微生物群落 磷脂脂肪酸 亚热带 

分 类 号：S154.3[农业科学—土壤学] S714.3[农业科学—农业基础科学]