中亚热带几种针、阔叶树种凋落物混合分解对土壤微生物群落碳代谢多样性的影响  

The decomposition of coniferous and broadleaf mixed litters significantly changes the carbon metabolism diversity of soil microbial communities in subtropical area,southern China

作　　者：陈法霖[1] 郑华[1] 阳柏苏[2] 欧阳志云[1] 张凯[1] 肖燚[1] 屠乃美[3] 

机构地区：[1]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [2]湖南第一师范学院,长沙410205 [3]湖南农业大学,长沙410128

出　　处：《生态学报》2011年第11期3027-3035,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(3060047440871130);湖南省自然科学基金项目(07jj3082)

摘　　要：通过小盆模拟试验,用BIOLOG微平板培养的方法研究了南方红壤丘陵区典型物种马尾松和湿地松的凋落物分别与白栎和青冈的凋落物混合,与单一针叶凋落物分解时相比,针阔混合凋落物分解过程中土壤微生物群落功能多样性的差异。结果表明:(1)针叶和阔叶混合分解提高了土壤微生物群落碳代谢的强度、丰富度以及多样性,针阔混合凋落物分解时土壤微生物群落的碳源代谢方式与单一针叶分解时差异显著;(2)凋落物分解前期土壤微生物群落碳代谢强度、丰富度和多样性与凋落物初始C/N呈显著负相关,分解后期土壤微生物群落碳代谢强度与凋落物初始木质素/N比呈显著负相关,碳代谢多样性与初始P含量呈显著正相关;(3)通过改变凋落物物种组成,进而改变凋落物元素组成(C/N、木质素/N和P),能显著影响土壤微生物群落的碳代谢强度和代谢多样性。在南方红壤丘陵区,针-阔叶混合的凋落物比单一针叶凋落物更有利于提高土壤微生物群落的功能。Litters are the important component of forest ecosystem and play a key role in plant growth and ecosystem nutrient cycle. Soil microbial communities, as one of the driving factors of forest litter decomposition, can significantly influenced by composition of litters. To understand the responses of carbon metabolism diversity of soil microbial communities to the leaf litter composition plays a key role in the sustainable management of plantations. We designed a simulation experiment with flowerpots at the Ecological Benefit Monitoring Station of the Yangtze River Protection Forest, which is located in Hengyang County of southern Hunan Province, to determine the impacts of litter composition on carbon metabolism diversity of soil microbial communities. The litters of masson pine （ Pinus massoniana）, slash pine （ Pinus elliottii）, white oak （ Quercus fabri） and blue Japanese oak （ Cyclobalanopsis glauca ） , which are all the typical species of the southern China, were chosen as study species. With the BIOLOG method, the carbon metabolism diversity of soil microbial communities were studied during the decomposition of different leaf litters, including two single coniferous leaf litter treatments （ masson pine and slash pine） and four coniferous and broadleaf mixed litter treatments （masson pine ＋ white oak, masson pine ＋ blue Japanese oak, slash pine＋ white oak and slash pine＋ blue Japanese oak）. The results showed that： （1） the decomposition of coniferous and broadleaf mixed litter increased the carbon metabolic intensity, richness and diversity of soil microbialcommunities in comparison with the decomposition of single coniferous leaf litter. Soil microbial communities under the coniferous and broadleaf mixed litters had significantly different carbon metabolic patterns in comparison with those of the single coniferous leaf litter treatment. In comparison with those of single coniferous leaf litter treatment, soil microbial communities under the coniferous and broadleaf mixed l

关 键 词：森林凋落物 土壤微生物群落 功能多样性 BIOLOG 

分 类 号：S714[农业科学—林学]