森林土壤动物对凋落物早期分解及养分释放的影响  

Effects of forest soil fauna on early-stage litter decomposition and nutrient release

作　　者：崔洋[1,2,3] 汪思龙[1,2] 于小军 颜绍馗[1,2] 

机构地区：[1]中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室,沈阳110164 [2]湖南会同森林生态系统国家野外科学观测研究站,湖南会同418307 [3]中国科学院研究生院,北京100049

出　　处：《生态学杂志》2012年第11期2709-2715,共7页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2011CB403203)资助

摘　　要：采用野外缩微实验方法,研究了会同林区常绿阔叶林和杉木人工林土壤动物对凋落物早期分解的影响。结果表明:孔径为2mm的网筒内试验土壤和凋落物中大型土壤动物的类群数和多度均明显少于孔径为4mm的网筒;排除大型土壤动物后,常绿阔叶林中凋落物C、K、Ca、Mg养分浓度显著增加,杉木林中凋落物Mg浓度显著增加,2个样地中的凋落物失重率以及凋落物C、P、Ca、Mg等养分元素的释放率均极显著降低(P<0.01);大型土壤动物对不同元素释放率的影响不同,2个样地中对凋落物Ca、Mg元素释放率的影响均较大,杉木人工林中对N和K释放率的影响较小,常绿阔叶林中对P释放率的影响最小。A field microcosm experiment was conducted to study the effects of soil fauna on the early-stage litter decomposition in an evergreen broadleaf forest and a Cunninghamia lanceolata plantation in Huitong of Hunan,South-central China.The taxonomic diversity and abundance of soil macrofauna in the litters and soils were obviously lower in 2 mm mesh nylon net than in 4 mm mesh nylon net.After the exclusion of soil macrofauna,the C,P,Ca,and Mg concentrations in the litters in evergreen broadleaf forest and the Mg concentration in the litters in C.lanceolata plantation increased significantly,while both the mass loss rate and the nutrient release rates of the litters decreased significantly.Soil macrofauna had different effects on the release rates of different nutrients in the litters,with larger effects on the release rates of the litter Ca and Mg in evergreen broadleaf forest and C.lanceolata plantation,lesser effects on the release rates of N and K in C.lanceolata plantation,and least effects on the release rate of P in evergreen broadleaf forest.

关 键 词：凋落物分解 土壤动物 养分浓度 杉木 

分 类 号：S714.3[农业科学—林学]