中文摘要：

为揭示去除林下凋落物和草本层（简称除凋和除草）对楠木Phoebe zhennan人工林土壤动物群落结构的影响,以四川盆周西缘山地60年生楠木人工林为研究对象,人工去除凋落物和草本层（RL）的方法,以未处理样地（ck）为对照,采用大型手捡和干、湿漏斗分离法,分别在样地处理后1个月（RL1）和3个月（RL3）时对0~5 cm,5~10 cm,10~15 cm土层的土壤动物群落结构进行调查。结果显示：实验共采集土壤动物1 753头,分属4门13纲32目99科,除凋除草降低了土壤动物密度和类群数。其中：（1）与对照样地ck1相比,样地RL1类群数极显著降低（P〈0.01）,多样性指数、均匀度指数和优势度指数下降不显著（P〉0.05）,丰富度指数（D）和密度类群指数（DG）极显著降低（P〈0.01）。（2）与对照样地ck3相比,样地RL3土壤动物密度和类群数极显著低于对照（P〈0.01）,土壤动物类群数极显著低于对照（P〈0.01）,多样性指数、均匀度指数和优势度指数下降不显著（P〉0.05）,丰富度指数（D）和密度类群指数（DG）显著降低（P〈0.05）。林下除凋除草会导致土壤动物平均密度、类群数以及多样性指数的降低,进而影响整个森林生态系统功能的发挥。

英文摘要：

As a main component of soil ecosystems,soil fauna play an important role in the process of soil element cycling,transformation,and migration;however,soil fauna diversity is closely related to ground cover which has a tremendous impact on soil moisture and temperature.To reveal responses of the soil fauna community to the loss of the litter and herb layers,soil fauna in a Phoebe zhennan plantation on the western Sichuan Basin border were studied after litter and herb layers were removed.In each sampled area,soil animals were collected by hand,recorded,and put into a container with alcohol.Then they were transported to a laboratory for detailed classification and identification.The meso-and microfauna samples were gleaned by the steel core and stored in special soil fauna sealing bags.Next,all samples were transported to a laboratory within 12 h and were subsequently separated by both the Tullgren and Baermann methods over 48 h.Mesofauna were observed by microscope after 4 h to avoid autolysis of Enchytraeidae.All collected soil fauna were counted and classified under a light microscope and were identified according to the reference of ＂Pictorial keys to the soil animals of China＂.The experiments conducted in July and September,based on statistical analytical software SPSS and Excel,a density-group index（DG） was made.Results showed a collection of 4 phyla from 13 classes with 32 orders having 99 families comprising a total of 1 753 individual soil fauna.Also,after removal of the litter and herb layers,decreases in the soil fauna groups from the two experiments and the DGindex in July were highly significant（P〈0.01）.After a monthwith the liter and herb removals,compared with Control sites,the soil fauna average density decrease significantly（P〈0.01）.Thus,the soil fauna community was deeply influenced by loss of the litter and herb layers,which revealed the relations between the underground biodiversity and the plant species.