为了解典型人工林下凋落物层跳虫群落结构特征，于2013年5月、7月、9月和11月中旬对四川盆周西缘山地的楠木Phoebe zhennan人工林、水杉Metasequoia glyptosyroboides人工林、柳杉Cryptomeria fortunei人工林和次生林4种林型下凋落物层跳虫群落结构进行调查。结果表明：试验共捕获跳虫1496头，隶属于11科。各林型凋落物层跳虫个体密度与类群数具有相似的变化趋势，其中，跳虫个体数和类群数均以柳杉林最高，分别为768头和11科，以次生林最低，分别为86头和6科。各林型均以长角蚍兆科Entomobryidae，等节蚍兆科Isotomidae和圆蚍兆科Sminthuridae为优势类群，其个体数所占比例均在82%以上。研究显示，各林型凋落物层跳虫密度和类群数并不与凋落物蓄积量一致，说明凋落物蓄积量对跳虫密度及类群数没有决定性的影响；相似性分析显示，除柳杉和楠木相似性系数在7月达最高外，不同林分间相似性系数最高值均出现在9月，最小值分别出现在5月和7月。图3表5参20%To determine the characteristics of the Collembola community in the litter layer of typical artificial plantations, Cryptomeria fortunei, Phoebe zhennan, Metasequoia glyptostroboides, and a secondary-forest were selected and studied in May, July, September, and November of 2013. Analysis included a similarity index. Results comprised a total collection of 1 496 samples of soil fauna belonging to 11 families. Of these, 290 be-longing to 9 families were found in M. glyptostroboides stands, 352 belonging to 7 families were collected in Phoebe zhennan plots, 768 belonging to 11 families were collected in C. fortunei stands, and 86 belonging to 6 families were collected in the secondary-forest. The highest number of Collembola for each month was found in C. fortunei, and the lowest number (except for May) was found in the secondary-forest. In each forest type, Isotomidae, Sminthuridae, and Entomobryidae were the dominant families. No direct relation between the indi-vidual number and families of Collembola and litter accumulation were found. Also, the similarity index studies showed that the highest value was found in September (excepting July) , and the smallest values were found in May and July.
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