title: [Distribution pattern of meso-micro soil fauna in Eucalyptus grandis plantation].
abstract: In this paper, meso-micro soil fauna were extracted and collected by Baermann's and Tullgren' s method, and their distribution pattern in the Eucalyptus grandis plantation of Hongya County, Sichuan Province was studied. A total of 13 550 specimens were collected, belonging to 6 phyla, 13 classes, and 26 orders. Acarina, Nematoda, Collembola were the dominant groups, and Enchytraeidae was the frequent one. The group and individual numbers of meso-micro soil fauna varied with seasons, being the maximum in autumn or winter, fewer in summer, and the minimum in spring. The density of meso-micro soil fauna in soil profile decreased rapidly with increasing soil depth, but a converse distribution was observed from time to time in 5 - 10 cm and 10 - 15 cm soil layers. The meso-micro soil fauna collected by Baermann's and Tullgren's method had a density of 3. 333 x 10(3) - 2. 533 x 10(5) ind x m(-2) and 1.670 x 10(2) - 2.393 x 10(5) ind x m(-2), respectively, and the decreasing rate of the density with the increase of soil depth was higher for those collected by Tullgren's method. The density-group index of meso-micro soil fauna in the E. grandis plantation was the lowest in spring, but the highest in autumn or summer. There were no significant differences in the density of meso-micro soil fauna and in the density-group index between E. grandis plantation and Quercus acutissima secondary forest.
authors.affiliation: Dujiangyan Campus, Sichuan Agricultural University, Dujiangyan 611830, Sichuan, China. hyumeihx@hotmail.com
authors.forename: Yumei
authors.initials: Y
authors.lastname: Huang
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Wanqin
authors.initials: W
authors.lastname: Yang
mesh_terms: D000818:Animals; D044822:Biodiversity; D005052:Eucalyptus / Q000254:growth & development*; D007313:Insecta / Q000502:physiology; D009348:Nematoda / Q000502:physiology*; D009835:Oligochaeta / Q000502:physiology*; D012987:Soil / Q000032:analysis*
chemical_list: D012987:Soil