%0 Journal Article
%T RELATIVE ROLES OF MICROORGANISMS AND SOIL ANIMALS ON NEEDEL LITTER DECOMPOSITION IN A SUBALPINE CONIFEROUS FOREST<br>亚高山针叶林土壤动物和土壤微生物对针叶分解的作用
%A Abstract
%A <br>田兴军
%A 立石贵浩
%J 植物生态学报
%D 2002
%I Editorial Office of Chinese Journal of Plant Ecology
%X Eighty thin-sections of the subalpine coniferous organic layer were used for observing the effect of microorganisms and animals on the needle decomposition. The distribution patterns of fungal spores and bacteria along the upper 8 cm soil profile of the forest floor were counted using the plate culture method. The changes in needle number and C/N ratio of litter suggest that the decomposition of the needles could be divided into three stages. Colony forming units (CFU) of fungi were higher in the surface 0-2 cm layer (decomposition Stage 1) than in deeper layers. In contrast, the CFU of bacteria was lower in the surface 0-2 cm layer (Stage 1) than in deeper layers. The needles with faeces increased from 0 cm to 2 cm layer, decreased sharply from 2 cm to 4.5 cm layer (Stage 2) and slowly in deeper than 4.5 cm layer (Stage 3). Decomposition of needle litter was clearly apparent with increasing depth of the forest floor. Needles in the surface layer of soil were colonized and then destroyed by fungi resulting in the rupturing of needle epidermis. The destroyed epidermis led to the invasion by animals in the inner tissue. Thus, a large number of needles disappeared from the 2 cm to 4.5 cm layer due largely to the activity of animals. Faunal induced decomposition of the needles resulted in the needles changing into fragments and faeces. The size of residues decreased but the surface area of whole fragments increased. Microorganisms could easily colonize the debris and decay it. This may be a big contribution to the decomposition of litter by bacteria in later stages or in deeper layer of the forest floor.
%K Soil animals
%K Fungi
%K Bacteria
%K Coniferous forest
%K Decomposition<br>土壤动物
%K 真菌
%K 细菌
%K 针叶林
%K 分解
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=2F2173CCFF292BF447DC2681EA33BBAE&aid=3FB4A5DCD176F922&yid=C3ACC247184A22C1&vid=96C778EE049EE47D&iid=38B194292C032A66&sid=4290346F7268639E&eid=96A53C367B5173D7&journal_id=1005-264X&journal_name=植物生态学报&referenced_num=11&reference_num=30