PARENT SESSION
Contributed Oral Session 166: Soil Communities and Plant-Root Interactions
Friday, August 12, 8:00 AM - 11:30 AM, Meeting Room 522 A, Level 5, Palais des congrès de Montréal

Distribution and diversity of nematode communities under different land use types in an aquic brown soil.

Liang, Wenju^*,1, Ou, Wei^{1, 2}, Jiang, Yong^*,1, Li, Qi^{1, 2}, Wen, Dazhong¹, ¹ Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning, China² Graduate School of the Chinese Academy of Sciences, Beijing, Beijing, China

ABSTRACT- A field experiment was installed at the Shenyang Experimental Station of Ecology to study the vertical distribution and diversity of nematode communities down to a depth of 150 cm under four land use types (paddy field, maize field, fallow field and woodland) in an aquic brown soil of Northeast China. The results showed that the number of total nematodes, trophic groups exhibited a gradual decrease trend with increasing soil depth under different land use types. The majority of nematodes were present in 0−30 cm soil layers. Bacterivores were found to be the most abundant group in paddy field, while plant parasites were observed to be the most abundant group in the maize field, fallow field and woodland. 54 genera were recorded throughout the four land use types in our study. Shannon index reached lowest value at 120−150 cm depth under each land use type. The woodland treatment supporting greater basal resource inputs tended to result in a higher diversity of nematodes. The number of genera reached maximum at 5−10 cm depth under each land use type. The faunal profiles showed that soil food webs in the fallow field and woodland were structured, and those in the paddy and maize fields were stressed.

Key words: soil nematodes, vertical distribution, diversity, land use type