关键词: 棉田, 土壤线虫, 相对丰富度, 生态指数

Abstract:

In order to investigate the effect of cotton Verticillium wilt pathogens on soil ecosystem, this paper compared and studied the total numbers, amount of trophic groups and ecological indices of soil nematodes in cotton Verticillium wilt pathogens containing soil with that of control soil in Xinjiang Autonomous Region in 2013. The result indicated that a total of 42 nematode genus were identified in both pathogen infected and control areas, 36 of which were detected in the fungivores infected area, 35 were detected in the control area. The abundance of total nematodes, bacterivores and fungi ores in 0~40 cm depth soil layer were significantly lower (P<0.01) in the pathogen infected area than in the control area, while those of plant parasites and omnivore-predator nematodes had no significant difference between the pathogen infected area and the control area. The relative abundance of plant parasites and omnivore-predator nematodes were increased, while the relative abundance of bacterivores was decreased (P<0.01) in the pathogen infected area. Shannon-Wiener diversity index (H′), evenness (J′) and trophic diversity (TD) indices were increased (P<0.05), while Simpsons dominance index (λ) and nematode channel index were decreased (P<0.05) in the pathogen infected area. Above results indicated that pathogens causing cotton Verticillium wilt disease could change community structure and diversity of soil nematodes.

Key words: cotton field, soil nematode, relative abundance, ecological index