生活垃圾堆肥基质草坪建植体系接种草坪土壤线虫多样性特征

通过城市生活垃圾堆肥基质草坪建植体系接种草坪土壤线虫,研究了线虫数量、科属分类、营养类群等线虫多样性变化.结果表明,接种草坪土壤线虫 4 个月后,垃圾堆肥基质中共鉴定出线虫4科7属,包括植物寄生性线虫、食真菌线虫和食细菌线虫3个营养类群;垃圾堆肥基质草坪建植体系中线虫总数明显少于土壤基质.在接种草坪线虫的土壤基质草坪建植体系中,植物寄生线虫为优势营养类群,盘旋线虫属仍为优势属,相对多度达到83.3%,显著高于本底土壤45.1%.在接种草坪土壤线虫的垃圾堆肥基质草坪建植体系中,土壤本底中处于优势属的植物寄生类线虫如盘旋线虫属和螺旋线虫属基本消失了,表明垃圾堆肥基质对植物寄生类群的生长与繁殖表现出明显的抑制作用,优势属也发生了很大变化,食细菌类群的头叶属和丽突属成为优势属,相对多度分别为67.0%和14.0%.因此,从草坪土壤线虫危害角度来说,以垃圾堆肥作为草坪基质将会为草坪植物生长创造良好的基质环境.

The characteristics of nematode diversity in turf medium derived from municipal solid waste compost

This study investigated the characteristics of soil nematode diversity in nematode-inoculated turf medium derived from municipal solid waste (MSW) compest. After 4 months nematode inoculation, 4 families and 7 genera of nematodes were identified in the MSW compost medium, which belonged to three trophic groups, namely plant-parasites, fungivores and bacterivores. In the MSW compost medium the plant-parasite was the dominant trophic group with Rotylenchus was the dominant genus. The relative abundance (RA) of Rotylenchus was 83.3%, which was significantly higher than that in the background soil (control). However, the number of genera in MSW compost medium was less than that in the background soil. Cephalobus and Acrobeles of bacterivorous nematodes were found as the dominant genera in the MSW compost medium, with a RA of 67.0% and 14.0%, respectively. In contrast, Helicotylenchus and Rotylenchus, which were found as the dominant genera of plant-parasitic nematodes in background soil, were not found in the inoculated MSW compost medium, suggesting that MSW compost inhibited the growth and propagation of plant-parasitic nematodes. These findings suggest that MSW compost medium could provide a favorable environment for turfgrass growth.