关键词: 有机肥, 土壤酶活性, 团聚体稳定性, 减氮增碳, 氮肥, 土壤生物活性

Abstract: An investigation was conducted to understand the impacts of Flaveria bidentis invasion on ground-dwelling soil animal community in three different habitats (forestland, uncultivated land, and ditch). Pitfall trap was used to investigate grounddwelling soil animals every two weeks from April 26 to September 17 in 2012. A total of 439515 individuals were collected in three habitats, belonging to 3 phyla, 7 classes, and 21 orders, among which Formicidae was the dominant taxa in the community, and the relative abundance of other taxa was smaller. As the result demonstrated, F. bidentis could provide habitats for Formicidae, Isopoda, Gryllidae and Araneae which like shady and moist environment, thereby had an effect on the community structure and diversity of ground-dwelling soil animal community. Such impact, mainly related to growth conditions of F. bidentis, was weaker in forestland habitat but stronger in uncultivated land habitat and ditch habitat, and became more obvious during the season of growth peak for F. bidentis. In conclusion, the microclimate of three habitats might be changed and the ground-dwelling soil animal community structure was affected after the invasion of Flaveria bidentis, which increased ground-dwelling soil animal diversity.

Key words: soil enzyme activity, aggregate stable, mineral N fertilizer reduction and organic fertilizer substitution, N fertilizer, organic fertilizer, soil biological activity.