关键词: 双季稻, 光分布, 模拟模型, 光合生产, 株型

Abstract: Moso bamboo has expanded its range by invading the broad-leaved forests of southern China. Its invasion can alter soil carbon and nutrient cycling in invaded habitat because plant traits of moso bamboo differ from native species. Here, we examined the effects of moso bamboo invasion on soil active organic carbon and nitrogen along a transect of evergreen broad-leaved forest, mixed bamboo and broad-leaved forest, and pure moso bamboo forest. The concentrations of watersoluble organic carbon and nitrogen in soils and microbial biomass carbon and nitrogen were measured to examine the effects of moso bamboo invasion on soil active organic carbon and nitrogen in evergreen broad-leaved forest and the seasonality of such effects. The mean annual concentrations of watersoluble organic carbon and nitrogen and microbial biomass carbon and nitrogen were significantly different among forest types. The overall performance was in the order of broad-leaved forest > mixed forest > moso bamboo forest (P<0.05), which was generally consistent across seasons. Water soluble organic carbon and nitrogen contents and microbial biomass carbon and nitrogen of the three habitats experienced paralleled seasonal changes. Soil water soluble organic carbon content and microbial carbon were the highest in autumn and the lowest in summer. There was a significant positive relationship between the contents of soil active organic carbon and nitrogen (P<0.01). Moso bamboo invasion into evergreen broad-leaved forests reduced soil active organic carbon and nitrogen contents, which decreased the contents of original soil nutrients and changed the structure of the original soil organic carbon and nitrogen pools. Our results provide insight into the management of abandoned moso bamboo stands and basic data for future study of the effects of moso bamboo invasion on soil properties.

Key words: photosynthetic production, light distribution, simulation model., double cropping rice, plant type