论文部分内容阅读
为了解植被演替过程的土壤线虫群落结构与功能变化,本研究于2015年旱季(4月)与雨季(8月)对哀牢山不同演替阶段森林的土壤性质、微生物量和线虫群落进行取样调查。结果表明,随着植被演替进程,线虫群落总密度及类群数,植食性线虫、食真菌线虫和捕食-杂食性线虫的数量表现增加,而食细菌线虫的数量下降。线虫群落的成熟度指数(MI)、营养均匀指数(TD)为演替后期大于前期,瓦斯特乐斯指数(WI)的变化相反。典范冗余分析显示,土壤水分、p H值和无机N是线虫群落的重要影响因素。季节变化对不同演替阶段线虫群落结构的作用(R2)程度表现为常绿阔叶林(14%)、滇山杨林(15%)<旱冬瓜林(22%)<茶地(33%)。随植被演替进程,土壤线虫食物网复杂程度增加,对植物根部资源及真菌资源的依赖程度提高,同时增加了其营养结构、群落结构和群落功能的季节稳定性。
In order to understand the structure and function of soil nematode community during vegetation succession, this study was conducted on the soil properties, microbial biomass and nematode community in different succession stages of Ailao Mountain in the dry season (April) and rainy season (August) Sample survey. The results showed that with the succession of vegetation succession, the total population density and number of nematode communities, the numbers of phytophagous nematodes, fungi nematodes and predation-omnivore nematodes increased, while the number of bacteria-eating nematodes decreased. The nematode community’s maturity index (MI) and nutrient evenness index (TD) were the opposite in the late succession and the Valstar index (WI). Canonical redundancy analysis shows that soil moisture, p H value and inorganic N are the important influential factors of nematode community. The effect of seasonal variation on the nematode community structure in different successional stages (R2) showed that the extent of the R2 was 14% in the evergreen broad-leaved forest, 15% in the Yanshan Yanglin forest, 22% ). With the process of vegetation succession, the complexity of soil nematode food web increases, and the dependence on plant root resources and fungal resources increases. Meanwhile, it increases the seasonal stability of nutrition structure, community structure and community function.