南雄红层盆地典型植被类型的土壤动物群落特征

Characteristics of soil fauna of typical vegetation types in the Red Bed Basin of Nanxiong

为了解南雄红层盆地土壤动物群落组成及结构,阐明不同植被类型下土壤动物群落特征及其影响因素,依据盆地内典型植被和地貌特征,选取马尾松林、相思林、新银合欢林、灌草地、草地及红砂岭共6种样地,研究采用多样性分析、均匀性分析及相关性分析等方法。结果表明:1)不同植被类型下土壤动物类群数、个体数及多样性指数差异性不显著(p>0.05),土壤动物个体数量和多样性指数均表现为新银合欢林最高;2)土壤动物类群数和个体数与土壤理化性质显著相关,土壤有机质、碱解氮是影响红层地貌区土壤动物群落结构的重要环境因子;3)南雄红层丘陵地貌区红砂岭土地退化严重,土壤动物群落结构单一,新银合欢林表现出更合理、更稳定的土壤动物群落结构。

In order to understand the composition and structure of soil fauna communities in the Nanxiong Red Layer Basin,and to elucidate the characteristics of soil fauna communities and their influencing factors under different vegetation types,six kinds of plots were selected according to the typical vegetation and geomorphological characteristics in the basin,and six kinds of plots were selected,such as masson pine forest,acacia forest,new silver acacia forest,shrub grassland,grassland and red sand ridge,and the methods of diversity analysis,uniformity analysis and correlation analysis were used for research.The results showed that:1)the number of soil animal groups,individuals and diversity index were not significantly different under different vegetation types(p>0.05),and the number of soil animal individuals and diversity index were the highest in the new acacia forest;2)the physical and chemical properties of soil were significantly related to the number of taxa and individuals of soil animals,and soil organic matter and alkali nitrogen relysis were important environmental factors affecting the structure of soil fauna communities in the red layer landform.3)The land degradation of Hongshaling in the red layer hilly landform area of Nanxiong is serious,and the soil animal community structure is single,and the new silver acacia forest shows a more reasonable and stable soil animal community structure.