摘要
对江苏盐城湿地保护区内不同植被带土壤线虫的群落结构特征进行了研究.结果表明:调查共鉴定出20科39属,优势属和常见属的数量占总个体数的90%以上;不同植被类型的滩涂湿地土壤线虫总数存在明显差异性,线虫数量范围为每100g干土79～449条,小麦地显著高于其他植被带,光滩地数量最少.线虫群落生态指数对植被带有不同的响应,土壤线虫群落多样性指数H、均匀度指数J在不同植被带的分布依次为:苇草带>盐蒿带>小麦地>米草带>光滩带,而优势度指数λ的分布为:光滩带>米草带>小麦地>盐蒿带>苇草带,表明光滩带的线虫群落多样性和稳定性小于其他植被带,土壤线虫群落趋于单一化;成熟度指数MI表现为保护区内未开垦植被带高于已开垦的小麦地,说明农田受外界干扰明显.不同植被带间的线虫群落结构存在显著差异,各植被带的最大贡献物种各不相同.土壤理化性状与线虫数量、营养类群、生态指数存在明显的相关关系.表明线虫群落的变化能很好地反映植被带生境的多样性,土壤线虫可作为湿地生态系统中一个重要的生物指示因子.
An investigation was conducted on the characteristics of soil nematode communities in different vegetation belts （Spartina alterniflora belt, Sa; Sttaeda glauca belt, Sg; bare land, B1; Phragmites australis belt, Pa; and wheat land, W1） of Yancheng Wetland Reserve, Jiangsu Prov- ince of East China. A total of 39 genera and 20 families of soil nematodes were identified, and the individuals of dominant genera and common genera occupied more than 90% of the total. The total number of the nematodes differed remarkably with vegetation belts, ranged from 79 to 449 individu- als per 100 grams of dry soil. Wheat land had the highest number of soil nematodes, while bare land had the lowest one. The nematode ecological indices responded differently to the vegetation belts. The Shannon index （H） and evenness index （J） decreased in the order of Pa 〉 Sg 〉 W1 〉 Sa 〉 B1, and the dominance index （ h ） was in the order of B1 〉 Sa 〉 WJ 〉 Sg 〉 Pa, sugges- ting that the diversity and stability of the nematode community in bare land were lower than those in the other vegetation belts, and the nematode community in the bare land tended to be simplified. The maturity index （MI） was higher in uncultivated vegetation belts than in wheat land, suggesting that the wheat land was disturbed obviously. The nematode community structure differed significant- ly with vegetation belts, and the main contributing species in different vegetation belts also differed. There existed significant correlations between the soil physical and chemical characteristics and the nematode numbers, trophic groups, and ecological indices. Our results demonstrated that the chan- ges of soil nematode community structure could be used as an indicator well reflecting the diversity of vegetation belt habitat, and an important bio-indicator of coastal wetland ecosystem.
出处
《应用生态学报》
CAS
CSCD
北大核心
2012年第11期3057-3064,共8页
Chinese Journal of Applied Ecology
基金
江苏省野生动植物(含土壤动物
经济昆虫)物种资源调查项目(R201061)资助
关键词
滩涂湿地
植被类型
土壤线虫
群落结构
coastal wetland
vegetation type
soil nematode
community structure.
