广州绿地土壤线虫种类和多样性特征

Guangzhou greenbelt soil nematode types and diversity characteristics

以广州市荔湾区城市绿地为起点往东北延伸至从化流溪河自然保护区,建立了长100 km、宽10 km的绿地生态梯度样带,采用样方取样分析法研究城市化进程中广州绿地土壤线虫的种类和多样性的变化。共鉴定了土壤线虫17 538只,分属2纲,4目,16属,食细菌性线虫占75.82%,为优势种群,其它三类占24.18%。样带上不同距离的土壤线虫Shannon-Wiener指数和Simpson指数的变化规律趋于一致,距离市中心距离45 km处是土壤线虫多样性的转折点,多样性变化趋势为先减小后增大;人口密度极低区域的土壤线虫属数最多,人口密度极低和低的区域土壤线虫Shannon-Wiener指数、Simpson指数多样性和Pielou均匀度最高。

Changes of soil nematode types and diversity were investigated in this study by taking an ecological green-land with 100 km long and 10 km wide from Liwan District of Guangzhou, going northeast and extending to Conghua Stream Natural Reserve as an example. Totally 17 538 soil nematodes were identified, belonging to two class, four order and sixteen genus. Bacteria-feeding nematode occupied 75.82% and it was the dominant species. The change trend of Shannon-Wiener index and Simpson index of soil nematodes from different transects line were the same, and at the distance of 45 km from the city center, the soil nematode diversity had a turning point, which decreased firstly and then increased. The areas with extremely low population density had the most genus, and also had the highest soil nematode Shannon-Wiener index, Simpson index diversity and Pielou evenness.