城市绿地类型对土壤线虫多样性的影响及生物指示值分析

【目的】为探讨城市绿地土壤线虫群落多样性特征以及生物指示意义，揭示不同绿地类型中土壤线虫群落的生物多样性和功能多样性分布规律。【方法】调查道路绿地、居住绿地、公园绿地和风景名胜区绿地中土壤线虫群落特征，分析线虫群落的生物多样性和功能多样性特征并利用生物指示值法分析线虫物种指示值。【结果】研究调查发现线虫共46属，不同绿地类型明显改变了线虫群落生物多样性和功能多样性（p＜0.05）；风景名胜区绿地的生物多样性水平最高，其次为公园绿地，居住区绿地最低；线虫成熟度指数和线虫通路指数在道路绿地中最低，在居住绿地和公园绿地中增加，风景名胜区中最高（p＜0.05）。Aphelenchoides、Cylindrolaimus以及Epidorylaimus是道路绿地的指示生物；Bastiania是公园绿地的指示生物；Leptonchus、Monhystera和Clarkus是风景名胜区绿地的指示生物。【结论】不同城市绿地对线虫群落多样性产生了明显的影响，研究结果进一步明确了线虫类群对城市生态系体绿地生境的指示意义，为城市生物多样性保护提供了理论依据。

Effects of Urban Green Land Types on Nematode Diversity and Bio-indication Analysis

The characteristics of urban green land diversity is an important subject of urban ecosystem research under the background of rapid urbanization and global climate change. In this study, the characteristics of nematode communities were studied under different green land types. Forty-six genera were identified for nematode. Different types of urban green land types significantly changed the indices of nematode biodiversity and nematode function diversity (P<0.05). Scenic area green land had the highest of nematode biodiversity, followed by park green land, and residential green land was the lowest. The maturity index of free living nematode and the channel ration of nematode were the lowest in the road green land, increased in the residential green land and park green land and reached the highest value in scenic area green land.Aphelenchoides, Cylindrolaimus and Epidorylaimus were the indicator species for road green land, Bastiania for park green land, while Leptonchus, Monhystera and Clarkus for scenic area green land. The significance of nematode on the ecosystem of urban green lands was further revealed, and the theoretical basis for the protection of urban biodiversity was provided.