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麦冬化感作用对城市绿地原位土壤的影响

Allelopathic effects of Ophiopogon japonicus on in-situ soil in urban green spaces

  • 摘要: 为进一步说明化感作用影响机制,为未来城市绿地的植物配置和养护管理提供一定理论参考。制备出麦冬梯度浓度水浸提液对土壤样品进行处理,并对梯度浓度水浸提液处理下的中小型土壤动物群落结构特征进行数据分析。(1)麦冬水浸提液试验共捕获中小型土壤动物3148只,隶属于14目39科。(2)水浸提液不同浓度处理下中小型土壤动物个体数存在显著差异(P<0.05),通常随浓度增大而减少。(3)不同浓度麦冬水浸提液处理下中小型湿生土壤动物群落结构特征存在显著差异(P<0.05)。(4)不同处理时长间,中小型土壤动物群落多样性随时长增加而降低。(5)中小型湿生土壤动物较之干生土壤动物对化感物质水浸提液响应更灵敏。麦冬化感作用会影响中小型土壤动物群落多样性特征,在实际应用中应综合考虑植物搭配与对土壤动物的长远影响,注意栽植密度,建设可持续的园林景观。

     

    Abstract: In order to further explain the mechanism of allelopathy and provide a theoretical reference for the future plant configuration and maintenance management of urban green spaces. Soil samples were treated with water extracts ofOphiopogon japonicus at gradient concentrations, and the community structure characteristics of meso-micro soil fauna were analyzed. The results show that: (1) A total of 3148 meso-micro soil fauna belonging to 14 orders and 39 families were captured and used in the experiment with the water extracts of O. japonicus. (2) There were significant differences in the number of individuals of meso-micro soil fauna under different concentrations of water extracts (P<0.05), and the number of individuals of meso-micro soil fauna decreased with the increase of concentration. (3) There were significant differences in the community structureof meso-micro wet soil fauna under different concentrations of water extracts (P<0.05). (4) The diversity of meso-micro soil fauna decreased with the increase of treatment time. (5) The meso-micro wet soil fauna were more sensitive to the water extracts of allelochemicals than meso-micro dry soil fauna. Our study showed that the allelopathy of O. japonicus can affect the diversity characteristics of meso-micro soil fauna communities. In practical application, we should comprehensively consider the long-term effects of allelopathy on plant collocation and soil fauna, pay attention to planting density, and build a sustainable landscape.

     

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