南京市典型森林群落枯枝落叶层的生态功能研究

对南京市5种典型森林群落枯枝落叶层现存量、营养元素氮磷贮存量、持水量以及吸纳重金属等生态功能的研究结果表明,5种典型森林群落枯枝落叶层现存量、对氮的贮存能力以及最大拦蓄量均以麻栎-栓皮栎群落最大;对磷和5种重金属的贮存量以银杏群落最大,麻栎-栓皮栎群落次之;枫香-桂花和三角枫群落的各项生态功能相对较弱。建议在南京市的城市森林规划和建设中,应保护好现存的地带性植物群落———以麻栎-栓皮栎为优势种的落叶阔叶林群落或营建类地带性植物群落,维护林地枯枝落叶层的完整性,将有助于改善城市生态环境。

Ecological Functions of Forest Floors of Typical Forest Communities in Nanjing

A study was carried out on ecological functions of forest floor,such as standing stock of litters,N and P storage capacity,water holding capacity and detainment of heavy metals,of five typical forest communities in Nanjing.Results show that with regard to standing stock of litters,the water holding capacity and N storage capacity of forest floor,the Quercus acutissima-Q.variabilis community is the highest among the five forest communities,while as far as P and heavy metal storage capacity is concerned the Cinkgo biloba community is the highest and followed by the Quercus acutissima-Q.variabilis community.Comparatively,the Liquidambar formosana and Acer buerqerianum communities are inferior in all these aspects.So in planning and construction of urban forest parks in Nanjing,it is essential to preserve the existing zonal plant communities,Quercus acutissima-Q.variabilis-dominated deciduous broadleaved forest,or build up quasi-zonal plant communities,and maintain integrity of the forest floor of the forestland,which will eventually help improve the urban ecological environment.