7Bonan G B. The microclimates of a suburban Colorado (USA) landscape and implications for planning and design [J]. Landscape and Urban Planning, 2000,49 : 97-114.
8Chen W Y,Jim C Y. Evaluation and valuation of the diver- sified ecosystem services provided by urban forest[C]// Carreiro M M, Song Y C, Wu J G. Ecology, planning and management of urban forests. New York:Springer Verlag,2008:53-83.
9Zhang K X,Wang R, Shen C, et al. Temporal and spatial characteristics of the urban heat island during rapid urbani- zation in Shanghai, China [J] E ncironmental Monitoring and Assessment, 2010,169 : 101-112.
10Tikhonov V P,Tsvetkov V D, Litvinova E G, et al. Genera- tion of negative air ions by plants upon pulsed electrical stimulation applied to soil[J]. Journal of plant physiology, 2004,51:414-419.