9Jim C ,Wendy Y. Ecosystem services and valuation of urban forests in China[J]. Cities, 2009,26(4): 187-194.
10Roy S, Byrne J, Pickering C. A systematic quantitative review of urban tree benefits, costs, and assessment methods across cities in different climatic zones[J]. Urban Forestry & Urban Greening, 2012, 11 (4):351-363.