基于i-Tree模型的郑州市行道树生态效益评估

Ecological Benefit Evaluation of Street Trees in Zhengzhou City Based on i-Tree Model

抽样调查了郑州市道路总长度的10%共128条道路的行道树,运用i-Tree模型对其生态效益进行了评估.结果显示,郑州市行道树共14科20属22种,80%树木胸径10~30 cm,90%树木健康水平为良好以上;总生态效益2 476.77万元,其中截留雨水效益占55.03%,其他依次为碳储存、美学、CO_2吸收、节能和空气质量改善;总生态效益中,悬铃木的贡献率69.43%,其次为国槐和白蜡;单株加权平均效益为2106元/株,悬铃木最高,其次为臭椿、国槐、白蜡和雪松;大叶女贞、银杏和枇杷无论是贡献率还是单株加权平均效益均最低.

In this paper,the samples of street trees were surveyed on 10% total road length with 128 roads in Zhengzhoucity,and the ecological benefit was evaluated by i-Tree model. The results showed that there were 22 species of streettrees which belonged to 14 families and 20 genera in Zhengzhou City,in which 80% had DBH from 10 cm to 30 cm and 90% were in good health level. We found the total ecological benefits was 24.767 7 million yuan,in which the stormwaterinterception benefit reached 55.03%,and the others in turn were carbon storage,aesthetics,CO2 absorption,energysaving and air quality improvement. As to the contribution of the total ecological benefits,the Platanus acerifolia wasprovided 69.43% which followed by Sophora japonica Linn and Fraxinus chinensis. The weighted average benefit was 2106 yuan per individual. The Platanus acerifolia was the highest which followed by Ailanthus altissima（Mill）Swingle,Sophora japonica Linn,Fraxinus chinensis and Cedrus deodara（Rox.）G Don. The Ligustrum lucidum Ait,Ginkgo biloba Linn and Eriobotrya japonica had the lowest contribution rate and weighted average benefit.