城市住宅区绿地景观格局与径流水质关系研究

城市水污染问题日趋严重,其中的一个重要原因在于不合理的城市土地利用方式。基于ETM＋遥感影像,运用最大似然分类法对杭州市住宅小区景观进行分类,解译得到2010年杭州市住宅小区绿地景观格局专题图。采用景观指数法分析杭州市住宅小区的绿地景观格局与城市径流水质间的关系。研究表明：城市径流与绿地景观指数之间存在相关性,当绿化率小于33%时,随着绿化率的提高,径流水质明显好转;破碎度和平均邻近指数在一定范围时,绿地斑块对径流污染物的去除能力较强。为此,调整城市住宅区绿地景观格局,有利于改善径流水质状况。

Research on relationship between urban residential area green landscape pattern and runoff quality

Water pollution is becoming more and more serious, one of the important reasons is unreasonable urban land utilization ways. Based on ETM-＋- images, the landscape of Hangzhou city is classified with the maximum likelihood classification, and then the thematic map for the green landscape of the year of 2010 is obtained from the relevant interpretation. Moreover, the relationship between the urban residential area green landscape pattern and runoff quality is analyzed with the landscape index method. The study shows that there is a correlation between the runoff quality and the green landscape index, when greening rate less than 33%, with the increase in the greening rate, pollution significantly weakened; the removal efficiencies best when the fragmentation and the average near neighbor index in certain range. Therefore, the adjustment of the urban residential area green landscape pattern is favorable to improve the urban runoff quality condition concerned.