兰西城市群大气污染时空分布特征及其对土地利用的响应
郁文婷 , 刘学录 , 高敏 , 王鹏凯 , 张新宇 , 张晓宁
甘肃农业大学学报 ›› 2024, Vol. 59 ›› Issue (03) : 273 -283.
兰西城市群大气污染时空分布特征及其对土地利用的响应
Characteristics of spatial and temporal distribution of air pollution in the Lanzhou-Xining urban agglomeration and its response to land use
目的 研究兰西城市群大气污染物时空变化,探讨土地利用方式对大气污染物的影响。 方法 以兰西城市群大气污染数据和土地利用数据为基础,运用反距离权重法、泰森多边形法分析兰西城市群土地利用与大气污染物的时空变化特征,通过Pearson相关系数分析土地利用与大气污染间的相关关系。 结果 2015~2020年兰西城市群土地利用变化速度相对较快,耕地、林地、草地和未利用土地面积减少,建设用地和水域面积增加;大气污染物除O3浓度先降后升,其它浓度总体呈现下降趋势;6种大气污染物有显著的季节性、月度差异性和空间异质性;土地利用变化与大气污染之间存在响应关系,建设用地和耕地面积比例与CO、NO2、PM2.5、PM10的污染程度呈正比,水域和未利用地面积比例与CO、NO2、PM2.5、PM10浓度呈负相关,林地面积比例与SO2浓度呈负相关。 结论 兰西城市群大气污染的时空分布对土地利用变化给予了积极的响应,不同的土地利用类型与大气污染物之间的相应关系不同。
Objective To study the spatial and temporal variation of air pollutants in the Lanzhou-Xining urban agglomeration and to investigate the influence of land use patterns on air pollutants. Method Based on the air pollution data and land use data of Lanzhou-Xining urban agglomeration,the inverse distance weight method and Tyson polygon method were used to analyze the spatial and temporal change characteristics of land use and air pollutants in Lanzhou-Xining urban agglomeration,and the correlation between land use and air pollution was analyzed by Pearson correlation coefficient. Result The land use of the Lanzhou-Xining urban agglomeration changed relatively rapidly from 2015 to 2020,with the area of arable land,forest land,grassland and unused land decreasing and the area of built-up land and water increasing;the concentrations of air pollutants showed a general decreasing trend,except for O3,which first decreased and then increased; the six air pollutants showed significant seasonality,monthly variability and spatial heterogeneity.There is a response relationship between land use change and air pollution,the proportion of built-up and arable land area is positively correlated with the pollution level of CO,NO2,PM2.5 and PM10,the proportion of water area and vacant land is negatively correlated with the pollution level of CO,NO2,PM2.5 and PM10,and the proportion of forest land area is negatively correlated with the concentration of SO2. Conclusion The spatial and temporal distribution of air pollution in the Lanzhou-Xining urban agglomeration responds positively responses to land use changes,and the corresponding relationships between different land use types and air pollutants are different.
大气污染 / 土地利用 / 兰西城市群 / 时空变化 / 相关性分析
air pollution / land use / Lanzhou-Xining urban agglomeration / temporal and spatial variation / correlation analysis
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甘肃省国土空间规划前期专题研究项目(XZ-20190606)
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