Spatial And Temporal Differentiation Of PM 2.5 In Jiangsu Province And Its Impact On Land Use

Nowadays,with the continuous development of urbanization,China has become the most polluted areas of aerosols,PM_2.5 become the primary pollutant in most regions.Our government attaches great importance to air quality problems.PM_2.5 is included in the newly revised "ambient air quality standards" in February 2012.In this context,Jiangsu Province,as a severe contamination of PM_2.5,should deeply realize the characteristics of PM_2.5 pollution,and on this basis,analyzing the impact on the PM_2.5 concentration combined with land use and landscape pattern.It can provide basis for scientific understanding and addressing regional air pollution problems,and promote harmonious development of the urban land use and the atmospheric environment in a more scientific way of land use and landscape pattern planning.The characteristic on time and space separation of PM_2.5 in Jiangsu is obtained by the method of RS,GIS and statistical analysis.To use geographic information systems and remote sensing methods delimit land use types,and analyze the concentration difference of PM_2.5 in different land use types,then select the relevant landscape metrics in FRAGSTATS from the perspective of landscape ecology,finally,analyze the correlation between PM_2.5 and landscape metrics,draw the following conclusions:?1?PM_2.5 concentration in Jiangsu has a differential characteristic in time and space.Select day,month,quarter as time scales,then find PM_2.5 concentration has obvious difference in different seasons.PM_2.5 pollution is most severe in winter,in summer and autumn,its concentration is much lower,the lowest is in autumn.Select city and monitoring site as spatial scales.It's a trend of "island is high,coastal is low;south is higher than north in island " in Jiangsu Province.Based on city,PM_2.5 concentration in Yancheng is the lowest,Lianyungang,Yancheng and Nantong's are slightly higher;the highest is Nanjing,Taizhou is behind it.Based on monitoring point,Yancheng Development Zone is the site of best air quality,Lianyungang Hengrui Pharmaceutical and Yancheng Wenfeng school have low PM_2.5 concentration;Nanjing Puko and Maigaoqiao,Taizhou Lotus have high PM_2.5 concentration.?2?There is an unequal distribution of land use types and a significant regional difference of landscape pattern in Jiangsu.It's divided into farmland,woodland,grassland,water,construction land and unused land,and the primary land ues types are arable land?61.39%?,construction?19.48%?and water area?15.17%?,but the woodland,grassland and unused land were little.In the northern,central and southwestern,the land fragmentation is high,but the southeast and coastal region's landscape heterogeneity is small.The southwest has large landscape fragmentation of cultivated land and water,and the pattern is complex,while the coastal region in middle part is relatively simple;land fragmentation of construction in northern is greater than south,and the complexity of the patch shape in south are higher.?3?The land type and landscape pattern affect the PM_2.5 concentration to some extent.On the land type,PM_2.5 concentration will decrease when arable land and water area increase,but construction land is opposite.Farmland and construction land respectively have negative effects and positive effect when PM_2.5 concentration is low.Water area has negative effects on PM_2.5 of high concentration.Overall,the greater the time scale,the more sensitive to the landscape pattern PM_2.5 is,and the winter and summer are more sensitive.On the landscape pattern,the landscape fragmentation smaller is,diversity less is,connectivity higher is,and there is a leading role,to reduce PM_2.5 concentration more helpful is.The more broken of arable land is,PM_2.5 concentration is higher;the air quality will be worse when the scale of construction land is greater,more concentrated and shapes are more complex;there is a larger contribution to PM_2.5 at its high concentration when plaque waters are more broken.