重庆市农产品产地大气降尘时空变异研究

目的]探索重庆市农产品产地大气降尘时空变异。方法]采用地统计学方法和地理信息系统,研究重庆市农产品产地大气降尘的时空变异特征。结果]大气降尘季节均值符合高斯模型,具有强烈的空间自相关性;4个季节降尘量符合高斯或球状模型,具有中等空间相关性。通过普通克里格插值研究发现,重庆西南部江津区大气降尘量最高,向北、东方向逐步降低。同时,大气降尘量呈现夏季最高,春季次之,秋冬季最低的规律。以江津区为中心的渝西地区应作为大气降尘污染的重点控制区。结论]该研究可为农田重金属的防治提供科学依据。

Study on Spatio-temporal Variation of Atmospheric Dustfall in Agricultural Producing Areas of Chongqing

Objective]To study spatio-temporal variation of atmospheric dustfall in agricultural producing areas of Chongqing.Method]Spatio-temporal variation of atmospheric dustfall in agricultural producing areas of Chongqing were studied with the methods of geostatistics and GIS.Result]The results showed that the seasonal mean value of dustfall was best described by gaussian model,and the spatial variation was in strong spatial correlation.The dustfall of four seasons were best described by gaussian model or spherical model,and the spatial variation were in moderate spatial correlation.The results of ordinary kriging showed that for the spatial distribution of dustfall,Jiangjin District of the southwestern Chongqing was the highest,and it tended to decrease toward the east and north direction.Also,the atmospheric dustfall were highest in summer,spring small,lowest in autumn and winter.The west areas around Jiangjin District in Chongqing were the key control regions for the pollution of dustfall.Conclusion]The study can provide scientific basis for the prevention and control of heavy metals in farmland.