Environmental Effects Of Aerosols On Total Primary Productivity Of Vegetation

Environmental effect Of Aerosols can affect the plant saturated vapor pressure?VPD?,thus affecting the stomatal conductance of vegetation,and then affecting photosynthesis,respiration,transpiration and other metabolic processes.However,at present,the effect of aerosol on vegetation is not systematic.In this study,WRF-Chem model is used to drive the reanalysis data of European Centre for Medium-Range Weather Forecasts?ECMWF?,and the anthropogenic emission data of China's multi-scale emission inventory sharing platform?MEIC?is used as anthropogenic emission data.In this study,the North China Plain is taken as the research area,and the research time is the first half of April 2016.A group of comparative tests were set up to simulate the environment with or without the influence of anthropogenic emissions.The data of national air quality from China Environmental Monitoring Center and the data of National Oceanic and Atmospheric Administration?NOAA?ground Integrated Surface Hourly Database?ISD?were used to verify the temperature,and then the impact of aerosols on environmental factors was explored.In this study,the environmental factors with or without aerosol environment are introduced into the vegetation photosynthesis model?VPM?to obtain the gross primary productivity?GPP?in both environments.The main results are as follows:?1?Aerosol results in the decrease of the average temperature in most of the study area,and the increase of the average temperature in a small part of the study area.Because of the relationship between PM2.5 concentration and radiation,the simulation results show that there will be two cooling peaks at 7:00 in the morning and 17:00 in the evening.?2?From the regional scale analysis,two high value areas of aerosol simulation results are Yanshan Mountains in the north and Taihang Mountains in the West.The reasons are mountain blocking and mountain dredging.The relationship between aerosol environmental effect and aerosol is affected by the downward radiation and aerosol species,which results in the temperature can not change synchronously with PM2.5 concentration,and the phenomenon of temperature rising appears in some areas.?3?Influenced by aerosols,the average temperature in the daytime decreased from0.350%to 2.667%.Its environmental effect led to a 0.03%-2.55%decrease in the average GPP of the whole study area on April 6,2016?UTM?.?4?From the regional scale analysis,although the aerosol environmental effect?air temperature?is mainly cooling,there is regional warming,resulting in the highest increase of GPP in some areas by more than 5%,but the GPP in the area itself is less than 1,and its absolute value of change is very small.The absolute value of GPP decreased from 0.05gC*m^-2*day^-1-0.2gC*m^-2*day^-1 in Shandong Province,Jiangsu Province,Henan Province and Anhui Province,and increased from 0.05gC*m^-2*day^-1-0.1gC*m^-2*day^-1in Northern Jiangsu Province.?5?On April 6,2016,the impact of aerosol environmental effects on different plants was different.The biggest impact was on crops,which occupied 453900km²,accounting for 59.28%of the total vegetation area.GPP decreased by 1.45%,accounting for 92.97%of the total GPP decrease.