Meteorological Risk Assessment Of Flood And Drought Disasters Of Table Grapes In Bohai Rim

Water was an important condition that affects the growth of grapes.The profit an d loss of water can inhibit the growth and development of grapes,thereby reduced th e yield and quality of grapes.In this study,from the point of view that the profit an d loss of water was easy to cause grape disease risk,the drought and downy mildew diseases with high risk during grape growth were selected to study the meteorological conditions that may cause them to occur,the Bohai Rim region,one of the main grap e producing areas in China,was selected as the research area.Table grapes were used as the research object.Based on the 1981-2014 Bohai Rim region including Hebei P rovince,Liaoning Province,Shandong Province,Beijing,and Tianjin.The daily meteor ological data of 60 meteorological stations in the region,used Arc GIS interpolation mapping,Fortran programming,SPSS data analysis and other research methods,explor ed the suitability of Table grape cultivation in the Bohai Rim region from a meteorol ogical perspective,and studied the area due to moisture Spatial and Temporal Distribut ion of Drought Disasters and Downy Mildew Diseases of Fresh Grapes Caused by Pr ofit and Loss,and Analysis of Their Disaster Risks,with a View to Providing Scienti fic Basis for Risk Management of Meteorological Disasters in the Fresh Grape Industr y The main conclusions of this study are as follows:(1)The water and temperature conditions in the Bohai Rim region can better me et the growth and development requirements of table grapes.In terms of water suitabi lity,the precipitation at all growth stages generally meet the water demand of fresh gr apes,but the temporal matching between precipitation and water demand is poor.In te rms of spatial distribution,the water resources in the entire Bohai Rim region were u nevenly distributed,The precipitation was distributed from west to east;the active ac cumulated temperature during the growing season in the Bohai Rim region is suitable for planting a variety of ripe grapes,and the active accumulated temperature in each growing period of grapes meets the thermal conditions required for high-quality grapes.(2)There was a higher risk of drought in fresh grapes in the Bohai Rim region.During the growth stages of fresh grapes,the risk of drought was higher in the colori ng maturity stage and the new shoot growth stage,and the risk of drought in the fruit growth stage was lower.From the perspective of spatial distribution,the drought in the region was mainly light and severe.The high drought-prone areas were concentrat ed in the northwest of Hebei Province,while the risk of drought in eastern Liaoning was relatively small.From the perspective of time,the impact of drought in the vario us stages of growth of fresh grapes in the Bohai Rim region was very wide.As the years progress,the impact of drought in the Bohai Rim region has narrowed in recent years.(3)There was a certain risk of downy mildew on fresh grapes in the Bohai Rim region.From the perspective of time distribution,the high-risk period for the occurren ce of downy mildew of fresh grapes in the Bohai Rim region is concentrated from ea rly July to early August.It was just at the beginning of the fruit growth period and t he early stage of grape coloration.The range was wide,most of which were all regio nal diseases.From the perspective of spatial distribution,the high-risk areas of the dis ease were concentrated in the eastern coastal areas of Liaoning,and the frequency of the disease was up to two times in three years(> 66.7%).