The "Meteorological Drought Level" is one of the eight meteorological national standards that began on November 1, 2006. It is the first national standard for monitoring drought disasters issued by China, which will end up with many meteorological drought monitoring and assessment methods in China. The history of inconsistent levels of droughts that have been achieved by various localities and departments indicates that China will have unified standards in meteorological drought monitoring and drought impact assessment, and meteorological drought monitoring technologies and assessment methods will be standardized and standardized. Drought monitoring and assessment will There are rules to follow. The National Standard for Meteorological Drought Levels stipulates the methods of calculating the meteorological drought index nationwide, the grading standards, the nomenclature and the methods of use, and defines terms for the different processes of meteorological drought development. The national standards for meteorological drought grades stipulate five single indexes for monitoring drought and comprehensive indexes for meteorological drought. The five individual indexes are: precipitation and precipitation anomaly percentage, standardized precipitation index, relative humidity index, soil moisture drought index, and Palmer Drought Index. Meteorological drought composite index CI A composite index based on the standardized precipitation index, relative humidity index, and precipitation. The National Standard for Meteorological Drought Grade classifies drought into five levels and assesses the extent to which droughts of different levels affect agriculture and the ecological environment: 1. Normal or wet warts, characterized by normal precipitation or more than usual, wet surface, no drought; 2. Light drought, which is characterized by less precipitation than usual, dry air on the surface, insufficient moisture in the soil, and slight effects on crops; 3. Medium drought, characterized by continuous less precipitation than usual, dry soil surface, insufficient moisture in the soil, and wilting during the day, causing certain impact on crops and the ecological environment; 4. Severe drought, which is characterized by a serious shortage of water in the soil, a thick dry soil layer on the soil, wilting plants, dry leaves, fruit shedding, serious impact on crops and the ecological environment, and a certain degree of industrial production, drinking water for humans and animals. influences; 5. Extremely dry, characterized by a serious lack of water in the soil for a long time, dry and dead plants on the surface, serious impact on crops and ecological environment, industrial production, drinking water for people and livestock have a greater impact. The "National Meteorological Drought Level" national standard is standardized across the country and is spatially and temporally comparable. It can objectively describe the process of occurrence, development, persistence, and release of droughts, and the drought monitoring indicators of drought severity and scope. Display Stands,Oem Showcase,Wall Mounted Showcase Fabrication,Display Showcase FCX Metal Structure Co., Ltd. , https://www.fcxmetal.com