Based on data of meteorological elements in the meteorological station in North Yandang Mountains during 1960- 2013,temporal variations in days of sea of clouds
Based on PSR framework method,the land ecological security evaluation index system of 16 cities of Anhui Province was constructed.The land ecological security v
At present,main sludge disposal manners of China contain landfill,composting,natural drying and incineration. A large number of sludge does not obtain standardi