农田面源污染管理要综合考虑土壤氮素的累积和滞后时间,以应对不同气候条件下水体污染的风险。华北农业过量施肥以及污水排放等造成土壤氮素累积的问题较为突出,在极端降水等特定水文条件下土壤累积氮素进入地表水或地下水,使得污染物迁移过程、水体硝酸盐的来源等发生 ...

BEIJING, May 28 (Xinhua) -- A group of Chinese researchers has developed a novel air toxicity monitoring system (ATMS) to conduct real-time and online monitoring of the health effects of air pollution ...

MANILA, May 17 (Xinhua) -- The Philippines' Department of Health (DOH) on Saturday said it is "actively monitoring" COVID-19 infections in Southeast Asia amid a reported rise in cases in parts of the ...