申論題

2.Please translate the following paragraph into Chinese (25%)
 The nitrogen cycle has been radically changed by human activities. China consumes nearly one third of the world's nitrogen fertilizers. The excessive application of fertilizers and increased nitrogen discharge from livestock, domestic and industrial sources have resulted in pervasive water pollution. Quantifying a nitrogen 'boundary' in heterogeneous environments is important for the effective m management of local water quality. The amount of reactive nitrogen entering the global environment increased from around 15 megatonnes (Mt) in 1860 to 185 Mt in 2010, while agricultural use of nitrogen fertilizers increased from 12 Mt in 1961 to 110 Mt in 2014. Although it is a critical nutrient for crop yields and food production, human imputs of reactive nitrogen into terrestrial and freshwater ecosystems cause water pollution (for exampie nitrate, ammonium) and air pollution (ammonia, nitrogen oxides), as well as global warming and stratospheric ozone depletion (nitrous oxide). (Adapted from Nature, 2019)