Plant absorption was not the main mechanism in reduction of both N and P, due to less plant biomass on wetland buffer zone.
缓冲带内的湿地植物量较小，决定了植物吸收并非氮磷去除的主要机制。
2
The results indicate that the nitrate-N leakage loss under the root zone caused by fertilizer irrigation could creat the pollution of shallow groundwater in Tangshan agricultural area.
计算结果表明，唐山农业区灌溉施肥引起根区以下硝态氮渗漏损失可造成浅层地下水的污染。
3
That announcement came yesterday, one week after the U. N. Security Council voted to enforce a no-fly zone over Libya.