生物地球化学
硝酸盐
环境科学
生物地球化学循环
水生生态系统
环境化学
生态系统
氮气循环
铵
营养污染
污水
水生植物
水文学(农业)
氮气
生态学
污染
化学
环境工程
水生植物
生物
地质学
岩土工程
有机化学
作者
Haoran Guo,Yun Long Wu,Congcong Hu,Xue‐Yan Liu
摘要
Abstract Aquatic plants are the dominant biota in retaining nitrogen (N) pollutants discharged into river ecosystems, but the sensitivity of plant N pools and N assimilation to riverine N loadings, which is essential for evaluating river biogeochemistry and functions, remains poorly understood. Here, concentrations and stable isotopes of N in river water and aquatic plants were measured along the Nanming River in Guiyang of southwestern China. Total N (TN) contents of aquatic plants increased, but the increments decreased with river N concentrations. The δ 15 N of plant TN decreased with sewage N loadings along the river, which revealed a distinct shift of plant N preference from ammonium to nitrate. Higher levels of nitrate reductase activity in plants at the downstream river section supported the elevated nitrate preference and assimilation, which might explain the decreased nitrate concentrations observed in the river water of the downstream section. These findings contributed to understanding riverine N biogeochemical processes and their response to N loadings, which can help trace sewage N pollution and its ecological effects on river ecosystems.
科研通智能强力驱动
Strongly Powered by AbleSci AI