Interpretation of anthropogenic impacts (agriculture and urbanization) on tropical deltaic river network through the spatio-temporal variation of stable (N, O) isotopes of NO−3*
Interpretation of anthropogenic impacts (agriculture and urbanization) on tropical deltaic river network through the spatio-temporal variation of stable (N, O) isotopes of NO−3*
复制标题
通过NO−3稳定（N、O）同位素的时空变化解释人类活动（农业和城市化）对热带三角洲河网的影响*
DOI：
10.1080/10256016.2016.1142987
复制
发表时间：
2016
影响因子：
1.3
通讯作者：
A. Trinh
中科院分区：
文献类型：
--
作者：
T. T. Ta;S. Le;Hong Quan Trinh;Thi;A. Trinh
双同位素方法首次被应用于追踪影响的来源，并确定在热带三角洲地区的红河（越南）的河流网络的地球化学过程的管理。我们的长期调查得出的结论是，该河流网络中的水受到人类活动的严重影响。分析显示，硝酸盐同位素的时空变化很大，δ 15 N-和δ 18 O-的范围分别为−5至15 ‰和−10至10 ‰。 在旱季施肥时，δ 15 N-和δ 18 O-的平均值分别为3.54和3.15 ‰。 在雨季，该值分别变为6.41和-2.23 ‰。 反硝化作用和生物同化作用全年活跃，但在施肥期间特别增强。国内有机质的矿化和随之而来的硝化作用的矿化是占主导地位的过程，特别是在雨季。
ABSTRACT For the first time, the dual isotope approach was applied to trace the sources of impacts and to identify the governing biogeochemical processes in a river network in the tropical deltaic region of the Red River (Vietnam). Our long term surveys concluded that water in this river network was severely impacted by anthropogenic activities. Analysis has shown strong spatio-temporal variation of nitrate isotopes; ranges of δ15N– and δ18O– were from −5 to 15 ‰ and from −10 to 10 ‰, respectively. Average values of δ15N– and δ18O– in the dry season, when fertilizer is applied, were 3.54 and 3.15 ‰, respectively. In the rainy season, the values changed to 6.41 and −2.23 ‰, respectively. Denitrification and biological assimilation were active throughout the year, but were especially enhanced during fertilization time. Mineralization of domestic organic matter and consequent nitrification of mineralized were the dominant processes, particularly during the rainy period.