Stable isotopes as an effective tool for N nutrient source identification in a heavily urbanized and agriculturally intensive tropical lowland basin
Stable isotopes as an effective tool for N nutrient source identification in a heavily urbanized and agriculturally intensive tropical lowland basin
复制标题
稳定同位素作为高度城市化和农业密集型热带低地盆地氮营养源识别的有效工具
DOI：
10.1007/s10533-020-00663-w
复制
发表时间：
2020
期刊：
影响因子：
4
通讯作者：
Luu T
中科院分区：
文献类型：
--
作者：
Luu T
我们提出的应用NO3（δ 15 N-NO3和δ 18 O-NO3）的双稳定同位素分析提供了一个全面的评估的来源，分区，和转换的硝酸盐横跨日河流域（DRB），越南，这是严重影响农业和城市化。在DRB的12个地点采集了河水的稳定同位素组成δ 18 O-H2O，以及δ 15 N-NO3和δ 18 O-NO3。在三个不同时期进行了样本采集，以捕捉区域天气和农业施肥制度的变化; 4月（旱季和关键施肥期），7月（雨季和另一个关键施肥期）和10月（雨季，没有区域施肥）。NO3稳定同位素δ 18 O和δ 15 N的范围分别为− 7.1 ~+ 9.2‰和− 3.9 ~+ 13.2‰。通过对稳定同位素数据的解释，确定了DRB中NO3的4个主要来源：（1）来自密集农业灌溉网络的硝化尿素肥料，（2）流域内的土壤和地下水沥滤，（3）粪便和污水输入（在下游河段更为普遍），以及（4）来自红河的上游流入，通过Dao河排入Day河。我们应用混合模型的DRB组成的4个变量，代表这4个不同的来源。分区计算表明，在7月施肥和多雨期间，河流NO3中45%以上来自硝化尿素源。在其他采样期间（4月和10月），粪便和污水贡献了50%以上的河流NO3，来自DRB的中部，其中日河接收来自越南首都河内的生活污水。O和N的稳定同位素数据表明，硝化过程是更普遍的雨季比旱季，这主要发生在稻田农业区。在一般情况下，数据表明，硝酸盐损失的DRB是由于反硝化发生在污染的河段，并在旱季占主导地位。这项研究强调，（一）生活垃圾应在排入日河之前进行处理，（二）需要更好的集水区农业施肥方法，因为目前大部分肥料排入河流，这极大地影响了区域水质。
We present the application of dual stable isotope analyses of NO3(δ15N-NO3and δ18O-NO3) to provide a comprehensive assessment of the provenance, partitioning, and conversion of nitrate across the Day River Basin (DRB), Vietnam, which is heavily impacted by agriculture and urbanization. Stable isotope compositions of river water δ18O-H2O, in addition to their δ15N-NO3and δ18O-NO3signatures, were sampled at 12 locations in the DRB. Sample collection was conducted during three different periods to capture changes in regional weather and agricultural fertilization regimes; April (the dry season and key fertilization period), July (the rainy season and another key fertilization period) and October (the rainy season with no regional fertilization). Ranges of NO3stable isotopes are − 7.1 to + 9.2‰ and − 3.9 to + 13.2‰ for δ18O and δ15N, respectively. Interpretation of the stable isotope data characterizes 4 main sources of NO3in the DRB; (1) nitrified urea fertilizer derived from an intensive agricultural irrigation network, (2) soil and groundwater leaching from within the basin (3) manure and sewage inputs (which is more prevalent in downstream river sections) and (4) upstream inflow from the Red River which discharges into the Day River through the Dao River. We applied a mixing model for the DRB consisting of 4 variables, representing these 4 different sources. The partition calculation shows that during the fertilization and rainy period of July, more than 45% of river NO3is derived from nitrified urea sources. During the other sampling periods (April and October), manure and sewage contribute more than 50% of river NO3and are derived from the middle portion of the DRB, where the Day River receives domestic wastewater from the Vietnamese capital, Hanoi. Stable isotope data of O and N reveal that nitrification processes are more prevalent in the rainy season than in dry season and that this predominantly takes place in paddy field agricultural zones. In general, data demonstrate that nitrate loss in the DRB is due to denitrification which takes place in polluted stretches of the river and dominates in the dry season. This study highlights that (i) domestic waste should be treated prior to its discharge into the Day River and (ii) the need for better catchment agricultural fertilization practices as large portions of fertilizer currently discharge into the river, which greatly impacts regional water quality.
登录
查看更多内容
影响因子：
1.8
作者：
K. Kurosawa;Do Nguyen Hai;N. Huu Thanh;Ho Thi Lam Tra;Tran Thi Le Ha;Nguyen Tat Canh;K. Egashira
通讯作者：
K. Kurosawa;Do Nguyen Hai;N. Huu Thanh;Ho Thi Lam Tra;Tran Thi Le Ha;Nguyen Tat Canh;K. Egashira
稻田水环境中溶解氮化合物稳定同位素值的时间变化
DOI：
10.53747/jnst.v9i3.44
发表时间：
2019
期刊：
Nuclear Science and Technology
影响因子：
--
作者：
M. Saiki;T. Do;Thuy Hai Cao Thi;Takashi Nakamura;Thao Ta Thi;K. Nishida
通讯作者：
K. Nishida
人为对越南 Nhue 和 Day 河流系统地表水质的影响
影响因子：
4.2
作者：
P. Hanh;S. Sthiannopkao;Kyoung;D. Ba;Nguyen Quang Hung
通讯作者：
Nguyen Quang Hung
通过物质流分析量化越南调节河流系统中的氮负荷
影响因子：
3.1
作者：
T. Do;Viet;A. Trinh;K. Nishida
通讯作者：
K. Nishida
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*
影响因子：
1.3
作者：
T. T. Ta;S. Le;Hong Quan Trinh;Thi;A. Trinh
通讯作者：
A. Trinh