Processes and mechanisms controlling nitrate dynamics in an artificially drained field: Insights from high-frequency water quality measurements
Processes and mechanisms controlling nitrate dynamics in an artificially drained field: Insights from high-frequency water quality measurements
复制标题
控制人工排水场中硝酸盐动态的过程和机制：高频水质测量的见解
DOI：
10.1016/j.agwat.2020.106032
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发表时间：
2020
影响因子：
6.7
通讯作者：
B. Maxwell
中科院分区：
文献类型：
--
作者：
Wenlong Liu;M. Youssef;F. Birgand;G. Chescheir;S. Tian;B. Maxwell
密集的农业活动，特别是在人工排水的农业景观中，产生了大量的营养素输出，这已被确定为水质损害的主要原因。已经制定了若干管理做法，并在农业流域实施，以减少营养物的输出，例如硝酸盐氮。虽然已发表的研究报告相当多的水质效益，这些做法，存在着许多悬而未决的问题，内在的过程和机制，控制硝酸盐的命运和运输排水农业景观。为了进一步了解过程和机制，我们部署了两个高频采样系统在排水农田调查农业排水和硝酸盐浓度之间的关系（C-Q关系）。结果表明，高频测量系统能够捕捉到实验现场快速变化的C-Q关系，例如滞后模式。22个确定的风暴事件表现出逆时针方向的行为与高变异性的冲洗/稀释效果。此外，高排水流量比低流量贡献了更多的硝酸盐负荷。例如，在监测期间，排水流量的前10%通过地下排水输出了超过50%的硝酸盐损失。此外，我们观察到动物粪便施用是通过增加土壤氮库规模来改变C-Q关系的最有影响力的做法。从高频水质测量中获得的见解可以帮助提供有关保护实践的设计和管理的实用建议，如控制排水，生物反应器和饱和缓冲区，以提高其脱氮效率。这随后导致更好地管理排水农田的养分。
Intensive agricultural activities, especially in artificially drained agricultural landscapes, generate a considerable amount of nutrient export, which has been identified as a primary cause of water quality impairment. Several management practices have been developed and installed in agricultural watersheds to reduce nutrient export, e.g. nitrate-nitrogen (NO3-N). Although published research reported considerable water quality benefits of these practices, there exist many unanswered questions regarding the inherent processes and mechanisms that control nitrate fate and transport from drained agricultural landscape. To advance our understanding of processes and mechanisms, we deployed two high-frequency sampling systems in a drained agricultural field to investigate the relationship between agricultural drainage and nitrate concentrations (C-Q relationship). Results indicated that the high-frequency measuring system was able to capture the rapidly changing C-Q relationships at the experimental site, e.g. hysteresis patterns. The 22 identified storm events exhibited anti-clockwise behavior with high variability of flushing/dilution effects. In addition, high drainage flows contributed far more nitrate loading compared with lower flows. For instance, the top 10 % of drainage flow exported more than 50 % of the nitrate lost via subsurface drainage during the monitoring period. Additionally, we observed that animal waste application was the most influential practice to change the C-Q relationship by increasing the size of soil nitrogen pools. The insights obtained from the high-frequency water quality measurements could help provide practical suggestions regarding the design and management of conservation practices, such as controlled drainage, bioreactors, and saturated buffers, to improve their nitrogen removal efficiencies. This subsequently leads to better nutrient management in drained agricultural lands.
使用高频数据通过基于数据的机械模型预测风暴转移和年度负荷
影响因子：
6.3
作者：
Ockenden M
通讯作者：
Ockenden M
影响因子：
11.4
作者：
Rode, Michael;Wade, Andrew J.;Jomaa, Seifeddine
通讯作者：
Jomaa, Seifeddine
影响因子：
9.8
作者：
Bowes, M. J.;Jarvie, H. P.;Palmer-Felgate, E. J.
通讯作者：
Palmer-Felgate, E. J.