牛的入口点对河流浊度时间变化的影响

IF 0.9 4区 农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY Irish Journal of Agricultural and Food Research Pub Date : 2023-01-01 DOI:10.15212/ijafr-2022-0109
M. Oneill, C. Briciu-Burghina, E. Jennings, P. Antunes, D. Ó hUallacháin, M. Kelly-Quinn, M. O'Sullivan, F. Regan
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引用次数: 0

摘要

不受限制的养牛通道可能对水生系统产生负面影响,包括增加溪流浑浊度和悬浮沉积物水平。许多农业环境政策要求将牲畜排除在水体之外;然而,量化这些影响的数据很少。这项研究使用了测量浊度(悬浮沉积物的代表)的传感器,以及运动探测摄像机,来检查爱尔兰东北部河流中牛群的活动对水质的影响。2017年7月,在牛群接入点的上游和下游放置了两台自动测量和记录浊度的浊度计,同时使用摄像机记录牛群的行为。2018年2月,在没有牛的情况下进行了第二次部署。在低流量期间,仅在下游浊度计处记录到频繁的短暂浊度增加。与此同时,牛群也在取水。浑浊度的纵向差异(下游-上游)与进入河流的牛总数呈显著正相关。在7月(有牛的时候),浑浊度与河流流量没有关系,尽管这段时间以较低的流量为主,只有2天的流量高于基本流量。相比之下,2018年2月,当牛不在现场时,浑浊度没有类似的短期增加,但水流流量与浑浊度之间存在强烈的显著正相关关系。这些结果突出了牛进入水柱浊度水平的后果,特别是在低流量期间,因此为爱尔兰未来的农业环境政策提供了信息。
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Influence of a cattle access point on temporal changes in stream turbidity
Unrestricted cattle access can have negative impacts on aquatic systems, including increases in stream water turbidity and suspended sediment levels. Many agri-environmental policies require the exclusion of livestock from waterbodies; however, data that quantify these impacts are scarce. This study used sensors measuring turbidity, a proxy for suspended sediment, together with motion-detecting cameras, to examine the influence of cattle in-stream activity on water quality in north-east Ireland. Two nephelometers, which automatically measured and logged turbidity, were placed upstream and downstream of a cattle access point in July 2017, while cameras were used to record cattle behaviour. A second deployment was made during February 2018 when cattle were absent. During low flows, frequent short-lived increases in turbidity were recorded at the downstream nephelometer only. These coincided with cattle accessing the water. There was a significant positive relationship between the longitudinal differences (downstream − upstream) in turbidity and the total number of cattle accessing the stream. There was no relationship between turbidity and stream discharge in July (when cattle were present), although that period was dominated by lower flow levels, with only 2 days in which discharge increased above baseflow. In contrast, there were no similar short-lived increases in turbidity in February 2018 when cattle were absent from the field, but there was a strong significant positive relationship between stream discharge and turbidity. These results highlight the consequences of cattle access for water column turbidity levels, particularly during periods of low streamflow, and therefore inform future agri-environmental policy in Ireland.
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来源期刊
CiteScore
2.50
自引率
20.00%
发文量
23
审稿时长
>36 weeks
期刊介绍: The Irish Journal of Agricultural and Food Research is a peer reviewed open access scientific journal published by Teagasc (Agriculture and Food Development Authority, Ireland). Manuscripts on any aspect of research of direct relevance to Irish agriculture and food production, including plant and animal sciences, food science, agri environmental science, soils, engineering, buildings, economics and sociology, will be considered for publication. The work must demonstrate novelty and relevance to the field of research. Papers published or offered for publication elsewhere will not be considered, but the publication of an abstract does not preclude the publication of the full paper in this journal.
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