Assessing land use influences on isotopic variability and stream water ages in urbanising rural catchments

IF 1.1 4区 环境科学与生态学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Isotopes in Environmental and Health Studies Pub Date : 2022-05-04 DOI:10.1080/10256016.2022.2070615
Jamie Lee Stevenson, J. Geris, C. Birkel, D. Tetzlaff, C. Soulsby
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引用次数: 5

Abstract

ABSTRACT Stable water isotopes are invaluable in helping understand catchment functioning and are widely used in experimental catchments, with higher frequency data becoming increasingly common. Such datasets incur substantial logistical costs, reducing their feasibility for use by decision makers needing to understand multi-catchment, landscape-scale functioning over a relatively short period to assess the impact of proposed land use change. Instead, reconnaissance style surveys (high spatial resolution across the landscape at a lower temporal frequency, over a relatively short period) offer an alternative, complementary approach. To test if such sampling could identify heterogeneities in hydrological functioning, and associated landscape controls, we sampled 27 stream sites fortnightly for one year within a peri-urban landscape undergoing land use change. Visual examination of raw data and application of mean transit time and young water fraction models indicated urbanisation, agriculture and responsive soils caused more rapid cycling of precipitation to stream water, whereas mature forestry provided attenuation. We were also able to identify contiguous catchments which functioned fundamentally differently, meaning their response to land use alteration would also be different. This study demonstrated how stable water isotopes can be a valuable, low-cost addition to tools available for environmental decision makers by providing local, process-based information.
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评估土地利用对城市化农村集水区同位素变率和河流年龄的影响
稳定水同位素在帮助了解流域功能方面具有不可估量的价值,并且在实验流域中得到广泛应用,高频数据变得越来越普遍。这些数据集产生了大量的物流成本,降低了决策者使用这些数据集的可行性,因为决策者需要在相对较短的时间内了解多流域、景观尺度的功能,以评估拟议的土地利用变化的影响。相反,侦察式调查(在相对较短的时间内,以较低的时间频率在整个景观中实现高空间分辨率)提供了一种替代的补充方法。为了测试这种采样是否可以识别水文功能的异质性,以及相关的景观控制,我们在经历土地利用变化的城郊景观中每两周采样27个河流站点,持续一年。对原始数据的目视检查以及平均传输时间和年轻水组分模型的应用表明,城市化、农业和响应性土壤导致降水到水流的更快循环,而成熟的林业则提供了衰减。我们还能够识别出功能根本不同的连续集水区,这意味着它们对土地利用改变的反应也会不同。这项研究表明,稳定的水同位素可以通过提供当地的、基于过程的信息,成为环境决策者可用工具的一种有价值的、低成本的补充。
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来源期刊
CiteScore
2.80
自引率
7.70%
发文量
21
审稿时长
3.0 months
期刊介绍: Isotopes in Environmental and Health Studies provides a unique platform for stable isotope studies in geological and life sciences, with emphasis on ecology. The international journal publishes original research papers, review articles, short communications, and book reviews relating to the following topics: -variations in natural isotope abundance (isotope ecology, isotope biochemistry, isotope hydrology, isotope geology) -stable isotope tracer techniques to follow the fate of certain substances in soil, water, plants, animals and in the human body -isotope effects and tracer theory linked with mathematical modelling -isotope measurement methods and equipment with respect to environmental and health research -diagnostic stable isotope application in medicine and in health studies -environmental sources of ionizing radiation and its effects on all living matter
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