Using isotopes to understand landscape‐scale connectivity in a groundwater‐dominated, lowland catchment under drought conditions,Hydrological Processes

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Using isotopes to understand landscape‐scale connectivity in a groundwater‐dominated, lowland catchment under drought conditions
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-04-29 , DOI: 10.1002/hyp.14197
Lukas Kleine _{1,

2} , Doerthe Tetzlaff _{1,

2,

3} , Aaron Smith ₂ , Tobias Goldhammer ₂ , Chris Soulsby _{2,

3}

Affiliation

The Demnitzer Millcreek catchment (DMC), is a 66 km² long‐term experimental catchment located 50 km SE of Berlin. Monitoring over the past 30 years has focused on hydrological and biogeochemical changes associated with de‐intensification of farming and riparian restoration in the low‐lying landscape dominated by rain‐fed farming and forestry. However, the hydrological function of the catchment, which is closely linked to nutrient fluxes and highly sensitive to climatic variability, is still poorly understood. In the last 3 years, a prolonged drought period with below‐average rainfall and above‐average temperatures has resulted in marked hydrological change. This caused low soil moisture storage in the growing season, agricultural yield losses, reduced groundwater recharge, and intermittent streamflows in parts of an increasingly disconnected channel network. This paper focuses on a two‐year long isotope study that sought to understand how different parts of the catchment affect ecohydrological partitioning, hydrological connectivity and streamflow generation during drought conditions. The work has shown the critical importance of groundwater storage in sustaining flows, basic in‐stream ecosystem services and the dominant influence of vegetation on groundwater recharge. Recharge was much lower and occurred during a shorter window of time in winter under forests compared to grasslands. Conversely, groundwater recharge was locally enhanced by the restoration of riparian wetlands and storage‐dependent water losses from the stream to the subsurface. The isotopic variability displayed complex emerging spatio‐temporal patterns of stream connectivity and flow duration during droughts that may have implications for in‐stream solute transport and future ecohydrological interactions between landscapes and riverscapes. Given climate projections for drier and warmer summers, reduced and increasingly intermittent streamflows are very likely not just in the study region, but in similar lowland areas across Europe. An integrated land and water management strategy will be essential to sustaining catchment ecosystem services in such catchment systems in future.

中文翻译：

利用同位素了解干旱条件下以地下水为主的低地流域的景观尺度连通性

Demnitzer Millcreek集水区（DMC）是66 km ²长期实验流域位于柏林东南50公里处。在过去的30年中，监测工作集中在与低强度农业相关的水文和生物地球化学变化以及在雨养农业和林业占主导地位的低地景观中。但是，流域的水文功能与养分通量密切相关，并且对气候变化高度敏感，对此知之甚少。在过去的三年中，干旱时间延长，降雨低于平均水平，气温高于平均水平，导致水文状况发生明显变化。这导致了生长季节土壤水分的低储量，农业产量的损失，地下水补给的减少以及不断断开的渠道网络中部分地区的间歇性水流。本文着重进行了为期两年的同位素研究，旨在了解流域的不同部分如何在干旱条件下影响生态水文分配，水文连通性和水流产生。这项工作表明了地下水储存在维持水流，基本河内生态系统服务以及植被对地下水补给的主要影响中至关重要。与草原相比，森林中的补给量要低得多，并且发生在冬季森林较短的时间范围内。相反，河岸湿地的恢复和从水流到地下的依赖于存储的水损失使地下水的局部补给得到了增强。同位素变异性显示干旱期间河流连通性和水流持续时间的复杂时空格局，可能对河流溶质运移以及景观与河流景观之间未来的水文相互作用产生影响。鉴于夏季干燥和炎热的气候预测，不仅在研究区域，而且在欧洲类似的低地地区，流量减少和断断续续的可能性很大。土地和水综合管理战略对于将来在此类集水系统中维持集水生态系统服务至关重要。不仅在研究区域，而且在整个欧洲类似的低地地区，流量减少和断断续续的可能性都很大。土地和水综合管理战略对于将来在此类集水系统中维持集水生态系统服务至关重要。不仅在研究区域，而且在整个欧洲类似的低地地区，流量减少和断断续续的可能性都很大。土地和水综合管理战略对于将来在此类集水系统中维持集水生态系统服务至关重要。

更新日期：2021-05-14

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