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Influence of the hydrologic regime on resource availability in a semi-arid stream-riparian corridor

机译：半干旱河岸带水文状况对资源可利用性的影响

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The hydrologic regime of an ecosystem directly affects ecological processes by controlling water availability, but may also have indirect effects by influencing resource availability. To clarify interactions between the hydrologic regime and resource availability, we quantified the timescales over which precipitation and discharge correlated with abundance of dissolved carbon, nitrogen, and phosphorus in the stream-riparian corridor of the San Pedro River, a large desert river. We hypothesized that the hydrologic regime drives regimes of resource availability during flushing events caused by variation in source areas of run-off generation. We also hypothesized that seasonal droughts may result in accumulation of resources within the catchment. Such accumulations would contribute to high solute concentrations in receiving waters following dry periods. To test these hypotheses, we compiled seasonal datasets over 4-6 years and used regression analyses to determine the temporal extents at which solute concentrations and transformations were correlated with precipitation and stream discharge. Concentrations of most biologically reactive solutes were unrelated to precipitation or discharge, suggesting overlapping influences of myriad biological and transport processes probably operating on event or shorter timescales. Concentration of phosphate [soluble reactive phosphate (SRP)], NO_3~-: SRP, and NO_3~-: NH_4~+ in the stream were positively correlated with precipitation abundance over weeks and up to 2 months, supporting the flushing hypothesis. Microbial processes in floodplain soils responded to precipitation and discharge, suggesting that biological processes may mediate relationships between hydrology and resource availability. In this large, semi-arid catchment, resource availability is linked to hydrology via hydrologic transport, flowpath characteristics, and biotic processing.
机译：生态系统的水文状况通过控制水的可利用性直接影响生态过程，但也可能通过影响资源可利用性而产生间接影响。为了阐明水文状况与资源可获得性之间的相互作用，我们量化了一条时间表，在该时间表上，一条大沙漠河圣佩德罗河的河岸走廊的降水和流量与溶解的碳，氮和磷的含量相关。我们假设在冲水事件中，由径流产生源区域的变化引起的，水文体制驱动着资源的利用。我们还假设季节性干旱可能导致流域内资源的积累。这种积累将导致干燥期后接收水中的高溶质浓度。为了检验这些假设，我们收集了4-6年的季节性数据集，并使用回归分析来确定溶质浓度和转化与降水和溪流排放相关的时间范围。大多数具有生物活性的溶质的浓度与沉淀或排放无关，表明可能在事件或更短的时间尺度上运行的无数生物学和运输过程的重叠影响。溪流中的磷酸盐[可溶性反应性磷酸盐（SRP）]，NO_3〜-:: SRP和NO_3〜-:: NH_4〜+的浓度与长达数周甚至长达2个月的降水量呈正相关，支持了冲洗假设。洪泛区土壤中的微生物过程对降水和流量产生响应，表明生物过程可能介导水文学与资源可利用性之间的关系。在这个大的半干旱流域，资源的可用性通过水文运输，流径特征和生物加工与水文学联系在一起。

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