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首页> 外文期刊>Ecosystems >Basin-Scale Consequences of Agricultural Land Use on Benthic Light Availability and Primary Production Along a Sixth-Order Temperate River
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Basin-Scale Consequences of Agricultural Land Use on Benthic Light Availability and Primary Production Along a Sixth-Order Temperate River

机译：六阶温带河沿岸农业规模土地利用对底栖光能利用和初级生产的影响

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The emerging spatial scale of interest for fluvial ecosystem studies and applications is the river basin. Although much focus has been directed toward habitat availability and nutrient cycling across the fluvial landscape, light availability has received considerably less attention and has not been assessed quantitatively at the basin-scale despite it being the primary energy source for aquatic ecosystems. We developed a basin-scale light availability model that couples readily available broad spatial data with easily measured synoptic data using a GIS framework and the principles of hydraulic geometry. We used this model to (i) quantify benthic light availability (E bed) along a 160-km river in central Wisconsin, USA, (ii) predict gross primary production (GPP) along the same river, and (iii) assess the effects of agricultural land use on E bed and GPP. Overall, E bed decreased in the downstream direction due primarily to increased turbidity, and there was considerable local variation caused by changes in topography, riparian vegetation, and channel orientation. These local variations in E bed caused GPP to fluctuate greatly over short distances, as much as 2.1 g C mpo dp# over 260 m. When summed over the entire channel length, present-day, post-agricultural GPP (635 kg C dp#) was about eight times lower than estimated pre-agricultural GPP (4992 kg C dp#). Model simulations revealed that agricultural land use can cause an order of magnitude change in GPP, reduce or increase inter-sectional variability in GPP, and significantly alter broad spatial trends in GPP. Our basin-scale benthic light availability model is a tool that researchers can use to investigate relationships between light availability and ecosystem processes at broad spatial scales and also one that practitioners can use for more holistic fluvial ecosystem assessments.
机译：流域生态系统研究和应用领域正在兴起的新兴兴趣尺度是流域。尽管人们将注意力集中在整个河流景观上的栖息地可利用性和养分循环，但光可利用性虽然是水生生态系统的主要能源，但受到的关注却很少，而且在流域范围内也没有进行定量评估。我们开发了流域规模的光利用率模型，该模型使用GIS框架和水力几何原理将易于获得的广阔空间数据与易于测量的天气数据相结合。我们使用该模型来（i）量化美国威斯康星州中部160公里河流沿岸的底栖光能利用率（E床），（ii）预测同一河流沿岸的初级生产总值（GPP），以及（iii）评估其影响E床和GPP上的农业土地利用情况。总体而言，E床在下游方向上的下降主要是由于浊度增加，并且由于地形，河岸植被和河道方向的变化而引起了相当大的局部变化。 E床的这些局部变化导致GPP在短距离内波动很大，在260 m上高达2.1 g C mpo dp＃。当加总整个通道长度时，当今的农业后GPP（635 kg C dp＃）比估计的农业前GPP（4992 kg C dp＃）低八倍。模型仿真表明，农业土地利用会在GPP中引起数量级的变化，在GPP中减少或增加截面间的可变性，并显着改变GPP中广泛的空间趋势。我们的流域尺度底栖光能利用率模型是研究人员可以用来在广泛的空间尺度上研究光能利用率与生态系统过程之间关系的工具，也是从业人员可以用于更全面的河流生态系统评估的工具。

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