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首页> 外文期刊>Journal of the American Water Resources Association >SPATIAL VARIATION OF NUTRIENT BALANCE IN THE TRUCKEE RIVER, CALIFORNIA-NEVADA
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SPATIAL VARIATION OF NUTRIENT BALANCE IN THE TRUCKEE RIVER, CALIFORNIA-NEVADA

机译：内华达州加利福尼亚州水上河流营养平衡的空间变化

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摘要

Because the Truckee River connects two lakes along the Eastern Sierra Nevada Mountains with different limiting nutrients, this research addresses whether the nitrogen:phosphorus (N:P) balance of the river ecosystem changes longitudinally. Historical (1990 to 2000) total nitro-gen:total phosphorus (TN:TP) ratios in river water exhibited the expected gradient from high N:P ratios upstream to low N:P ratios downstream, with the major gradient of the N:P balance occurring within the transition between montane and high desert terrain. During 2001, the river contained anomalously low total nitrogen concentrations in the far upper reaches and dissolved inorganic nitrogen concentrations in the lower reaches, resulting in a less apparent longitudinal gradient of N:P ratios. Measurements of periphyton growth and physiology (nutrient bioassays and ectoenzyme activities) and stoichiome-try during the summer of 2001 also exhibited a complex picture of the spatial variation of N:P balance that was not entirely consistent with a strong N:P gradient. However, the compendium of the indicators did support the overall picture of an overarching longitudinal gradient from high to low N:P ratios. The results suggest that periphyton management efforts in the Truckee River should consider the overall spatial gradient as well as the small-scale dynamics of the stream ecosystem structure.
机译：由于特拉基河将内华达山脉东部的两个湖泊连接在一起，限制了养分的含量不同，因此本研究探讨了河流生态系统中氮磷平衡的纵向变化。历史（1990年至2000年）河水中的总氮：总磷（TN：TP）比显示出预期的梯度，从上游的高N：P比率到下游的低N：P比率，其中N：P的主要梯度平衡发生在山地和沙漠高地之间的过渡。在2001年期间，这条河流的上游总氮浓度异常偏低，而下游则含有溶解的无机氮浓度，从而导致N：P比的纵向梯度减小。在2001年夏季对周生植物生长和生理学（营养生物测定和外部酶活性）和化学计量学的测量也显示出N：P平衡的空间变化的复杂图景，但并不完全与强N：P梯度一致。但是，指标汇编确实支持了从高到低的N：P比率的总体纵向梯度的总体情况。结果表明，特拉基河的围生植物管理工作应考虑总体空间梯度以及河流生态系统结构的小规模动态。

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