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引用次数: 0
摘要
总初级生产量(GPP)和生态系统呼吸作用(ER)的时间结构因动态驱动因素(如流量、光照、温度、有机物供应)之间复杂的相互作用而在不同时间尺度上有所不同。为了探索河流新陈代谢变化的新模式,我们对美国 87 条河流的多年新陈代谢记录进行了频域分析。我们观察到新陈代谢的变化主要具有年度周期性,而在亚年度频率上则具有普遍的分形比例(即功率谱密度与频率成反比),这表明这些是河流新陈代谢机制的基本时间结构。河流新陈代谢的频域模式与能量输入相关的驱动因素最为吻合:底栖光对 GPP 的影响和 GPP 对 ER 的影响。简单的河流新陈代谢模型在使用适当的能量输入参数但忽略温度控制时,也能捕捉到频域模式。这些结果表明,能量供应的时间变化直接影响新陈代谢信号,而频域模式为预测河流新陈代谢机制提供了基准属性。
Energy inputs imprint seasonality and fractal structure on river metabolic regimes
The temporal structures of gross primary production (GPP) and ecosystem respiration (ER) vary across time scales in response to complex interactions among dynamic drivers (e.g., flow, light, temperature, organic matter supply). To explore emergent patterns of river metabolic variation, we applied frequency-domain analysis to multiyear records of metabolism across 87 US rivers. We observed a dominant annual periodicity in metabolic variation and universal fractal scaling (i.e., power spectral density inversely correlated with frequency) at subannual frequencies, suggesting these are foundational temporal structures of river metabolic regimes. Frequency-domain patterns of river metabolism aligned best with drivers related to energy inputs: benthic light for GPP and GPP for ER. Simple river metabolism models captured frequency-domain patterns when parameterized with appropriate energy inputs but neglecting temperature controls. These results imply that temporal variation of energy supply imprints directly on metabolic signals and that frequency-domain patterns provide benchmark properties to predict river metabolic regimes.
期刊介绍:
Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.