Phenology of gross primary productivity in rivers displays high variability within years but stability across years

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Nicholas S. Marzolf, Michael J. Vlah, Heili E. Lowman, Weston M. Slaughter, Emily S. Bernhardt
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Abstract

Modeling and sensor innovations in the last decade have enabled routine and continuous estimation of daily gross primary productivity (GPP) for rivers. Here, we generate and evaluate within and across year variability for 59 US rivers for which we have compiled a 14-yr time series of daily GPP estimates. River productivity varied widely across (median annual GPP 462 g C m−2 yr−1, range 19–3445 g C m−2 yr−1) and within rivers (CVGPP-Inter 5.7–37.3%). Within this dataset, we found that five rivers have become consistently more productive over time, while 11 rivers have become consistently less productive. Furthermore, trends in ecosystem phenology were identified, where cumulative annual GPP was reached earlier (n = 3) and later (n = 13) in the year across the 25th, 50th, 75th, and 95th percentiles. Understanding the drivers of productivity trends in rivers will elucidate patterns in river food webs and the functional role of river biogeochemistry.

Abstract Image

河流总初级生产力的物候学显示出年内的高变异性和跨年的稳定性
过去十年中,建模和传感器的创新使我们能够对河流的每日总初级生产力(GPP)进行常规、连续的估算。在此,我们生成并评估了美国 59 条河流的年内和跨年变异性,并对其进行了 14 年的每日总初级生产力估算时间序列。不同河流之间(年 GPP 中位数为 462 g C m-2 yr-1,范围为 19-3445 g C m-2 yr-1)和河流内部(CVGPP-Inter 5.7-37.3%)的河流生产力差异很大。在该数据集中,我们发现随着时间的推移,5 条河流的生产力持续提高,而 11 条河流的生产力持续降低。此外,我们还发现了生态系统物候学的趋势,在第 25、50、75 和 95 百分位数中,年累积总生产力在一年中达到的时间有早(3 条)和晚(13 条)之分。了解河流生产力趋势的驱动因素将有助于阐明河流食物网的模式以及河流生物地球化学的功能作用。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
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.
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