从景观特征看北温带湖泊浮游植物生物量的多年代际变化,Global Change Biology

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从景观特征看北温带湖泊浮游植物生物量的多年代际变化
Global Change Biology ( IF 10.8 ) Pub Date : 2022-01-11 , DOI: 10.1111/gcb.16079
Aleksey Paltsev ₁ , Irena F Creed _{1,

2}

Affiliation

生态学家共同预测，气候变化将增加北部湖泊的浮游植物生物量。然而，湖泊的结构和调节功能存在独特的变化，使这一预测具有挑战性，甚至可能是不准确的。我们使用存档的 Landsat TM/ETM+ 卫星产品来估计外浸叶绿素- a ( Chl- a) 浓度作为 28 年来 281 个北部温带湖泊中浮游植物生物量的代表。我们探讨了气候（气温、降水）和景观替代物对养分来源（贡献集水区中湿地的比例、沿海地区的大小、由动态比率估计的风驱动沉积物再悬浮的潜力）或养分汇的影响（湖体积）在随机森林模型中解释叶绿素峰值的异质性。具有较高 Chla - a（中值 Chla - a = 2.4 μg L ^-1，n = 40）的湖泊体积较小（<44 × 10 ⁴ m ³）并且对温度升高更敏感。相比之下，氯含量较低的湖泊a（中值 Chla - a = 0.6 μg L ^-1，n = 241）具有较大的体积（≥44 × 10 ⁴ m ³），贡献的流域湿地比例较小（<流域面积的 4.5%，n = 70），较小的沿海地区（<16.4 公顷，n = 137），最小的风驱动沉积物再悬浮（由动态比率定义；<0.45，n = 232），并且对降水的增加更敏感。体积较大的湖泊通常对气候因素的反应较小；然而，具有大量湿地和较大滨海带的较大体积湖泊的行为与体积较小的湖泊相似。我们发现具有不同景观特性的湖泊对气候因素的反应不同，这可能有助于预测湖泊在不断变化的气候条件下对富营养化的敏感性。

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Multi‐decadal changes in phytoplankton biomass in northern temperate lakes as seen through the prism of landscape properties

Ecologists collectively predict that climate change will enhance phytoplankton biomass in northern lakes. Yet there are unique variations in the structures and regulating functions of lakes to make this prediction challengeable and, perhaps, inaccurate. We used archived Landsat TM/ETM+ satellite products to estimate epilimnetic chlorophyll-a (Chl-a) concentration as a proxy for phytoplankton biomass in 281 northern temperate lakes over 28 years. We explored the influence of climate (air temperature, precipitation) and landscape proxies for nutrient sources (proportion of wetlands in a contributing catchment, size of the littoral zone, potential for wind-driven sediment resuspension as estimated by the dynamic ratio) or nutrient sinks (lake volume) in a random forest model to explain heterogeneity in peak Chl-a. Lakes with higher Chl-a (median Chl-a = 2.4 μg L⁻¹, n = 40) had smaller volumes (<44 × 10⁴ m³) and were more sensitive to increases in temperature. In contrast, lakes with lower Chl-a (median Chl-a = 0.6 μg L⁻¹, n = 241) had larger volumes (≥44 × 10⁴ m³), contributing catchments with smaller proportions of wetlands (<4.5% of catchment area, n = 70), smaller littoral zones (<16.4 ha, n = 137), minimal wind-driven sediment resuspension (as defined by the dynamic ratio; <0.45, n = 232), and were more sensitive to increases in precipitation. Lakes with larger volumes were generally less responsive to climate factors; however, larger volume lakes with a significant proportion of wetlands and larger littoral zones behaved similarly to lakes with smaller volumes. Our finding that lakes with different landscape properties respond differently to climate factors may help predict the susceptibility of lakes to eutrophication under changing climatic conditions.

更新日期：2022-01-11

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