Abstract We aimed to demonstrate different input of organic and inorganic carbon, nitrogen and phosphorus from three main groups of primary producers (phytoplankton, charophytes and vascular submerged macrophytes) to respective lake sediments. Studies were carried out in one eutrophic and two mesotrophic lakes. Samples of sediments were taken from profundal and from littoral zones, the latter divided into such overgrown by charophytes and others covered by vascular submerged macrophytes. We applied a stoichiometric approach to illustrate variable functional carbon to nutrients relationships. Among profundal sediments, the lowest organic to inorganic carbon ratio was found in sediments from the eutrophic lake due to precipitation of calcium carbonate during algal blooms. Extremely low inorganic carbon input to profundal sediment of one of the mesotrophic lakes may be explained by low phytoplankton production but also by dissolution of once deposited calcium carbonates. Charophyte-dominated littoral sediments contained significantly more inorganic carbon than other littoral and profundal sediments. Comparison of stoichiometric ratios between plant standing crop and underlying littoral sediments showed significant enrichment of sediments in nitrogen manifested by reduction of organic carbon to total nitrogen ratio during plant decomposition taking place both in charophyte and in vascular plant stands. We also attempted to divide phosphorus pool in sediments into organic P and calcium-bound P present in charophyte stands and in profundal sediments of eutrophic lake. In the former, calcium-bound P was estimated at 17–19% of the total P pool while in profundal sediments it amounted 42% of the total P. This difference suggests that calcium carbonate settling during algal blooms in a eutrophic lake may be more effective in P trapping than calcite encrustations covering charophyte plants in littoral sites. In conclusions, we underline the need of considering often neglected inorganic fractions of carbon and phosphorus to get better insight into carbon and nutrient burial in lake sediments.

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碳和养分从初级生产者转移到湖泊沉积物——一种化学计量方法

摘要 我们旨在展示从三个主要初级生产者群（浮游植物、轮藻和维管沉水植物）到各自湖泊沉积物的有机和无机碳、氮和磷的不同输入。研究是在一个富营养化湖泊和两个中营养化湖泊中进行的。沉积物样本取自深海区和沿海区，后者分为被轮藻和其他被血管淹没的大型植物覆盖的杂草。我们应用化学计量方法来说明可变功能碳与营养素的关系。在深层沉积物中，由于藻华期间碳酸钙的沉淀，富营养化湖泊的沉积物中发现有机碳与无机碳的比率最低。中营养湖泊之一的深层沉积物中无机碳输入极低，这可能是由于浮游植物产量低，也可能是由于曾经沉积的碳酸钙的溶解。轮藻占主导地位的沿海沉积物比其他沿海和深海沉积物含有显着更多的无机碳。直立作物与下伏沿岸沉积物之间化学计量比的比较表明，在轮藻和维管植物林分中，植物分解过程中有机碳与总氮的比率降低，这表明沉积物中氮含量显着富集。我们还尝试将沉积物中的磷池分为存在于轮藻林和富营养化湖泊深层沉积物中的有机磷和钙结合磷。在前者中，钙结合 P 估计占总 P 库的 17-19%，而在深部沉积物中它占总 P 的 42%。这种差异表明，富营养化湖泊中藻华期间的碳酸钙沉降可能更有效地捕获 P而不是覆盖在沿海地区轮藻植物的方解石结壳。总之，我们强调需要考虑经常被忽视的碳和磷的无机部分，以更好地了解湖泊沉积物中的碳和养分埋藏。