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Carbon and nutrients transfer from primary producers to lake sediments - A stoichiometric approach

机译：碳和营养从初级生产者转移到湖泊沉积物 - 一种化学计量的方法

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摘要

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 re-spective lake sediments. Studies were carried out in one eutrophic and two mesotrophic lakes. Samples of se-diments were taken from profundal and from littoral zones, the latter divided into such overgrown by char-ophytes 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 car-bonate during algal blooms. Extremely low inorganic carbon input to profundal sediment of one of the meso-trophic 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 re-duction 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.
机译：我们的旨在证明来自三个主要生产者（植物植物，龟骨菌和血管淹没的MAcrophytes）的有机和无机碳，氮和磷的不同输入，以重新观察湖泊沉积物。在一种富营养化和两个脑养殖湖中进行研究。 Se-倍倍的样品取自丰满的和来自沿沿型区的，后者分为由炭灰质和其他由血管浸没的宏粒覆盖的覆盖的过度制备。我们应用了一种化学计量的方法来说明可变官能碳的营养关系。在整产沉积物中，由于藻类盛开期间，由于钙砂骨沉淀的钙质湖泊的沉积物中发现了最低的有机物。通过低浮游植物的生产，也可以通过低浮游植物的生产来解释极低的无机碳投入到其中一个中间脱蛋白湖泊之一的流利沉积物，而且通过沉积碳酸钙溶解。甲型细胞主导的沿型沉积物含有比其他沿海和丰富的沉积物更大的无机碳。植物常规作物和底层沉积物之间的化学计量比的比较表明，在血管植物和血管厂的植物分解期间，通过再延缓有机碳与总氮比的施氮中的沉积物的显着富集。我们还试图将沉积物中的磷池分成有机P和富含野生湖的丰富沉积物中的有机P和钙结合的P.在前者中，钙-Nound P估计在总P池的17-19％，而在整产沉积物中，占总P总量的42％。这种差异表明富养殖湖中藻类盛开期间的碳酸钙沉降可能更多在P诱捕比沿着沿着沿沿沿沿陆地网站的野生素植物的方解石镶嵌有效。在结论中，我们强调了考虑透露碳和磷的无机分数的需要，以更好地了解湖泊沉积物中的碳和养分。

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