概括
水生植物主要从沉积物中吸收,即使在富含营养的水中也是如此. 这项研究强调了水下巨生物作为营养循环中的关键参与者,在水生生态系统中充当营养.
科学领域:
- 水生植物学 水生植物学
- 临界技术 临界技术
- 营养素循环的循环.
背景情况:
- 水生巨型植物对湖泊生态系统至关重要.
- 的可用性往往限制了水生植物的生长.
- 沉浸在水中的巨型植物的主要来源仍在争论中.
研究的目的:
- 确定自然环境中水下水生巨型植物的主要来源.
- 为了量化沉积物对巨生物吸收的贡献,在不同的热量状态.
主要方法:
- 在现场实验中,研究人员对9种常见的水生巨生物进行了实验.
- 植物生长在中缩,轻度缩和高缩的海湾.
- 从沉积物中吸收的量度是在植物生长期间进行的.
主要成果:
- 所有研究的巨型植物物种都从中和轻微中条件下的沉积物中获得了所有的.
- 在高缩条件下,沉积物仍然平均提供了巨体吸收的总的72%.
- 这表明对沉积物结合的持续和显著依赖.
结论:
- 沉浸在水中的水生巨生物在自然环境中的供应绝大多数依赖沉积物.
- 这些植物作为重要的营养,将从沉积物转移到开放水柱.
- 了解这种动态对于管理水生生态系统中的营养水平和缩至关重要.
相关概念视频
01:21The Phosphorus Cycle
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:06Primary Production
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
04:01Factors Affecting Solubility
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.