Water quality as a threat to aquatic plants: discriminating between the effects of nitrate, phosphate, boron and heavy metals on charophytes.
Water quality as a threat to aquatic plants: discriminating between the effects of nitrate, phosphate, boron and heavy metals on charophytes.
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DOI：
10.1111/j.1469-8137.2010.03543.x
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发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
S. Lambert;A. Davy
中科院分区：
文献类型：
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作者：
S. Lambert;A. Davy
·富营养化是对全球湿地的威胁。磷浓度升高往往是生物多样性和生态系统功能丧失的主要驱动因素，但事实证明，磷和氮的影响在很大程度上是不可分割的，因为它们是共线性变化的。轮藻，水生藻类，非常接近的进化联系与陆地植物谱系，提供了一个敏感的系统，解开复杂的污染物的威胁。·在这里，我们调查了英国轮藻生物多样性主要地点的水生植被和水质，并使用分层分区来区分污染物对其发生的独立影响。实验室试验研究了一个代表性物种（轮藻）的生长反应硝酸盐。·硝态氮对轮藻的危害最大。此外，C.在实验室中，在非常低的浓度以上，球形菌被抑制。铜（Cu）、镉（Cd）、钴（Co）、磷（P）、镍（Ni）、硼（B）和锰（Mn）对轮藻发生的独立影响较小。·有可能将磷和氮对该领域水生生物的有害影响分开。硝态氮是一个关键因子，是土壤中硝酸盐的年均浓度限值。2毫克升的硝酸盐氮是必要的，以保护轮藻和湿地生态系统中的服务。
• Eutrophication is a threat to wetlands worldwide. Elevated phosphorus concentration is often the main driver of loss of biodiversity and ecosystem function, but effects of phosphorus and nitrogen have proved largely inseparable, because they vary colinearly. Charophytes, aquatic algae that are very close to the evolutionary link with the land-plant lineage, provide a sensitive system for disentangling complex pollutant threats. • Here, we investigated aquatic vegetation and water quality at the principal sites for charophyte biodiversity in the UK and used hierarchical partitioning to discriminate independent effects of pollutants on their occurrence. A laboratory experiment examined the growth responses of a representative species (Chara globularis) to nitrate. • Nitrate-N exerted the greatest detrimental effect on charophyte occurrence in the field. Furthermore, growth of C. globularis in the laboratory was inhibited above very low concentrations. Smaller independent effects of copper (Cu), cadmium (Cd), cobalt (Co), phosphate-P, nickel (Ni), boron (B) and manganese (Mn) on charophyte occurrence were discriminated. • It is possible to separate the deleterious effects of phosphorus and nitrogen on aquatic organisms in the field. Nitrate is a critical factor and a mean annual average concentration limit of c. 2 mg l⁻¹ nitrate-N is necessary to protect charophytes and their services within wetland ecosystems.