Does calcite encrustation in Chara provide a phosphorus nutrient sink?
Does calcite encrustation in Chara provide a phosphorus nutrient sink?
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DOI：
10.2134/jeq2005.0276
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发表时间：
2006-02
影响因子：
2.4
通讯作者：
K. Siong;T. Asaeda
中科院分区：
文献类型：
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作者：
K. Siong;T. Asaeda
研究了轮藻（Chara spp.）对水生生态系统中磷循环的影响。对钙化和未钙化的纤维轮藻（Chara fibrosa Agardh ex Bruzelius）节间的P组分进行了连续分级。结果表明，Ca-CF具有较好的固磷能力，其中约14 ~ 23%的磷与方解石共沉淀，而UCa-CF中只有23%的磷与方解石共沉淀。此外，在Ca-CF中，总P量的增加并没有导致更高的生物可利用的水溶性和氢氧化钠可提取P的释放。轮藻细胞外钙化增强了P的营养库，提供了进一步的自下而上的控制浮游植物，并应被视为稳定轮藻在湖泊中的优势地位的正反馈。
We studied the effect of calcite encrustation in stoneworts (Chara spp.) on P cycling in an aquatic ecosystem. Sequential fractionation was performed to quantify P fractions of the internodes of calcified (Ca-CF) and uncalcified (UCa-CF) Chara fibrosa Agardh ex Bruzelius. Our results showed that Ca-CF was able to store more P and about 14 to 23% of total P in Ca-CF was co-precipitated with encrusted calcite, while only 2 to 3% was found in UCa-CF. Furthermore, in Ca-CF, an increased amount of total P did not result in a higher release of bioavailable water-soluble and sodium hydroxide-extractable P. Extracellular calcification in Chara enhanced nutrient sink for P, provided a further bottom-up control of phytoplankton, and should be regarded as a positive feedback in stabilizing Chara dominance in lakes.