Dissolved Inorganic Carbon (DIC)
Dissolved Inorganic Carbon (DIC)
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溶解无机碳 (DIC)
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Stiller
中科院分区：
文献类型：
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作者：
A. Nishri;M. Stiller
多种因素控制着Kinneret湖浮游植物群落的季节演替。其中一个因素是他们是否是CO2或HCO 3-用户。在春季，仅CO2的用户，如甲藻Peridinium gatunense往往占主导地位，尽管环境中的含水CO2水平极低，其相当差的碳浓缩机制，并开发一个水华。基于钙和碳酸盐浓度的季节动态、质量平衡考虑以及碳酸盐δ 13 C和水相CO2（δ 13 C）之间的关系，我们认为，与水华同时发生的大量方解石沉淀提供了藻类发展和维持水华所需的CO2（aq）。春季，除了河流流入提供了大部分HCO 3 −、Ca 2+、P、N、Se（IV），或许还有微型浮游生物（似乎是方解石晶体生长的核），相对较高的温度和较低的风也支持了水华。低风速限制了气体交换，促进了地表水中CO2（aq）的逐渐积累不足，导致pH值升高，Ω方解石升高，从而诱导大量方解石沉淀。到这个季节结束时，湖面水沉淀方解石的能力几乎耗尽，碳酸氢盐用户接管。
Various factors control the seasonal succession of the phytoplankton community in Lake Kinneret. One such factor is whether they are CO2 or HCO3 − users. In spring, CO2-only users such as the dinoflagellate Peridinium gatunense often predominate and develop a bloom despite of extremely low levels of ambient aqueous CO2 and its rather poor carbon-concentrating mechanism. Based on seasonal dynamics of calcium and carbonate concentrations, mass balance considerations, and the relationships between planktonic δ13C and aqueous CO2 (δ13C), we claim that massive precipitation of calcite which occurs concomitant with the bloom supplies the CO2(aq) needed for the algae to develop and maintain the bloom. Besides riverine inflows that supply most HCO3 −, Ca2+, P, N, Se(IV), and perhaps also picoplankton (that seem to serve as nuclei for calcite crystal growth) in the spring, the prevalence of relatively high temperatures and low winds also supports the bloom. The low wind restricts gas exchange and facilitates the gradual accumulated deficiency in CO2(aq) in surface water leading to higher pH and a raise in Ωcalcite to an extent that induces massive calcite precipitation. By the end of this season, the capacity of the lake surface water to precipitate calcite is almost exhausted and bicarbonate users take over.