摘要
以生长在钙华池中的单生卵囊藻(Oocystis solitaria Wittr)为研究对象,利用pH漂移方法,探讨了封闭系统中单生卵囊藻在岩溶水和非岩溶水环境下对溶解无机碳(DIC)利用及其对水体Ca2+沉积影响的差异。结果表明,单生卵囊藻在低CO2浓度时,通过胞外碳酸酐酶的催化,以HCO3-作为无机碳源进行光合作用。在岩溶水环境下单生卵囊藻DIC利用能力要高于非岩溶水环境(4.78倍),而在此过程中对水体中Ca2+沉积的影响也更高(2.13倍)。在岩溶水(非岩溶水)环境下,有42.6%(8.9%)的Ca2+通过物理化学效应以CaCO3形式沉积,其余Ca2+可能被藻体生长而吸收利用。
The difference in dissolved inorganic carbon （DIC） utilization and calcium carbonate precipitation by Oocystis solitaria Wittr which grown in closed systems of karst water and non-karst water was investigated by using free pH-drift method. The results show that the HCO3 is the carbon resource of Oocystis solitaria Wittr photosynthesis catalyzed by carbonic anhydrase （CA）, at low CO2 concentration. The DIC utilization and calcium carbonate precipitation by Oocystis solitaria Wittr were 2 and 4 times higher in karst water than in non-karst water, respectively. About 42.6% and 8.9% of calcium ions was precipitated as calcium carbonate in karst and non-karst water via physiochemical effect, respectively and the remaining was utilized by Oocystis solitaria Wittr for its growth.
出处
《地球化学》
CAS
CSCD
北大核心
2010年第2期191-196,共6页
Geochimica
基金
中国科学院百人计划项目
国家自然科学基金(40872168)
关键词
CACO3
沉积
无机碳利用
单生卵囊藻
岩溶水
非岩溶水
calcite precipitation
inorganic carbon utility
Oocystis solitaria Wittr
karst water
non-karst water
