云南白水台钙华池出入口水化学和δ13CDIC昼夜变化的影响因素及水生光合作用影响比例的计算

曾振宇; 晏 浩; 孙海龙; 刘再华

doi:10.11932/karst20160601

云南白水台钙华池出入口水化学和δ13CDIC昼夜变化的影响因素及水生光合作用影响比例的计算

doi: 10.11932/karst20160601

1.
中国科学院地球化学研究所/环境地球化学国家重点实验室；中国科学院大学
2.
中国科学院地球化学研究所/环境地球化学国家重点实验室
3.
中国地质科学院岩溶地质研究所/国土资源部、广西岩溶动力学重点实验室；中国科学院地球化学研究所/环境地球化学国家重点实验室

基金项目: 国家自然科学基金项目(41372263)；岩溶动力学重点实验室开放基金资助课题 (KDL2011-05)

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出版历程
- 发布日期: 2016-12-25

Theoretical calculation of aquatic photosynthesis contribution ratio and the controlling factors of diurnal vatiations of hydrochemistry and δ13CDIC in the outlets and inlets of travertine pools at Baishuitai, Yunnan, China

1.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences；University of Chinese Academy of Sciences
2.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
3.
Institute of Karst Geology, CAGS/Ministry of Land Resources and Guangxi Key Laboratory of Karst Dynamics；State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences

摘要

摘要: 钙华是岩溶区常见的次生化学沉积物，也是陆地气候环境信息的高分辨率载体之一。它的形成常常与水生植物有关，后者的新陈代谢过程可能会改变水中溶解无机碳(DIC)的同位素组成，进而影响钙华的碳同位素值。然而在古环境重建中，水生植物引起微环境变化所造成的影响常常被研究者忽视。本研究选取了白水台两个具有丰富沉水植物的钙华水池，对水池入口、出口的水化学和DIC的碳同位素组成(δ13CDIC)进行了高分辨率的昼夜观测和取样分析。结果显示，在低浓度DIC水体（S1-3）补给水池时，水池出口与入口之间的δ13CDIC的变化很小，主要反映的是出口δ13CDIC继承入口δ13CDIC，反映了滞后效应对水体δ13CDIC的控制；而在高浓度DIC水体（S1-1）补给水池时，水池出口与入口之间的δ13CDIC的变化主要受脱气作用控制。通过对水生光合作用影响比例的计算发现，由于库效应的存在，水生植物的光合作用对δ13CDIC的影响很小。
- 水化学 /
- 碳同位素 /
- 水生植物 /
- 光合作用 /
- 脱气作用
Abstract: Travertine is common secondary chemical sediment in karst areas, also one of the continental high-resolution climatic archives. Its formation is often associated with aquatic plants, whose metabolism can likely change hydrochemistry and carbon isotopic composition of dissolved inorganic carbon (DIC), thus affecting the carbon isotopic composition of travertine. However, the influence of micro-environment caused by aquatic plants is usually ignored when reconstructing paleoenvironments using carbon isotopic composition of travertine. A method of combining on-site high-resolution monitoring and in-situ titrating with measurement of samples in laboratory was used in present study to investigate the influence of submerged plant on hydrochemistry and carbon isotopic compositions of pool water. The results show that when pools were fed by low DIC concentration water (S1-3), the δ13CDIC difference between the outlet and inlet of the pool reflects the control of hysteresis effect, while fed by high DIC concentrations water (S1-1), the δ13CDICdifference between the outlet and inlet of the pool indicates the control of degassing effect. Because of the existence of the reservoir effect, the influence of metabolism of submerge plant on δ13CDICis small.
- hydrochemistry /
- carbon isotope /
- submerged plants /
- photosynthesis /
- degassing effect

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