岩溶水库藻源性有机质来源对表层沉积物有机碳矿化过程的影响  

Effects of algae-derived organic matter source on sediment mineralization in the karst reservoir

作　　者：黄思宇 蒲俊兵 潘谋成[4] 李建鸿[4] 张陶 HUANG Siyu;PU Junbing;PAN Moucheng;LI Jianhong;ZHANG Tao(College of Environment and Resources,Guangxi Normal University,Guilin 541006,China;Guangxi Key Laboratory of Environmental Processes and Remediation in Ecologically Fragile Regions,Guilin 541006,China;Chongqing Key Laboratory of Carbon Cycle and Carbon Regulation of Mountain Ecosystem,Chongqing Normal University,Chongqing 401331,China;MNR and Guangxi Key Laboratory of Karst Dynamics,Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin 541004,China)

机构地区：[1]广西师范大学环境与资源学院,广西桂林541006 [2]广西生态脆弱区环境过程与修复重点实验室,广西桂林541006 [3]重庆师范大学山区生态系统碳循环与碳调控重庆市重点实验室,重庆401331 [4]中国地质科学院岩溶地质研究所自然资源部、广西岩溶动力学重点实验室,广西桂林541004

出　　处：《地学前缘》2024年第5期387-396,共10页Earth Science Frontiers

基　　金：国家自然科学基金项目(41977166,42407079);重庆市自然科学基金项目(CSTB2022NSCQ-LZX0022);广西高校中青年教师科研基础能力提升项目(2021KY0054);重庆师范大学基金项目(21XRC002)。

摘　　要：岩溶水生环境富含HCO-3,有利于内源藻类发生生物碳泵作用,形成大量藻源有机质沉积到库底。丰富的藻源性有机质在沉积物中发生矿化作用,影响有机质埋藏过程,影响岩溶水生环境碳循环过程和碳汇潜力。为探究藻源性有机质对矿化作用的影响和岩溶水生环境碳循环稳定性的影响,以岩溶地下水补给型水库(广西大龙洞水库)为研究对象,初步分析从上游到下游不同区域藻源有机质对表层沉积物有机质矿化过程的影响。结果表明:大龙洞水库有机质主要来源为内源藻类(20.9%~65%)和外源土壤(11.8%~53.4%)且具有一定的空间差异,水库上游以土壤来源为主,下游以藻类来源为主。大龙洞水库表层沉积物矿化过程在空间上呈现上游潜在矿化量高于下游潜在矿化量,产生差异的主要因素是在岩溶高溶解无机碳水环境中,藻源性有机碳对微生物矿化过程具有抑制性,降低矿化强度。在生物碳泵作用和无机碳保护下,以藻源性来源为主的岩溶水库表层沉积物有机碳潜在埋藏总量略高于岩溶区土壤的潜在埋藏总量,表明岩溶水库沉积物有着稳定的有机成分积累。In the karst reservoir,there are a lot of HCO-3 in the water column,which can promote algae to function of biological carbon pump and lead the algae organic matter to be deposited under the water column.Meanwhile,algae organic matter is mineralized on the sediment suffer in order to affect the organic matter burial,carbon cycle of karst aquatic environment.To study effect and of algae-derived organic matter source on sediment mineralization,we selected the Dalongdong Reservoir as the object and analyzed carbon cycle stability of karst reservoir aquatic environment.The results revealed that:organic carbon in the surface sediment come from the algae source(20.9%65%)and soil source(11.8%53.4%),which organic carbon of algae source was mainly deposited on the downstream and soil source'was on the upstream.The potential mineralization on the upstream was higher than that on the downstream,because the mineralization process of organic carbon was influenced by organic source difference,especially algae-source;with biological carbon pumping effect and inorganic carbon protection,potential burial volume in the surface sediment of karst reservoir was higher than that in the karst soil,which showed that sediment structure in the karst reservoir was stable.

关 键 词：岩溶水库 藻源性有机质 矿化过程 无机碳保护 碳库稳定性 

分 类 号：P642.25[天文地球—工程地质学] Q948[天文地球—地质矿产勘探]