石漠化治理区表层岩溶泉流量衰减分析及无机碳通量估算——以重庆酉阳龙潭槽谷老泉为例  

Flow attenuation analysis and inorganic carbon flux estimation of surface karst spring in rocky desertification control area:A case study at Laoquan spring in the Longtan trough valley,Youyang county,Chongqing City,China

作　　者：罗振宇 杨琰 李计 肖文杰 孙婷婷 叶枝茂 LUO Zhenyu;YANG Yan;LI Ji;XIAO Wenjie;SUN Tingting;YE Zhimao(Chongqing Key Laboratory of Karst Environment,School of Geographical Sciences,Southwest University,Chongqing 400715,China;National Observation and Research Station of Karst Ecosystem in Jinfo Mountain of Chongqing,Chongqing 400715,China)

机构地区：[1]西南大学地理科学学院岩溶环境重庆市重点实验室,重庆400715 [2]重庆金佛山喀斯特生态系统国家野外科学观测研究站,重庆400715

出　　处：《中国岩溶》2023年第2期337-350,381,共15页Carsologica Sinica

基　　金：国家自然科学基金项目(42277048);国家重点研发计划子课题(2016YFC050230205)。

摘　　要：应对“双碳”目标,加强岩溶石漠化综合治理工作,地下水是关键。为探究重庆市酉阳县龙潭槽谷石漠化治理区岩溶泉的流量衰减及无机碳通量变化特征,采用流量衰减方程与水化学径流法对研究点老泉进行模拟与分析。结果表明:(1)老泉的流量衰减分为两个亚动态,衰减系数分别为0.089 2、0.019 6,其具有双重性含水介质特征。(2)暴雨期老泉的碳通量随流量变化的特征明显;而伏旱期(7月底-8月底)老泉的碳通量与土壤CO_(2)、泉水CO_(2)均具有明显的昼夜变化特征,表现为夜间低、日间高。(3)老泉夏季的碳通量与降水量呈正相关(R=0.78),与蒸发量呈负相关(R=-0.36),气候的不稳定性变化对碳通量影响显著。老泉的月HCO_(3)^(-)浓度与月土壤CO_(2)浓度的相关系数为0.64,HCO_(3)^(-)敏感地响应土壤CO_(2)的变化;而老泉年碳通量与年土壤CO_(2)浓度的相关系数为0.90,且年均δ13C_(DIC)呈偏负趋势,土地利用变化(植被恢复)有利于土壤CO_(2)及老泉碳通量的增加。(4)老泉2018-2021年的碳通量呈波动上升趋势,年均无机碳通量为15.05 t·km^(-2)·a^(-1)。研究结果能为石漠化生态恢复治理工作提供参考。The rational utilization of groundwater resources is the key to achieving the carbon peaking and carbon neutrality goals,strengthening the comprehensive control of karst rock desertification and soil erosion in the ecological environment.On the southern wing of Tongmaling anticline in southeast Chongqing,Longtan trough valley-a part of Wuling Mountain area-is located in Youyang county,Chongqing City,China.The karst development is strong in the trough valley area,and the distribution of groundwater is extensive.At the same time,the problem of rocky desertification is severe in this area,so the efficient utilization of water resources and ecological restoration are especially important.The objective of this study is to explore the flow characteristics of karst spring and structure types of aquifer medium,and to further analyze the variation characteristics of inorganic carbon flux in the ecological restoration area of rock desertification control.In this study,the flow attenuation equation and hydrochemical runoff method are used to estimate and analyze attenuation process and inorganic carbon flux of Laoquan spring based on the re-vegetation in a karst rocky desertification area in Longtan trough valley in Youyang county,Chongqing City,Southwest China.The results show that:(1)The flow attenuation process of Laoquan spring is divided into two sub-dynamics with attenuation coefficients of 0.0892 and 0.0196,respectively.The attenuation process of this spring mainly occurs on the first sub-dynamics.In the aquifer medium of groundwater system,the ratio of pipeline to fissure is significant.The strong water conduction effect of aquifer medium leads to the weak capacity of Laoquan spring to regulate and store rainfall infiltration water.(2)The variation process of the carbon flux of Laoquan spring during the rainstorm period is divided into four stages,and the carbon flux has obvious variation characteristics with the flow.The carbon flux during the rainstorm period is 97.64 kg·km^(−2)·d^(−1).In the summer drought

关 键 词：岩溶泉 流量衰减 碳通量 岩溶石漠化 重庆市酉阳县 

分 类 号：X171.4[环境科学与工程—环境科学] P641.134[天文地球—地质矿产勘探]