| 峰丛洼地自然封育过程岩溶水溶解无机碳的变化——以桂林丫吉试验场为例 |
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| 引用本文： | 姜光辉,张强.峰丛洼地自然封育过程岩溶水溶解无机碳的变化——以桂林丫吉试验场为例[J].中国岩溶,2011,30(4):397-402. |
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| 作者姓名： | 姜光辉 张强 |
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| 作者单位： | 中国地质科学院岩溶地质研究所/国土资料部、广西壮族自治区岩溶动力学重点实验室 |
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| 基金项目： | 国土资源部地质调查项目(岩[2011]地调01-01-23)、国土资源部行业专项(200911004-1) |
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| 摘 要： | 以桂林丫吉试验场为例,检验植被恢复对岩溶碳汇的影响作用。上世纪80年代,丫吉试验场峰丛洼地的植被受砍伐干扰,地表以草地居多,此后施行自然封山育林,植被经二十多年的封育后,现在变成为灌木林,土壤中植物根系呼吸和微生物异养呼吸增强,土壤空气中CO2含量上升,岩溶作用增强,泉水输出的无机碳通量增加。通过建立系统的水化学混合模型,将泉水的无机碳通量分解为原水输出和降雨补给引起的新水输出。在一次典型的强降雨过程,S31岩溶泉原水输出量占总量的65%~83%,而降雨补给引起的新水无机碳输出通量较少,且不能反映生态环境的变化,因此应以原水中溶解无机碳的浓度衡量整个生态环境对岩溶作用的影响。长期的观测表明由于植被的改变导致原水输出的无机碳含量提高了27%,而原水在岩溶泉的年流量中所占的比例高达72%~84%,其中由植被演化造成岩溶碳汇增加的幅度为19%~23%。
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| 关 键 词： | 峰丛洼地 碳循环 岩溶水 生态恢复 |
| 收稿时间： | 2011/10/29 0:00:00 |
Change of dissolved inorganic carbon (DIC) in karst peak cluster during natural restoration: A case study in Yaji Station |
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| Jiang Guang-hui and Zhang qiang.Change of dissolved inorganic carbon (DIC) in karst peak cluster during natural restoration: A case study in Yaji Station[J].Carsologica Sinica,2011,30(4):397-402. |
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| Authors: | Jiang Guang-hui and Zhang qiang |
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| Institution: | Institute of Karst Geology, CAGS / Karst Dynamics Laboratory, MLR & GZAR |
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| Abstract: | Plant evolution at the Yaji station during the recent twenty years gives a chance for comparing the change of dissolved inorganic carbon in a typical peak cluster karst drainage system.In 1980s,plants on the peak clusters in the station were cut and used for fire wood.Most shrubs were cut regularly only grasses being remained.From 1990s people use electric and gas instead of wood.By now plants are dominated by shrub and arbor.The CO2 concentration of soil air increased during the ecological rehabilitation because of increase of soil respiration.This process enhances the DIC in spring by more intensity of karstification.By means of the hydrochemical model,the flux of spring DIC was separated.One part means that the DIC is brought by original water and the other DIC flux comes with the newly fallen rain water.The flux of original water in the spring accounts for 65 %~83 % in a typical storm event,but the carbon from the newly fallen rain water only accounts for small parts that can not reflect the environmental changes.So,it is proposed here that only the carbon flux from original water can represent the impact of plant evolution.The DIC concentration in original water increased 27 % affected by plant evolution,and the proportion of the original water accounts for 72 %~84 % of the spring’s annual flux.So the increased amount of carbon flux led by plant evolution is revised to 19 %~23 %. |
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| Keywords: | peak cluster carbon cycle karst water ecologic rehabilitation |
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