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題名 | 土壤化學物對濕潤亞熱帶表層岩溶的影響--野外監測與實驗室模擬=Influence of Pedochemical Field on Epikarstification in Humid Subtropics of China-Field Monitoring and Laboratory Modelling |
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作者 | 潘根興; 滕永忠; 陶于祥; 徐勝友; 孫玉華; | 書刊名 | 土壤與環境 |
卷期 | 1:3 1998.09[民87.09] |
頁次 | 頁201-207 |
分類號 | 434.227 |
關鍵詞 | 表層岩溶; 土壤化學物; 土壤碳; Epikarst; Pedochemical field; Soil carbon; |
語文 | 中文(Chinese) |
中文摘要 | 以桂林附近岩溶水文地毬化學試驗場為基點研究了土壤化學條件對岩溶的影響。分別用砂濾琯法,便捷式pH計及CO�紊@度計及水化學簡易測定在野外監測了岩石試片的溶解,土壤復蓋條件下土壤及岩溶水pH、CO�紊@度及HCO��-濃度。用淋溶柱法實驗室模擬了不同土壤復蓋下岩石試片的溶解。此外,岩溶系統中對植物-凋落物-土壤有機質-土壤CO��-岩溶水HCO��-鈣華-石的�CC進行了採樣和分析。結果表明, 土壤 pH,土壤有機質(由此影響CO�紊@度)及Ca�Л〝M度構成影響岩溶活動的土壤化學場、岩溶水HCO�婀狻M鈣華CaCO�陘云慢與土壤CO��-C密切相關。因此,岩溶過程涉及土壤發生性碳的作用,它通過大氣-植物- 有機質-土壤CO��-岩溶水而在系統中轉移,岩溶水文地毬化學流中存在土壤Ca�ワMHCO�隻b岩溶水的界面交換。據此提出了研究區表層岩溶碳轉移模式。 |
英文摘要 | The influence of pedochemical field on karstification was studied in the Karst Hydrogeochemical Experiment Site near Guilin. The dissolution of limestone under soil conditions regarded with pH, CO�畝nd HCO�婀笐繁oncentration in the karst system was depicted by means of sand filters, portable pH meter and CO�症as meter as well as simple hydrochemical measurments. The dissolution was also traced in laboratory under different treatments of soil covers. Futhermore, the different pools of carbon was sampled and analyzed in the karst system of plant-litter-SOC CO��-karst HCO�婀笐�-traverine-rock. The results showed that SOC (in turn, soil CO��), soil pH and Ca�� saturation constituted a pedochemical field influencing epikarstification and the carbon in karst spring and tuff was closely related with soil CO�� on origin. Therefore, carbon of soil origin was involved in karstification and transferred through the pathway of air-plant-SOC-soil CO��-karst water in the system. Consequently, a model of carbon transfer in the epikarst system of the area was proposed. |
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