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张美良,朱晓燕,林玉石,覃嘉铭,章程,罗贵荣,杨琰.洞穴石笋的δ13C记录研究[J].广西科学,2006,13(1):48-51,57. [点击复制]
- ZHANG Mei-liang,ZHU Xiao-yan,LIN Yu-shi,QIN Jia-ming,ZHANG Cheng,LUO Gui-rong,YANG Yan.Study on δ13C Isotope Records from Stalagmites[J].Guangxi Sciences,2006,13(1):48-51,57. [点击复制]
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| 洞穴石笋的δ13C记录研究 |
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张美良, 朱晓燕, 林玉石, 覃嘉铭, 章程, 罗贵荣, 杨琰
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| (中国地质科学院岩溶地质研究所岩溶动力学重点实验室, 广西桂林 541004) |
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| 摘要: |
| 分别采集贵州荔波董哥洞、荔浦丰鱼岩、桂林响水洞的石笋,研究三个洞穴分辨率达1000年、100年、10年级的石笋δ13C记录。结果表明,石笋δ13C值可以系统地记录地表岩溶作用过程与植被生态变化的历史。在冰期或干旱寒冷期,岩溶不发育,成壤条件差而缓慢,不利于植被生长,δ13C值偏重,以C4植物(禾本科植物)为主。在温暖湿润期,岩溶发育好,成壤条件好而且速度快,利于植被生长,δ13C值偏负或偏轻,以C3(木本植物)植物为主。晚全新世以来,人类活动持续不断地破坏森林植被,草类植被得以生长,石笋的δ13C值急速上升、偏重,以C4植物为主,石漠化增强,水土流失严重。此后,升高的δ13C值很难再回复到中全新世以前的水平。自然因素和人类活动因素等对生态环境的影响,均会导致植被变化,成倍放大δ13C值,特别是人类活动对自然生态的影响更为严重。 |
| 关键词: 石笋 碳同位素 记录 植被 |
| DOI： |
| 投稿时间：2005-09-06 |
| 基金项目:中国科学技术部"中国洞穴石笋样品保护库的建造"项目(编号:2003DEB6J069);国家自然科学基金(批准号90511004和40231008)资助 |
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| Study on δ13C Isotope Records from Stalagmites |
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ZHANG Mei-liang, ZHU Xiao-yan, LIN Yu-shi, QIN Jia-ming, ZHANG Cheng, LUO Gui-rong, YANG Yan
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| (Karst Dynamics Key Laboratory, Institute of Karst Geology, CAGS, Guilin, Guangxi, 541004, China) |
| Abstract: |
| High resolution δ13C isotope records from three stalagmites in millennial, centennial and decade timescale were obtained from Dongge Cave of Libo, Guizhou, Fengyu cave of Lipu, Guangxi and Xiangshui Cave of Guilin, respectively.The results indicate that karst is lack of development, the condition of the soil-forming is poor and slow, which hampered vegetation grow, resulting in C4 plant dominant with the heavier δ13C value in the glacial period or colddry period.Otherwise in warm-humid stage karst is well development, soil-forming is fast with good conditions, vegetation grow well, thus C3 plant has predominant with the negative value.Since late Holocene, human activity may predominate over the nature, the forest vegetation is destroyed continuous but grass grows well, which C4 plant become the dominant vegetation, the δ13C value of stalagmites increase rapidly, rock desertification aggravate because of serious water and soil erosion.Since then, it is very difficult to make heavier δ13C value back to the level before middle Holocene.By discussing the effect factors of δ13C value change from stalagmites, we considered that the influence of the ecological environment from the nature factor or human activity could result in the vegetation change, and δ13C value change could make enlargements of double, decade times, and hundred times.In particular, human activity affects nature ecological environment more severely.The influence of human activity only brings about the degeneration of forests and vegetation, leads to δ13C value change from stalagmites, and also accelerates aggravation of rock desertification, serious water and soil erosion in karst region. |
| Key words: stalagmite carbon isotopic record vegetation |
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