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| 云南石林地区土壤侵蚀的石笋记录与现代观测 | |
| 引用本文： | 蔡炳贵,程海,侯居峙,刘宏,王国安,刘东生.云南石林地区土壤侵蚀的石笋记录与现代观测[J].第四纪研究,2005,25(2):170-175. |
| 作者姓名： | 蔡炳贵 程海 侯居峙 刘宏 王国安 刘东生 |
| 作者单位： | 1. 中国科学院地质与地球物理研究所,北京,100029 2. Department of Geology and Geophysics, University of Minnesota,Minneapolis MN 55455 USA 3. Department of Geological Sciences,Brown University,Providence RI 02912 USA 4. 云南大学云南省地理研究所,昆明,650223 5. 中国农业大学资源与环境学院,北京,100094 |
| 基金项目： | 国家自然科学基金;云南省石林研究基金 |
| 摘 要： | 通过研究云南乃古石林地区的洞穴沉积物———石笋,结合土壤侵蚀观测结果,发现石笋中的每一个夹泥层代表一次地表快速剥蚀事件,进而讨论了土壤侵蚀事件在石林发育过程中的意义。结果表明:石林发育的自然过程之一是土体较长时期稳定、实现土下溶蚀,协同土壤阶段性的快速剥蚀过程,脉动式相对向上“生长”。石林地区全新世曾经历过数次快速剥蚀过程。 |
| 关 键 词： | 石笋 土壤侵蚀 石林 成因 |
| 文章编号： | 1001-7410(2005)02-170-06 |
| 收稿时间： | 2004-12-10 |
| 修稿时间： | 2004年12月10 |
THE IMPACT OF SOIL EROSION ON THE FORMATION OF YUNNAN STONE FOREST:EVIDENCES FROM STALAGMITE AND FIELD OBSERVATIONS |
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| Cai Binggui,Cheng Hai,Hou Juzhi,Liu Hong,Wang Guo'an,Liu Tungsheng.THE IMPACT OF SOIL EROSION ON THE FORMATION OF YUNNAN STONE FOREST:EVIDENCES FROM STALAGMITE AND FIELD OBSERVATIONS[J].Quaternary Sciences,2005,25(2):170-175. | |
| Authors: | Cai Binggui Cheng Hai Hou Juzhi Liu Hong Wang Guo'an Liu Tungsheng |
| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029; 2. Department of Geology and Geophysics, University of Minnesota, Minneapolis MN 55455 USA; 3. Department of Geological Sciences, Brown University, Providence RI 02912 USA; 4. Yunnan Institute of Geography, University of Yunnan, Kunming 650223; 5. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094 |
| Abstract: | The Yunnan Stone Forest is an extreme form of karren and very attractive due to its beauty and singularity in karst topography around the world. Previous studies over the last two decades have demonstrated that the pinnacles of the Yunnan Stone Forest were mainly shaped through subsoil corrosion, together with slight modifications of the upper parts by direct rainwater corrosion. However, few studies had addressed the important impact of soil erosion on the formation of the Yunnan Stone Forest. In this study, a Holocene stalagmite (NG02) from a cave at the Naigu Stone Forest, Yunnan, China, was used to obtain the flood history in the area. The soil erosion rates were also determined at the major Stone Forest site over almost two raining seasons from June, 2002 to October, 2003. The relative lower position of stalagmite NG02 in the cave allows it to be capable of recording the larger flood events (possibly in centenary frequency) that overflowed the stalagmite. As we observed, the soil erosion in a bare was quite quick during a common year and, thus, these large flood events can carry a lot mud into the cave and produce a series of mud layers in stalagmite among the gray-yellow calcites precipitated from the cleaner dripping water. In contrast to the soil stable period as indicated by the continuous growth of clean calcite of the stalagmite, the large flood events can wash away significant amount of soil and, therefore, represent soil erosion time. These periodically occurred soil stable and erosion cycles are consistent with the observed morphological features of the karrens, suggesting that the long term subsoil corrosion under a stable soil status was periodically interrupted by a series of abrupt and short soil erosion events during Holocene and this alternation corrosion process plays an important role in the formation of the Yunnan Stone Forest. |
| Keywords: | stalagmite soil erosion evolution of Stone Forest |
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