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桂林丫吉岩溶试验场不同地貌部位土壤钙元素形态特征

ISSN号：1674-5906
期刊名称：《生态环境学报》
时间：0
分类：P6[天文地球—地质学]
作者机构：[1]国土资源部/广西岩溶动力学重点实验室,中国地质科学院岩溶地质研究所,桂林541004, [2]联合国教科文组织国际岩溶研究中心,桂林541004
相关基金：Foundation： Natural Scientific Foundation for Young Scientists of China （No.41402326）; Natural Scientific Foundation for Young Scientists of Guangxi Zhuang Autonomous Region of China （No. 2013GXNSFBA019217）; the Natural Scientific Foundation of Guangxi Zhuang Autonomous Region of China （No.Guikehe 14125008-2-1）; the China Geological Survey （Nos. 1212010911062, S-2010-KP03 - 07-02 and 12120113005300）; the Ministry of Land and Resources （No. 201211086-05）; and Institute of Karst Geology, CAGS （No.2012005）.

作者：杨慧[1,2], 梁建宏[1,2], 陈家瑞[1,2], 曹建华[1,2]

关键词：岩溶区, 地貌, 钙形态, 迁移, karst area, landform, calcium speciation, migration

中文摘要：

岩溶区石灰土是在热带、亚热带地区碳酸盐岩类经溶蚀风化后的产物，岩溶区石灰土具有富钙偏碱的地球化学特点，但是岩溶区石灰土中钙的形态特征尚不清楚。为研究岩溶区土壤钙的形态随季节变化特征，在丫吉岩溶试验场不同地貌部位采集土壤样品，采用BCR方法，分析和探讨了土壤中钙的形态特征及其随季节的迁移特征。结果表明：（1）总体上，研究区土壤总钙平均含量为5．25±0．68gkg^-1，各形态钙所占总钙的比例大小顺序为酸溶态〉可还原态〉残渣态〉可氧化态；并且除可氧化态钙之外，其余钙形态与土壤总钙均呈极显著的正相关关系（P〈0．01）；（2）从季节上看，基本均表现为随着四季的更替，逐渐降低，但除残渣态钙随季节变化差异显著外，总钙和其余钙形态在季节上的差异不显著；（3）从地貌上来看，总钙和各形态钙含量均表现为坡地最大，并且坡地与其它地貌部位的差异性显著（P〈0．05），而平原、垭口和洼地的各形态钙之间的差异不显著（P〉0．05）。

英文摘要：

Limestone soil in karst areas is the product of weathering and carbonate rock dissolution in tropical and subtropical regions. Limestone soil in karst regions has a Ca-rich alkaline geochemical environment, but the characteristics of calcium speciation in limestone soil remain unclear. Here, to study changes in calcium speciation in soil across seasons in a karst area, different geomorphological positions and soil samples were collected from the Yaji karst experimental site. Using European Community Bureau of Reference （BCR） methods, we analyzed and discuss soil calcium speciation and seasonal migration characteristics. We found that total soil Ca content was 2.80-11.75 g kg^-1, with an average of 5.25±0.68 g kg^-1 （mean±SE）. The order of content of each Ca speciation is extractable-Ca〉reducible-Ca〉residual-Ca〉oxidizable-Ca. In addition to oxidizable-Ca, other Ca species had a positive correlation with total calcium. The calcium content and various forms of calcium content decreased gradually with changing season, but in addition to differences in residual calcium across seasons, total calcium and other forms of calcium across seasons were not different. Total calcium and different forms of calcium content were highest at sloped areas; slopes and other landforms were different but differences between plain, saddle and depression areas were not significant.

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