| 汉江上游谷地与渭河谷地黄土化学风化程度比较 |
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| 引用本文： | 卞鸿雁,庞奖励,黄春长,查小春,王学佳,高鹏坤,李欣,王蕾彬.汉江上游谷地与渭河谷地黄土化学风化程度比较[J].地理研究,2014,33(4):654-664. |
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| 作者姓名： | 卞鸿雁 庞奖励 黄春长 查小春 王学佳 高鹏坤 李欣 王蕾彬 |
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| 作者单位： | 陕西师范大学旅游与环境学院, 西安 710062 |
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| 基金项目： | 国家自然科学基金项目（41271108，41030637）；教育部博士点基金优先发展领域项目（20110202130002） |
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| 摘 要： | 比较汉江上游谷地及渭河谷地典型黄土剖面的元素组成、化学风化强度及常量元素迁移特征,揭示秦岭南北两侧黄土—古土壤剖面的成壤强度及其所指示的环境演变特征,两者差异及共性如下:①两剖面化学组成均以SiO2、Al2O3和Fe2O3为主,元素组成均一且高度混合,与上部陆地壳(UCC)的化学成分十分接近,该些证据均指示两区域黄土是来源广泛并经过充分混合的风尘堆积产物。②据CIA值可判定MTS及YHC剖面均经历了中等风化作用,比较两剖面CIW值、A-CN-K三角图投点特征及元素迁移率知,汉江上游谷地的黄土—古土壤序列经历的化学风化作用更强,Ca及Na元素的丢失率更高,Al、Na、Mg、Si等常量元素的迁出率更大。③依据Fe、Na迁移率的全剖面变化曲线知,汉江上游谷地与渭河谷地自全新世以来经历了相同的气候演变阶段,均记录了6000-5000a BP的干冷气候事件。
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| 关 键 词： | 渭河谷地 汉江上游谷地 黄土—古土壤 化学风化 元素迁移 |
| 收稿时间： | 2013-09-17 |
A comparative study of chemical weathering intensity and element transport features of loess-palaeosol in the upper reaches of Hanjiang and Weihe river valleys,China |
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| BIAN Hongyan,PANG Jiangli,HUANG Chunchang,ZHA Xiaochun,GAO Pengkun,WANG Xuejia,LI Xin,WANG Leibin.A comparative study of chemical weathering intensity and element transport features of loess-palaeosol in the upper reaches of Hanjiang and Weihe river valleys,China[J].Geographical Research,2014,33(4):654-664. |
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| Authors: | BIAN Hongyan PANG Jiangli HUANG Chunchang ZHA Xiaochun GAO Pengkun WANG Xuejia LI Xin WANG Leibin |
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| Institution: | Department of Tourism and Environment Science, Shaanxi Normal University, Xi'an 710062, China |
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| Abstract: | Loess-palaeosol profile in the Chinese Loess Plateau has been regarded as one of the best media that can reflect global paleo-climatic changes. Previous studies chemical weathering intensity of loess-palaeosol are mainly conducted on the Loess Plateau, lower reaches of Yangtze River, Xinjiang Autonomous Region, as well as western Sichuan province, but fewer on the difference between the loess-palaeosol weathering intensity in the Hanjiang River Valley and Loess Plateau. So a comparative study of chemical weathering intensity and element transport features of loess-palaeosol in the upper reaches of Hanjiang and Weihe river Valleys was carried out in the paper, the differences and similarities of pedogenic strength and chemical weathering intensity between the Hanjiang and Weihe river valleys were discovered as follows: (1) The loess-palaeosol composition of Hanjiang River valley and Weihe River valley is quite similar to the UCC (upper continental crust) average composition that indicates the loess of two regions came from multiple sources and mixed well. The above evidences showed that the loess of the two regions was aeolian loess. (2) Compared with the morphological and color characters, chemical index (CIA/CIW), the leaching rate of Na and Ca, the mobility of major elements, the loess of the Hanjiang River Valley underwent stronger chemical weathering intensity. (3) Both the two loess-palaeosol profiles of YHC and MTS record the cold and dry event which occurred during 6000-5000 a BP. |
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