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Vertical distribution of elements in soil profiles in Longhai,Fujian Province |
LIU Yin-Fei1,2,3, SUN Bin-Bin1,2,3, HE Ling2,3, ZENG Dao-Ming2,3, LIU Zhan-Yuan2,3, ZHOU Guo-Hua2,3 |
1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China;
3. Key Laboratory for Geochemical Exploration Technology, MLR, Langfang 065000, China |
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Abstract Based on geochemical data collected along four profiles at different types of geological setting and soil parent materials from Longhai, Fujian Province, the authors studied the concentrations and distribution patterns of major elements and trace elements. The results show that chemical weathering is intense. A lot of elements such as Ca, Mg, Na, Si and K have been seriously leached, but Fe and Al have been accumulated. The weathering-leaching index (ba value) and the ratio of Si to Fe and Al (Saf value) of the study area under the warm and humid subtropical condition are much lower than the average values of the whole country. The weathering degree has reached the stage of Si loss and Al-Fe enrichment, especially for the soils derived from granite rocks. Soil environmental quality is quite good due to its relative low concentration of heavy metals. It is found that the concentrations of trace elements including heavy metals are mainly controlled by the parent materials, and their vertical distribution along these profiles is mainly controlled by major components and organic carbon, indicating significant correlation between them. The concentrations of trace elements along profile 1 derived from alluvial and marine sediments are much higher than those of other three profiles. The relative low concentrations of Fe, Al as well as heavy metals may be attributed to the leaching of fine clay particles by surface runoff and infiltration. Several kinds of heavy metals such as Hg, Cd, Pb and Zn show accumulation in top soils under bio-geochemical cycle and human activities. The relative enrichment factors of most heavy metals are less than 1, which means that the anthropogenic influence are not serious except for Hg and P.
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Received: 26 October 2015
Published: 10 August 2016
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