Element geochemical characteristics of weathering crust profiles of the Wenchuan section in the upper arid valley of the Minjiang River
ZHOU Xue-Ni1,2(), CAO Ya-Ting1, JI Yang1
1. Civil-military Integration Center of Geological Survey, China Geological Survey, Chengdu 610036, China 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
This study conducted geochemical tests and analyses for vertical rock-soil profiles with different bedrock types in the Wenchuan section in the upper arid valley of the Minjiang River. Based on the above, this study explored the vertical distributions of elements in these weathering crust profiles to investigate the influence of bedrocks on the contents of chemical elements in soils. From a geological perspective, this study provided proposals for planting in agricultural production and eco-environmental restoration for the study area. The results of this study are as follows: (1) From top to bottom, weathering crust profiles can be divided into four layers: the humus layer (A), the illuvial layer (B), the soil parent material layer (C), and the bedrock layer (R). The humus layers exhibit higher average values of Al, Ca, K, Mg, Fe, Se, Zn, Cu, Cd, and Pb and lower average values of Si, Na, Mn, Cr, As, Cd, and Hg, compared to corresponding national average values in soils; (2) In weathering crust profiles with different bedrock types, except for elements with higher contents in both bedrocks and corresponding soil layers, the same elements manifest similar contents in other soil layers; (3) The chemical weathering intensity increased from the bedrock to the humus layers, with soil weathering degrees generally higher than bedrock weathering degrees; (4) In addition to characteristics inherited from soil parent materials, elements in weathering crust profiles show content differentiation, characterized by enriched Al, K, and Se in humus layers, enriched Na, Fe, Si, Pb, Cu, Zn, Mn, As, Cd, Cr, and Hg in illuvial layers, and enriched Mg and Ca in soil parent material layers.
周雪妮, 曹亚廷, 计扬. 岷江上游干旱河谷区汶川段风化壳剖面元素地球化学特征[J]. 物探与化探, 2024, 48(3): 597-608.
ZHOU Xue-Ni, CAO Ya-Ting, JI Yang. Element geochemical characteristics of weathering crust profiles of the Wenchuan section in the upper arid valley of the Minjiang River. Geophysical and Geochemical Exploration, 2024, 48(3): 597-608.
Yang Z P, Chang Y. Ecological problems of primary dry valleys is Southwest China and advances in the researches into them[J]. Agricultural Research in the Arid Areas, 2007, 25(4):90-93,99.
Zhou Y G. Evaluation on soil ecological benefits in different land use/vegetation restoration in the key region of the upper reaches of Minjiang river-valley[D]. Yaan: Sichuan Agricultural University, 2014.
Ding M T, Zhou P, Zhang Y W, et al. Quantitative determination of boundary fluctuation in arid valley of the upper Minjiang River and its evolution feature[J]. Mountain Research, 2017, 35(2):170-178.
Fu Y L. Study on evaluation of soil quality and erosion characters in dry valley of the upper Minjiang River[D]. Yangling: Northwest A & F University, 2012.
Zhao G G, Zhang D P, Yuan D G, et al. Genetic characteristics and taxonomy of soils in zagunao area in upper reaches of Minjiang River[J]. Soils, 2022, 54(4):865-872.
Yang Z S, Yang C, Li Y X. Stability of plant communities on waste hillsides of dry valleys in the upper reaches of Minjiang River[J]. Journal of Ecology and Rural Environment, 2013, 29(1):43-48.
Liu Y, Li P, Xu Y, et al. Quantitative classification and ordination for plant communities in dry valleys of Southwest China[J]. Biodiversity Science, 2016, 24(4):378-388.
doi: 10.17520/biods.2015241
He S Q, Gong Y B, Zheng Z C. Water conservation capacity of litters in different vegetation restoration patterns in the upper reaches of Minjiang River[J]. Resources and Environment in the Yangtze Basin, 2020, 29(9):1986-1994.
Zhang L, Xu Z, Shan F J, et al. Characteristics of plant diversity under different vegetation restoration models in the arid valley of the Minjiang River[J]. Journal of Sichuan Forestry Science and Technology, 2022, 43(5):34-40.
He S Q. Study on soil ecological function of different vegetation restoration patterns in mountain forests-arid valley ecotone[D]. Yaan: Sichuan Agricultural University, 2019.
Li X K, Huang Y Q, Su Z M, et al. Characteristics of natural content of elements in rocks and soils of different strata in Longan County[J]. Guangxi Sciences, 1997, 4(2):6.
Li Z J. Large-scale system of rock-soil-plant[J]. Geological Review, 1996, 42(4):369-372.
[14]
Bern C R. Influence of tectonics and atmospheric deposition on nutrient sources to tropical forests of the Osa peninsula,Costa Rica[D]. Boulder: University of Colorado, 2006.
Xiao C L, Nie H F, Liu J Y, et al. Ecological and geological interaction model:The coupling of supergene geological processes and ecological characteristics[J]. Geological Survey of China, 2021, 8(6):9-24.
Yan M C, Gu T X, Chi Q H, et al. Abundance of chemical elements of soils in China and supergenesis geochemistry characteristics[J]. Geophysical and Geochemical Exploration, 1997, 21(3):161-167.
Zhang T L, Zhao Q G. The genetic properties of soils in arid tropical and subtropical regions of China[J]. Acta Pedologica Sinica, 1990, 27(2):207-218,237-238.
[20]
Nesbitt H W, Young G M. Early Proterozoic climates and plate motions inferred from major element chemistry of lutites[J]. Nature, 1982,299:715-717.
[21]
McLennan S M. Weathering and global denudation[J]. The Journal of Geology, 1993, 101(2):295-303.
Xu L F, Wei J, Jiang W. The weathering characteristics of the reticulate red clay in southern Anhui Province and its paleo-environmental significance[J]. Chinese Journal of Soil Science, 2010, 41(1):7-12.
[23]
迟清华, 鄢明才. 应用地球化学元素丰度数据手册[M]. 北京: 地质出版社, 2007.
[23]
Chi Q H, Yan M C. Handbook of elemental abundance for applied geochemistry[M]. Beijing: Geological Publishing House, 2007.
Department of Science and Technology Standards,Ministry of Environmental Protection. The complete book of Chinese environmental protection standards 2007-2008[M]. Beijing: China Environmental Science Press, 2008.
[25]
臧楠. 川西杂谷脑河流域黄土特征及成因分析[D]. 成都: 成都理工大学, 2021.
[25]
Zang N. Characteristics and genetic analysis of loess in zagnao river basin,western sichuan[D]. Chengdu: Chengdu University of Technology, 2021.
[26]
Fedo C M, Nesbitt H W, Young G M. Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols,with implications for paleoweathering conditions and provenance[J]. Geology, 1995, 23(10):921.
Gou M Z, Wen X Y, Wu Y, et al. Physical and chemical characteristics of soils in the yingpanshan site and its environmental significance[J]. Earth and Environment, 2019, 47(4):477-484.
Li X S, Han Z Y, Yang S Y, et al. Chemical weathering intensity and element migration characteristics of Xiashu soil profile in Zhenjiang[J]. Acta Geographica Sinica, 2007, 62(11):1174-1184.
Gu T, Zheng X Z, Qiu X F, et al. Element geochemical characteristics of Mesozoic granite weathering crust profile in Shenwan town,Zhongshan city[J]. South China Geology, 2021, 37(4):406-417.
Hao L B, Ma L, Zhao H B. Elemental homogenization during weathering and pedogenesis of volcanic rocks from North Da Hinggan Ling[J]. Geochimica, 2004, 33(2):131-138.
Han Z X, Li M, Duan A L, et al. Influencing factors of heavy metal transport and migration in mining area soil:A review[J]. Applied Chemical Industry, 2023, 52(6):1891-1895.
Wang H R, Hou Q Y, Yang Z F, et al. Vertical distribution of some elements in typical weathering-soil profiles of granite in Guangdong Province[J]. Geology in China, 2013, 40(2):619-628.
[34]
FZ/T 92025—1994土地质量生态地球化学评价规范[S].
[34]
FZ/T 92025—1994 Code for ecological geochemical evaluation of land quality[S].