模拟酸雨淋溶下不同母质发育雏形土矿物风化中的盐基离子与硅计量关系
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1.中国科学院南京土壤研究所,中国科学院大学;2.中国科学院南京土壤研究所,中国科学院大学,中国科学院地理与湖泊研究所

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国家自然科学基金项目(41877010、41471176、U1901601)


Stoichiometry of Base Cations and Silicon of Cambosols Derived from Different Parent Materials as Leached by Simulated Acid Rain
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Affiliation:

1.Institute of Soil Science, Chinese Academy of Sciences;2.University of Chinese Academy of Sciences;3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences

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National Natural Science Foundation of China (Nos. 41877010,41471176,U1901601)

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    摘要:

    土壤矿物风化过程中释放的盐基离子(BC)与硅(Si)的比值(BC:Si)是定量评估土壤矿物风化对土壤酸化过程缓冲作用的基础,是准确估算当前环境下土壤酸化速率的依据。本研究以云母片岩、片麻岩和安山岩3种母质发育的湿润雏形土为研究对象,测定了其土壤物理、化学和矿物学性质。通过洗脱实验除去土壤交换性盐基以消除土壤胶体吸附的交换性盐基离子对矿物风化计量关系的影响,再利用模拟酸雨淋溶实验,采用Batch方法获取3种不同母质土壤的盐基离子和硅的释放量,进一步估算BC:Si值。结果表明,由于母岩不同,土壤黏粒、pH、有机质、交换性盐基(K+、Na+、Ca2+和Mg2+)、阳离子交换量(CEC)和土壤矿物的含量及层间分布特征存在差异。在模拟酸雨淋溶实验条件下,未洗脱盐基土壤的BC:Si值是洗脱盐基土壤的3倍以上,因此只有洗脱土壤交换性盐基才能获得来自风化过程的BC:Si值。同一母质发育土壤的腐殖质表层(Ah)BC:Si最小,母质层(C)最大。不同母质发育土壤的BC:Si值表现为:片麻岩>云母片岩>安山岩,土壤中斜长石、伊利石、绿泥石和蛭石的含量控制了各自BC:Si的大小。因此,不同起源母质发育的雏形土应在得到各自相应风化计量关系的基础上,才可准确评估其对酸化过程的响应程度。该成果可为区域土壤酸化速率评价提供数据支撑。

    Abstract:

    【Objective】The stoichiometry of base cations and silicon (BC:Si) can quantify the impact of soil mineral weathering on soil acidification process, which plays an important role in quantifying soil acidification rate in the current environment. The purpose of this research is to explore the BC:Si difference and its causes in Udic Cambosols derived from three parent materials of Mica schist, Gneiss and Andesite.【Method】First of all, the physical, chemical and mineralogical properties of test soils were measured, and then the release of base cations and silicon of soils derived from three parent materials were obtained by Batch method under leaching of simulated acid rain. In order to avoid the influence of base cations adsorbed by soil colloid on the stoichiometry of mineral weathering process, the soil exchangeable base cations were washed by elution experiments.【Result】The results showed that content and distribution in profile of clay, pH, organic matters, exchangeable base cations (K+, Na+, Ca2+, Mg2+), cation exchange capacity (CEC) and mineral compositions were significant differences due to different parent materials. During simulated acid rain leaching, BC:Si values of base-uneluted soils were three times more than that of base-eluted soils. Only when the exchangeable base cations adsorbed by soil colloid were eluted can obtain accurate BC:Si values.【Conclusion】The smallest BC:Si value was in humus surface horizon (Ah) in the same soil profile with different soil genetic horizons and the largest BC:Si value was in parent materials horizon (C). BC:Si value of Udic Cambosols derived from different parent materials soils is: Gneiss > Mica schist > Andesite. The mineral proportions of plagioclase, illite, chlorite, and vermiculite in soils controlled the BC:Si values. Therefore, only on the basis of corresponding BC:Si, the response degree of Cambosols with different parent materials to acidification process can be accurately evaluated. The results can provide data support for soil acidification rate evaluation regionally.

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赵越,杨金玲,许哲,张甘霖.模拟酸雨淋溶下不同母质发育雏形土矿物风化中的盐基离子与硅计量关系[J].土壤学报,,[待发表]
Zhao Yue, Yang Jinling, Xu Zhe, Zhang Ganlin. Stoichiometry of Base Cations and Silicon of Cambosols Derived from Different Parent Materials as Leached by Simulated Acid Rain[J]. Acta Pedologica Sinica,,[In Press]

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