贵州贞丰-关岭花江喀斯特石漠化过程中岩土体化学元素含量与石漠化差异性关系研究

不同等级石漠化地区岩体和土体中化学元素有较大的差异,表现在石漠化演化过程中不断被改变,化学元素的差异性对石漠化等级差异性的形成有着内在的关联性。文章以贵州贞丰-关岭花江石漠化治理示范区为研究区,选取11处样地的岩石样和土样,对其进行室内实验分析,以了解该地区岩石和土壤的化学元素含量,从而研究其含量的差异性与石漠化等级之间的关系。结果显示:1岩体中CaO/MgO的值越大,Rb/Sr值越低,石漠化等级越高。2在碳酸盐母岩逐渐溶蚀和风化成土的过程中,岩体中Ca、Mg离子被带走,导致成土后土体中Ca、Mg离子含量降低,但强度石漠化地区的土体中Mg离子含量却增加。3不同等级石漠化地区的样品化学元素流失和...

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Published in中国岩溶 Vol. 35; no. 5; pp. 533 - 538
Main Author 顾展飞 刘琦 卢耀如
Format Journal Article
LanguageChinese
Published 同济大学土木工程学院地下建筑与工程系,上海,200092%教育部城市环境与可持续发展联合研究中心,上海,200092 2016
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Summary:不同等级石漠化地区岩体和土体中化学元素有较大的差异,表现在石漠化演化过程中不断被改变,化学元素的差异性对石漠化等级差异性的形成有着内在的关联性。文章以贵州贞丰-关岭花江石漠化治理示范区为研究区,选取11处样地的岩石样和土样,对其进行室内实验分析,以了解该地区岩石和土壤的化学元素含量,从而研究其含量的差异性与石漠化等级之间的关系。结果显示:1岩体中CaO/MgO的值越大,Rb/Sr值越低,石漠化等级越高。2在碳酸盐母岩逐渐溶蚀和风化成土的过程中,岩体中Ca、Mg离子被带走,导致成土后土体中Ca、Mg离子含量降低,但强度石漠化地区的土体中Mg离子含量却增加。3不同等级石漠化地区的样品化学元素流失和富集的程度略有差异,一般强度和潜在石漠化地区(离子)含量要高于轻度和中度石漠化地区。4土体中Rb/Sr值越大,石漠化等级越强。该研究可以为示范区的水土流失及石漠化治理提供理论和实践依据。
Bibliography:GU Zhanfei, LIU Qi, LU Yaoru (1. Department of Geotechnical Engineering, college of civil engineering, Tongji University, Shanghai 200092, China; 2. Joint Researeh Center of Urban Environment and Sustainable Development, Ministry of Education, Shanghai 200092. China)
45-1157/P
karst area, rock desertification, water and soil loss, chemical element, differences
The Zhenfeng-Guanling--Huajiang rock desertification demonstration area is a typical karst canyon in Guizhou, where the water and soil losses are serious and many places have suffered from intense rocky desertification. In order to study the intensity and diversity of rocky desertification in the area, llrock and soil samples from the 11 quadrats in the demonstration were collected and their chemical compositions were analysed. The results show that, (1) When the ratio of CaO/MgO in rock is larger and ratio of Rb/Sr is lower, the level of rocky desertification is higher. It means the strength of rocky desertification increases with the ratio of CaO/MgO inc
ISSN:1001-4810
DOI:10.11932/karst20160509