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| 湖南洞庭湖地区土壤酸化特征及机理研究 | |
| 引用本文： | 杨忠芳,余涛,唐金荣,朱翠娟,宗思锋,张娇,张建新,申志军.湖南洞庭湖地区土壤酸化特征及机理研究[J].地学前缘,2006,13(1):105-112. |
| 作者姓名： | 杨忠芳 余涛 唐金荣 朱翠娟 宗思锋 张娇 张建新 申志军 |
| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院,北京,100083 2. 中国地质调查局,发展研究中心,北京,100037 3. 湖南省地质研究所,湖南,长沙,410007 |
| 基金项目： | 中国地质调查局地质调查项目;中国农业生态地球化学评价体系研究与成果集成项目;湖南省洞庭湖农业生态地球化学评价项目 |
| 摘 要： | 湖南省洞庭湖地区是中国酸雨沉降和土壤酸化严重的地区之一,酸雨沉降具有明显的季节性和地域性差异,酸雨沉降与土壤酸化具有较好的空间对应性,但土壤酸化的程度还取决于土壤中盐基离子的含量。在土壤酸化较严重的地区,垂向上,土壤酸化深度已达50cm左右,土壤酸化伴随着大量的可溶性铝的溶出。在土壤pH值与盐基离子、氮和硫含量的关系曲线上,存在着pH值突变的临界点(临界点pH值为8),在碱性范围内,硅酸盐和铝硅酸盐矿物的水解使大量盐基离子溶出,中和了因SO42-和NO3-的输入而造成的土壤酸化,但当pH值下降到小于7·25的中酸性范围时,酸性物质和碱性物质组成的土壤缓冲体系失去缓冲作用,酸性物质略有增加,就会导致土壤迅速酸化。 |
| 关 键 词： | 土壤酸化 盐基离子 缓冲作用 |
| 文章编号： | 1005-2321（2006）01-0105-08 |
| 收稿时间： | 2005-10-21 |
| 修稿时间： | 2005-11-22 |
A study of the characteristics and mechanisms of soil acidification in the Dongting Lake region in Hunan Province, South China |
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| YANG Zhong-fang,YU Tao,TANG Jin-rong,ZHU Cui-juan,ZONG Si-feng,ZHANG Jiao,ZHANG Jian-xin,SHEN Zhi-jun.A study of the characteristics and mechanisms of soil acidification in the Dongting Lake region in Hunan Province, South China[J].Earth Science Frontiers,2006,13(1):105-112. | |
| Authors: | YANG Zhong-fang YU Tao TANG Jin-rong ZHU Cui-juan ZONG Si-feng ZHANG Jiao ZHANG Jian-xin SHEN Zhi-jun |
| Institution: | 1. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China ;2. The Centre of Development and Research, Geological Survey of China, Beijing 100037, China; 3. Geological Institute of Hunan , Changsha 410007, China |
| Abstract: | Acid deposition and soil acidification occur more severely in the Dongting Lake region in Hunan Province, South China. Acid deposition appears to be seasonal. Regional differences show a close spatial correlation with soil acidification, whereas the extent of soil acidification depends on the content of electropositive ions. In severely acidified areas, soil acidification may occur at a depth of about 50 cm, and much AI dissolves out along with the soil acidification. There is a critical point on the curve of soil pH vs. the content of basic cations, S and N, which is corresponding to a pH of 8. In alkaline conditions, a large quantity of basic cations is dissolved owing to the hydrolysis of silicates and aluminosilicates. Hence the soil acidity that is due to the input of SO4^2- and NO3^- is neutralized. However, when the pH is below 7.25, the buffer system set up by acid and alkaline materials in soil is no longer effective. A little increase of acid material will rapidly trigger the soil acidification. |
| Keywords: | soil acidification basic catiom buffering |
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