Ca-H-Al exchanges and aluminium mobility in two Chinese acidic forest soils: a batch experiment

doi:10.1007/s00254-004-0979-2

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 土壤环境科学实验室

	Ca-H-Al exchanges and aluminium mobility in two Chinese acidic forest soils: a batch experiment
	Seip, HM; Guo, J; Vogt, RD; Zhang, X; Zhang, Y; Tang, H
刊名	ENVIRONMENTAL GEOLOGY
	2004
卷号	45 期号:8 页码:1148-1153
关键词	Acidification Exchange Reactions Aluminium Mobility Base Cations Chinese Acidic Forest Soils
DOI	10.1007/s00254-004-0979-2
英文摘要	Exchange reactions between Ca2+, H+ and Al species and their effects on the aluminium mobility in two Chinese acidic forest soils were studied. The study was based on a batch experiment using extractant solutions with different base cation (calcium) concentrations and pH. The experimental data showed that increased Ca2+ concentrations increased the release of soil hydrogen-and aluminium ions, especially from the more acid soil. In agreement with a cation exchange process, the treatment with Ca2+ extracts gave significantly decreased soil aluminium saturation (AlS) and increased calcium saturation (CaS) on the ion exchanger. Geochemical calculation using AlCHEMI program showed that activities of Al3+ in the extracts were all strongly under-saturated with respect to any gibbsite mineral in the studied pH region (i.e. below 4.1). There were instead apparently two different mechanisms controlling the activities of Al3+ in extracts. At pH between about 4.1 and 3.7, the Al3+ activity did not change significantly with pH. This is especially the case in the more acid soil. Apparently there are no sizeable pools available to release Al in this pH region. At pH below 3.7 (induced by higher Ca(2+)concentration) the activity of Al3+ increased with H+ though not in a pattern that complies with a gibbsite solubility control. An increase of base cation deposition would therefore mainly enhance the release of hydrogen ions between pH 4.1 and 3.7 and aluminium ions below pH 3.7 from Chinese mature acidic soils. This will cause an increased acidity of soil water in the short term and a decrease in the soil acidity in the long term. More attention should be paid to this fact in Chinese acid rain studies and control options.
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
WOS记录号	WOS:000221884500012
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/23564]
专题	生态环境研究中心_土壤环境科学实验室
推荐引用方式 GB/T 7714	Seip, HM,Guo, J,Vogt, RD,et al. Ca-H-Al exchanges and aluminium mobility in two Chinese acidic forest soils: a batch experiment[J]. ENVIRONMENTAL GEOLOGY,2004,45(8):1148-1153.
APA	Seip, HM,Guo, J,Vogt, RD,Zhang, X,Zhang, Y,&Tang, H.(2004).Ca-H-Al exchanges and aluminium mobility in two Chinese acidic forest soils: a batch experiment.ENVIRONMENTAL GEOLOGY,45(8),1148-1153.
MLA	Seip, HM,et al."Ca-H-Al exchanges and aluminium mobility in two Chinese acidic forest soils: a batch experiment".ENVIRONMENTAL GEOLOGY 45.8(2004):1148-1153.