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Effects of elevated atmospheric CO2 on dissolution of geological fluorapatite in water and soil.
- Source :
-
Science of the Total Environment . Dec2017, Vol. 599, p1382-1387. 6p. - Publication Year :
- 2017
-
Abstract
- Most of phosphorus (P) is present as insoluble phosphorus-bearing minerals or organic forms in soil. Geological fluorapatite (FAp) is the dominant mineral-weathering source of P. In this study, FAp was added into water and soil under elevated CO 2 to investigate the pathway of P release. Two types of soils (an acidic soil from subtropical China and a saline-alkali soil from Tibet Plateau, China) with similar total P content were studied. In the solution, increased CO 2 in air enhanced the dissolution of FAp, i.e., from 0.04 to 1.18 ppm for P and from 2.48 to 13.61 ppm for Ca. In addition, release of Ca and P from FAp reached the maximum (2.14 ppm for P and 13.84 ppm for Ca) under the combination of elevated CO 2 and NaCl due to the increasing ion exchange. Consistent with the results from the solution, CO 2 elevation promoted P release more significantly (triple) in the saline-alkali soil than in the acidic soil. Therefore, saline-alkali soils in Tibet Plateau would be an important reservoir of available P under the global CO 2 rise. This study sheds the light on understanding the geological cycle of phosphorus. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00489697
- Volume :
- 599
- Database :
- Academic Search Index
- Journal :
- Science of the Total Environment
- Publication Type :
- Academic Journal
- Accession number :
- 123572578
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2017.05.100