Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jaridenv.2005.06.003 |
Secondary CaCO3 and precipitation of P-Ca compounds control the retention of soil P in arid ecosystems | |
Carreira, JA; Vinegla, B; Lajtha, K | |
通讯作者 | Vinegla, B |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS
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ISSN | 0140-1963 |
EISSN | 1095-922X |
出版年 | 2006 |
卷号 | 64期号:3页码:460-473 |
英文摘要 | The adsorption and precipitation of P onto pure calcite led to hypothesize carbonate contributes to P retention in calcareous soils. However, most studies have shown that Al-Fe oxyhydroxides overwhelm the role of carbonate in P adsorption, even in calcareous soils. A previous study of arid region soils with aeolian-derived carbonate from New Mexico supported the hypothesis that the carbonate phase may control adsorption. In batch experiments with CaCl2 as background electrolyte, carbonate was selected as the most contributing variable in regression analyses between soil properties and P sorption. We later suspected that the choice of electrolyte might have biased this result. We found that even diluted CaCl2 enhanced P sorption and the precipitation of calcium phosphate compounds in calcareous soils. In this study we re-examined factors controlling P sorption in arid, pedogenic carbonate-rich soils by: (i) determining if calcite appears to control P adsorption when an electrolyte other than CaCl2 is used, and (ii) correlating microscale concentrations of P and Ca by applying electron microprobe analysis (EMA) to intact soil thin sections. Carbonate was always selected by multiple regression as the most contributing variable, irrespective of the electrolyte choice. Chemical fractionation of bulk samples showed that the largest fraction was HCl-extractable P (Ca-bound P). Microprobe analysis showed that in situ P concentrations were locally higher in carbonate coatings, and that P distribution in microtransects through soil aggregates was positively correlated with that of Ca and F. However. P distribution did not correlate with that of Fe, Al and Si. Results confirmed that accumulation of secondary, aeolian-derived and high-specific surface area, calcium carbonate is the primary geochemical agent capable of fixation and retention of P within the soil profile in this arid environment. (c) 2005 Elsevier Ltd. All rights reserved. |
英文关键词 | adsorption aeolian carbonate arid soil phosphorus XRD-electron microprobe analysis |
类型 | Article |
语种 | 英语 |
国家 | USA ; Spain |
收录类别 | SCI-E |
WOS记录号 | WOS:000234779700008 |
WOS关键词 | AFFECTING PHOSPHATE SORPTION ; CALCAREOUS VERTISOLS ; CALCIUM-CARBONATE ; IRON-OXIDES ; PHOSPHORUS ; ADSORPTION ; INCEPTISOLS ; ELEMENTS |
WOS类目 | Ecology ; Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/151881 |
作者单位 | (1)Boston Univ, Dept Biol, Boston, MA 02215 USA;(2)Univ Malaga, Dept Ecol & Geol, Fac Ciencias, E-29071 Malaga, Spain |
推荐引用方式 GB/T 7714 | Carreira, JA,Vinegla, B,Lajtha, K. Secondary CaCO3 and precipitation of P-Ca compounds control the retention of soil P in arid ecosystems[J],2006,64(3):460-473. |
APA | Carreira, JA,Vinegla, B,&Lajtha, K.(2006).Secondary CaCO3 and precipitation of P-Ca compounds control the retention of soil P in arid ecosystems.JOURNAL OF ARID ENVIRONMENTS,64(3),460-473. |
MLA | Carreira, JA,et al."Secondary CaCO3 and precipitation of P-Ca compounds control the retention of soil P in arid ecosystems".JOURNAL OF ARID ENVIRONMENTS 64.3(2006):460-473. |
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