Arid
DOI10.1016/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
ISSN0140-1963
EISSN1095-922X
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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