DOI: 10.1002/gbc.20019
Scopus记录号: 2-s2.0-84878596219
论文题名: Phosphorus fertilization by active dust deposition in a super-humid, temperate environment - Soil phosphorus fractionation and accession processes
作者: Eger A ; , Almond P ; C ; , Condron L ; M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 1 起始页码: 108
结束页码: 118
语种: 英语
英文关键词: biosphere/atmosphere interactions
; dust deposition
; New Zealand
; soil phosphorus
; upbuilding pedogenesis
Scopus关键词: Braided river
; Depth distribution
; Dust deposition
; New zealand
; Organic surfaces
; Soil phosphorus
; Soil phosphorus fractionations
; Upbuilding pedogenesis
; Apatite
; Deposition
; Dust
; Leaching
; Minerals
; Phosphorus
; Soils
; atmospheric deposition
; biomass
; concentration (composition)
; dust
; fertilizer application
; fractionation
; humid environment
; leaching
; mineral
; phosphorus
; soil organic matter
; temperate environment
英文摘要: The inventory of soil phosphorus (P) is subject to significant changes over time. The main primary form, bedrock-derived apatite P, becomes progressively lost through leaching, or transformed into more immobile and less plant-accessible, secondary organic and mineral forms. Here we studied the rejuvenating effect of dust deposition on soil P along an active dust flux gradient downwind of a braided river. Along the gradient, we measured soil P fractions to 50 cm depth of six Spodosols and one Inceptisol, supplemented by tree foliage P concentrations. While an increasing dust flux correlates with a twofold increase of foliar P and soil organic P along the gradient, apatite P declines from ~50 to 3 g m-2 and total P shows no response. Compared to dust-unaffected Spodosols, depth distribution of total P becomes increasingly uniform and organic P propagates deeper into the soil under dust flux. Further, the effect of topsoil P eluviation attenuates due to higher organic P content and the zone of high apatite P concentrations associated with un-weathered subsoil becomes progressively removed from the upper 50 cm. We interpret these patterns as being consistent with upbuilding pedogenesi and conclude that dust-derived mineral P is assimilated in the organic surface horizon and does not reach the mineral soil. Dust-derived mineral P is temporarily stored in the living biomass and returns to the soil with plant and microbial detritus as organic P, which is subsequently buried by further dust increments. We further conclude that (1) the efficiency of P fertilization of the ecosystem by dust accession is higher than through P advection in dust-unaffected Spodosols and (2) organic P may serve as an important source of labile P in a high-leaching environment. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77628
Appears in Collections: 气候变化事实与影响
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作者单位: Faculty of Agriculture and Life Sciences, Department of Soil and Physical Sciences, Lincoln University, PO Box 84, Lincoln Canterbury, New Zealand
Recommended Citation:
Eger A,, Almond P,C,et al. Phosphorus fertilization by active dust deposition in a super-humid, temperate environment - Soil phosphorus fractionation and accession processes[J]. Global Biogeochemical Cycles,2013-01-01,27(1)