Canopy influence on trace metal atmospheric inputs on forest ecosystems: Speciation in throughfall

Atmospheric inputs of selected Trace Metals (TM: Cd, Cu, Ni, Pb, Sb, Zn, as well as Al, Fe and Mn) were studied on six forested sites in France. In order to evaluate canopy interaction with atmospheric inputs, TM were measured in both Open Field Bulk Deposition (BD) and Throughfall (TF). Anthropogenic contribution to BD composition is high for Zn, Cd and Sb, reflecting actual TM emissions trends. Canopy greatly influences precipitation composition, through different processes, including assimilation and leaching by canopy, complexation as well as accumulation/dissolution of dry deposition. TM and Dissolved Organic Carbon (DOC) physical fractionation between colloidal and truly dissolved phases was performed with ultrafiltration. Al, Fe, Pb and Cu are found in the colloidal fraction whereas Cd, Ni, Zn and Sb are mostly in the truly dissolved fraction. Chemical speciation predicted with WHAM-VI shows that in throughfall, Al, Fe, Pb and Cu are almost entirely complexed by DOC, whereas Ni, Cd and Zn are present in average 30% in the free metal ion form. TM present in labile forms (Cd, Ni, Zn) interact with the canopy, are cycled in the ecosystem, and their concentration is either slightly increased or even decreased in throughfall. Sb, Pb and Cu concentration are increased through canopy, as a consequence of dry deposition accumulation.

[1]  Scott M. McLennan,et al.  Relationships between the trace element composition of sedimentary rocks and upper continental crust , 2001 .

[2]  C. Dumat,et al.  Modelling trace metal extractability and solubility in French forest soils by using soil properties , 2010 .

[3]  Jozef M. Pacyna,et al.  Earth's global Ag, Al, Cr, Cu, Fe, Ni, Pb, and Zn cycles , 2009 .

[4]  G. Lovett,et al.  Atmospheric Deposition and Canopy Interactions of Major Ions in a Forest , 1986, Science.

[5]  J. Galloway,et al.  Trace metals in atmospheric deposition: A review and assessment , 1982 .

[6]  S. Passy,et al.  Changes in stream chemistry and biology in response to reduced levels of acid deposition during 1987–2003 in the Neversink River Basin, Catskill Mountains , 2008 .

[7]  O. Pourret,et al.  Competition between humic acid and carbonates for rare earth elements complexation. , 2007, Journal of colloid and interface science.

[8]  M. Hosomi,et al.  Trace metals in bulk precipitation and throughfall in a suburban area of Japan , 2005 .

[9]  M. Narayan,et al.  The biochemistry of environmental heavy metal uptake by plants: implications for the food chain. , 2009, The international journal of biochemistry & cell biology.

[10]  D. Fisher,et al.  Increasing atmospheric antimony contamination in the northern hemisphere: snow and ice evidence from Devon Island, Arctic Canada. , 2005, Journal of environmental monitoring : JEM.

[11]  Arctic Canadaw.  Increasing atmospheric antimony contamination in the northern hemisphere: snow and ice evidence from Devon Island, , 2005 .

[12]  A. Rodrigo,et al.  Dry Deposition to the Forest Canopy and Surrogate Surfaces in Two Mediterranean Holm Oak Forests in Montseny (NE Spain) , 2002 .

[13]  S. Lofts,et al.  Validation of Transfer Functions Predicting Cd and Pb Free Metal Ion Activity in Soil Solution as a Function of Soil Characteristics and Reactive Metal Content , 2007 .

[14]  A. Granier,et al.  Interception in a mountainous declining spruce stand in the Strengbach catchment (Vosges, France) , 1993 .

[15]  O. Pokrovsky,et al.  Trace element fractionation and transport in boreal rivers and soil porewaters of permafrost-dominated basaltic terrain in Central Siberia , 2006 .

[16]  M. H. Back,et al.  Chemical speciation of Cu, Zn, Pb and Cd in rain water , 1994 .

[17]  C. Neal.  Interception and attenuation of atmospheric pollution in a lowland ash forested site, Old Pond Close, Northamptonshire, UK. , 2002, The Science of the total environment.

[18]  J. Derome,et al.  Interactions between precipitation and Scots pine canopies along a heavy-metal pollution gradient. , 1999, Environmental pollution.

[19]  A. J. Friedland,et al.  Metal contamination of natural surface soils from long-range atmospheric transport: Existing and missing knowledge , 2006 .

[20]  Montserrat Filella,et al.  Antimony in the environment: a review focused on natural waters: I. Occurrence , 2002 .

[21]  J. Pacyna,et al.  An assessment of global and regional emissions of trace metals to the atmosphere from anthropogenic sources worldwide , 2001 .

[22]  B. Bergamaschi,et al.  Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon. , 2003, Environmental science & technology.

[23]  S. Miura,et al.  Atmospheric lead and cadmium deposition within forests in the Kanto district, Japan , 2006, Journal of Forest Research.

[24]  A. Rodrigo,et al.  The chemistry of precipitation, throughfall and stemflow in two holm oak (Quercus ilex L.) forests under a contrasted pollution environment in NE Spain. , 2003, The Science of the total environment.

[25]  R. Qualls,et al.  Soluble Organic and Inorganic Nutrient Fluxes in Clearcut and Mature Deciduous Forests , 2000 .

[26]  B. Ambroise,et al.  Hydrochemical budgets of a small forested granitic catchment exposed to acid deposition: The strengbach catchment case study (Vosges massif, France) , 1992 .

[27]  Natural organic matter contribution to throughfall acidity in French forests , 1998 .

[28]  B. Singh,et al.  Tannin levels in leaves of some oak species at different stages of maturity , 1991 .

[29]  J. La Roche,et al.  Trace Metals in the Oceans: Evolution, Biology and Global Change , 2003 .

[30]  S. Lindberg,et al.  An intensive 1-month investigation of trace metal deposition and throughfall at a mountain spruce forest , 1990 .

[31]  E. Tipping.  Humic Ion-Binding Model VI: An Improved Description of the Interactions of Protons and Metal Ions with Humic Substances , 1998 .

[32]  P. Kindlmann,et al.  Temporal fluctuations in throughfall carbon concentrations in a spruce forest , 2004 .

[33]  Gary M. Lovett,et al.  Dry deposition and canopy exchange in a mixed oak forest as determined by analysis of throughfall , 1984 .

[34]  M. Hosomi,et al.  Copper Complexing Capacity of Throughfall and its Environmental Effect , 2005 .

[35]  M. Davranche,et al.  Insights into colloid-mediated trace element release at the soil/water interface. , 2008, Journal of colloid and interface science.

[36]  M. Rogora,et al.  Dry deposition of particles and canopy exchange: Comparison of wet, bulk and throughfall deposition at five forest sites in Italy , 2007 .

[37]  J. Kramers,et al.  Two thousand years of atmospheric arsenic, antimony, and lead deposition recorded in an ombrotrophic peat bog profile, Jura Mountains, Switzerland , 1996 .

[38]  M. A. Arain,et al.  Concentrations and fluxes of dissolved organic carbon in an age-sequence of white pine forests in Southern Ontario, Canada , 2007 .

[39]  R. Duce,et al.  Atmospheric Trace Metals at Remote Northern and Southern Hemisphere Sites: Pollution or Natural? , 1975, Science.

[40]  Herbert E. Allen,et al.  Solid-Solution Partitioning of Metals in Contaminated Soils: Dependence on pH, Total Metal Burden, and Organic Matter , 2000 .

[41]  I Thornton,et al.  The solid-solution partitioning of heavy metals (Cu, Zn, Cd, Pb) in upland soils of England and Wales. , 2003, Environmental pollution.

[42]  B. Michalzik,et al.  Importance of canopy herbivores to dissolved and particulate organic matter fluxes to the forest floor , 2005 .

[43]  L. Poissant,et al.  Trace inorganic elements in rainfall in the Montreal Island , 1994 .

[44]  J. Neirynck,et al.  Calculating Dry Deposition and Canopy Exchange with the Canopy Budget Model: Review of Assumptions and Application to Two Deciduous Forests , 2008 .

[45]  Study on throughfall deposition in two north Italian forest sites (Valtellina, Lombardy) , 1998 .

[46]  Jerome O. Nriagu,et al.  A global assessment of natural sources of atmospheric trace metals , 1989, Nature.

[47]  A. Jenkins,et al.  Response of acid lakes in the UK to reductions in atmospheric deposition of sulfur. , 2003, The Science of the total environment.