TY - JOUR

T1 - A NEW METHOD FOR ESTIMATION OF DRY DEPOSITION OF PARTICLES BASED ON THROUGHFALL MEASUREMENTS IN A FOREST EDGE

AU - Beier, Claus

AU - Gundersen, Per

AU - Rasmussen, Lennart

PY - 1992

Y1 - 1992

N2 - Throughfall measurements are very often used to calculate the atmospheric input to ecosystems. Such attempts are normally complicated by canopy interaction processes which are difficult to assess. This study presents an approach to calculate dry deposition and canopy leaching of Ca2+, Mg2+ and K+ to forests. The calculations are based on throughfall measurements in a forest edge of a spruce stand and by use of Na+ as a model substance for dry deposition of particles. This ‘forest edge approach’ is compared with an approach based on equal Na+ to base cation ratios in wet and dry deposition (‘wet/dry ratio approach’), which has been widely used in the literature. Our calculations show that the wet/dry ratio approach may overestimate the dry deposition of Ca2+, Mg2+ and K+ by up to 100% and leaching will correspondingly be underestimated. The assumptions underlying the different approaches and the use of throughfall measurements to estimate dry deposition are discussed and it is suggested that throughfall measurements in forest edges may be a valuable improvement to studies of atmospheric deposition in forests.

AB - Throughfall measurements are very often used to calculate the atmospheric input to ecosystems. Such attempts are normally complicated by canopy interaction processes which are difficult to assess. This study presents an approach to calculate dry deposition and canopy leaching of Ca2+, Mg2+ and K+ to forests. The calculations are based on throughfall measurements in a forest edge of a spruce stand and by use of Na+ as a model substance for dry deposition of particles. This ‘forest edge approach’ is compared with an approach based on equal Na+ to base cation ratios in wet and dry deposition (‘wet/dry ratio approach’), which has been widely used in the literature. Our calculations show that the wet/dry ratio approach may overestimate the dry deposition of Ca2+, Mg2+ and K+ by up to 100% and leaching will correspondingly be underestimated. The assumptions underlying the different approaches and the use of throughfall measurements to estimate dry deposition are discussed and it is suggested that throughfall measurements in forest edges may be a valuable improvement to studies of atmospheric deposition in forests.

KW - DRY DEPOSITION

KW - CANOPY LEACHING

KW - THROUGHFALL

KW - FOREST EDGE

U2 - 10.1016/0960-1686(92)90055-P

DO - 10.1016/0960-1686(92)90055-P

M3 - Journal article

VL - 26

SP - 1553

EP - 1559

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 0004-6981

IS - 9

ER -