作者: B. K�stner
关键词: Environmental science 、 Atmospheric sciences 、 Understory 、 Fagus sylvatica 、 Scots pine 、 Picea abies 、 Transpiration 、 Tree canopy 、 Forest floor 、 Beech
摘要: Spatial scaling from patch to the landscape level requires knowledge on effects of vegetation structure maximum surface conductances and evaporation rates. The following paper summarizes results atmospheric, edaphic, structural controls forest transpiration observed in stands Norway spruce (Picea abies), Scots pine (Pinus sylvestris) European beech (Fagus sylvatica). Forest canopy (E c ) was determined by tree sapflow measurements scaled stand level. Estimates understory floor were derived lysimeter chamber measurements. Strong reduction E due soil drought only at a when scil water content dropped below 16% v/v. Although relative responses atmospheric conditions similar, daily rates z cmax could differ more than 100% between patches different (1.5-3.0mmd -1 2.6-6.4 mmd for beech, respectively). A significant decrease per leaf area index /LAI) with increasing age found monocultures spruce, whereas no pronounced changes /LAI stands. It is concluded that can be specified must considered spatial landscapes. Hereby, conjunction LAI, age-related parameters are important compensating layers total forests observed, information needed quantify structure-function relationships heterogenous structure.