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Importance of overstorey attributes for understorey litter production and nutrient cycling in European forests

Forest Ecosystems 2020年第4期7卷 591-601页

作者： Dries Landuyt Evy Ampoorter cristina cbastias Raquel Benavides Sandra Müller Michael Scherer-Lorenzen Fernando Valladares Safaa Wasof Kris Verheyen Forest&Nature Lab Department of EnvironmentGhent UniversityGhentBelgium LINCGlobal Department of Biogeography and Global ChangeNational Museum of Natural Science-CSICMadridSpain Faculty of Biology GeobotanyUniversity of FreiburgFreiburg im BreisgauGermany.

Background:In contrast with the negligible contribution of the forest understorey to the total aboveground phytobiomass of a forest,its share in annual litter production and nutrient cycling may be more *** and how this functional role of the understorey differs across forest types and depends upon overstorey characteristics remains to be ***:We sampled 209 plots of the FunDivEUROPE Exploratory Platform,a network of study plots covering local gradients of tree diversity spread over six contrasting forest types in *** estimate the relative contribution of the understorey to carbon and nutrient cycling,we sampled non-lignified aboveground understorey biomass and overstorey leaf litterfall in all *** samples were analysed for C,N and P concentrations,overstorey leaf litterfall for C and N *** additionally quantified a set of overstorey attributes,including species richness,proportion of evergreen species,light availability(representing crown density)and litter quality,and investigated whether they drive the understorey’s contribution to carbon and nutrient *** and conclusions:Overstorey litter production and nutrient stocks in litterfall clearly exceeded the contribution of the understorey for all forest types,and the share of the understorey was higher in forests at the extremes of the climatic *** most of the investigated forest types,it was mainly light availability that determined the contribution of the understorey to yearly carbon and nutrient *** species richness did not affect the contribution of the understorey to carbon and nutrient cycling in any of the investigated forest types.

关键词： FunDivEUROPE Nutrient cycling Litter production Understorey Overstorey Tree species richness Light availability Litter quality Proportion evergreen tree species

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