Different canopy openings affect underground traits in herbaceous plants of a southern forest in Patagonia  

作　　者：Luciano J.Selzer Carlos A.Busso 

机构地区：[1]CADIC-CONICET,Houssay 200(9410)Ushuaia,Tierra del Fuego,Argentina.Instituto de Ciencias Polares,Ambiente y Recursos Naturales.Universidad Nacional de Tierra del Fuego,Alem 1036(9410)Ushuaia,Tierra del Fuego,Argentina [2]CERZOS-CONICET,San Andrés 800(8000)Bahía Blanca,Buenos Aires,Argentina.Depto.de Agronomía-Universidad Nacional del Sur,San Andrés 800(8000)Bahía Blanca,Buenos Aires,Argentina

出　　处：《Journal of Plant Ecology》2016年第5期542-552,共11页植物生态学报（英文版）

基　　金：Agencia Nacional de Promoción Científica y Tecnológica(PAV2004-22428).L.J.Selzer was recipient of a doctoral scholarship by CONICET.

摘　　要：Aims Forest canopy openings modify the natural environment,producing changes in light quality and intensity,precipitation and temperature.In turn,these changes promote the acclimation of understory species.However,little work has been done on underground responses to those environmental changes.The objective of this work was to determine how Osmorhiza depauperata,Phleum alpinum and Poa pratensis change its root length density and root colonization by mycorrhiza as a function of light availability in a Nothofagus pumilio(i.e.lenga)forest harvested following the variable retention prescription.Methods We selected three microenvironments in an old growth forest harvested by the variable retention prescription:aggregated retention,dispersed retention with influence of aggregated retention and dispersed retention.A non-harvested primary forest(PF),similar to the harvested one,was used as a control.Every 2 months,from October 2008 to April 2009,we took soil cores from randomly selected plants.From these soil cores,root length density and colonization percentage(CP)by arbuscular mycorrhizae were estimated.Important Findings Light availability changed significantly among the microenvironments.In general,root length density was significantly greater in P.pratensis than in P.alpinum and both species greater than in O.depauperata.Light availability increased root length density in all species,although the magnitude of these increases difference among species.Root length density was 187%greater in P.pratensis,101%in P.alpinum and 94%in O.depauperata in the disperse retention system than in the PF.Mycorrhiza CP was higher in O.depauperata than in P.alpinum and P.pratensis.Also,it was lower in the PF than in the harvested microenvironments.CPs were very low.

关 键 词：root length density mycorrhizal colonization light shade UNDERSTORY Tierra del Fuego 

分 类 号：S71[农业科学—林学]