Large-diameter trees dominate snag and surface biomass following reintroduced fire

查看全文 作　　者：James [1]A.Lutz;Soren [1]Struckman;Tucker [1]J.Furniss;C.Alina [2]Cansler;Sara [1]J.Germain;Larissa [1]L.Yocom;Darren [1]J.McAvoy;Crystal [3]A.Kolden;Alistair [4]M.S.Smith;Mark [5]E.Swanson;Andrew [6]J.Larson

机构地区：[1]Department of Wildland Resources,S.J.and Jessie E.Quinney College of Natural Resources,Utah State University,5230 Old Main Hill,Logan,Utah 84322-5230,USA;[2]School of Environmental and Forest Sciences,University of Washington,Box 352100,Seattle,Washington 98195,USA;[3]Management of Complex Systems,University of California,Merced,5200 North Lake Road,Merced,California 95343,USA;[4]Department of Forest,Rangeland,and Fire Sciences,College of Natural Resources,University of Idaho,875 Perimeter Drive,Moscow,Idaho 83844-1133,USA;[5]School of the Environment,Washington State University,Box 646410,Pullman,Washington 99164-6420,USA;[6]Wilderness Institute,W.A.Franke College of Forestry and Conservation,University of Montana,32 Campus Drive,Missoula,Montana 59812,USA

出　　处：《Ecological Processes》索引2020年第9卷第1期,共13页

基　　金：Funding was received from the Utah Agricultural Experiment Station(projects 1153,1398,and 1423 to JAL);the Joint Fire Science Program(award 16-1-04-02 to JAL and AJL);the National Park Service(Awards P14AC00122 and P14AC00197 to JAL);the Smithsonian Institution ForestGEO.Re-search was performed under National Park Service research permits YOSE-2013-SCI-0012,YOSE-2014-SCI-0005,YOSE-2015-SCI-0014,YOSE-2016-SCI-0006,YOSE-2017-SCI-0008,YOSE-2018-SCI-0006,and YOSE-2019-SCI-0009 for study YOSE-0051. 摘　　要：The reintroduction of fire to landscapes where it was once common is considered a priority to restore historical forest dynamics,including reducing tree density and decreasing levels of woody biomass on the forest floor.However,reintroducing fire causes tree mortality that can have unintended ecological outcomes related to woody biomass,with potential impacts to fuel accumulation,carbon sequestration,subsequent fire severity,and forest management.In this study,we examine the interplay between fire and carbon dynamics by asking how reintroduced fire impacts fuel accumulation,carbon sequestration,and subsequent fire severity potential.Beginning pre-fire,and continuing 6 years post-fire,we tracked all live,dead,and fallen trees≥1 cm in diameter and mapped all pieces of deadwood(downed woody debris)originating from tree boles≥10 cm diameter and≥1 m in length in 25.6 ha of an Abies concolor/Pinus lambertiana forest in the central Sierra Nevada,California,USA.We also tracked surface fuels along 2240 m of planar transects pre-fire,immediately post-fire,and 6 years post-fire.Six years after moderate-severity fire,deadwood≥10 cm diameter was 73 Mg ha^(−1),comprised of 32 Mg ha^(−1) that persisted through fire and 41 Mg ha^(−1) of newly fallen wood(compared to 72 Mg ha^(−1) pre-fire).Woody surface fuel loading was spatially heterogeneous,with mass varying almost four orders of magnitude at the scale of 20 m×20 m quadrats(minimum,0.1 Mg ha^(−1);mean,73 Mg ha^(−1);maximum,497 Mg ha^(−1)).Wood from large-diameter trees(≥60 cm diameter)comprised 57%of surface fuel in 2019,but was 75%of snag biomass,indicating high contributions to current and future fuel loading.Reintroduction of fire does not consume all large-diameter fuel and generates high levels of surface fuels≥10 cm diameter within 6 years.Repeated fires are needed to reduce surface fuel loading. 关键词：California Rim Fire Fuel reduction Sierra Nevada mixed-conifer Smithsonian ForestGEO Yosemite Forest Dynamics Plot Yosemite National Park

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Large-diameter trees dominate snag and surface biomass following reintroduced fire

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