Large-diameter trees, snags, and deadwood in southern Utah, USA
作者机构：Department of Wildland ResourcesS.J.and Jessie E.Quinney College of Natural ResourcesUtah State University5230 Old Main HillLoganUT 84322-5230USA. Department of Renewable ResourcesUniversity of AlbertaEdmontonAlbertaCanada.
出 版 物：《Ecological Processes》 (生态过程（英文）)
年 卷 期：2021年第10卷第1期
页 面：130-141页
核心收录：
学科分类：0710[理学-生物学] 071001[理学-植物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0815[工学-水利工程] 0713[理学-生态学]
基 金：Funding was received from the Utah Agricultural Experiment Station(projects 1153 and 1398 to JAL and 1423 to JAL LLY and DJM)and the Smithsonian Institution ForestGEO.Research was performed under the National Park Service research permits CEBR-2014-SCI-0001 CEBR-2015-SCI0001 CEBR-2016-SCI-0001 CEBR-2017-SCI-0001 CEBR-2018-SCI-0001 and CEBR-2019-SCI-0001 for study CEBR-00016
主 题：Cedar Breaks National Monument Dendroctonus rufipennis Utah Forest Dynamics Plot Vertical fuel structure
摘 要：Background:The epidemic Dendroctonus rufipennis(spruce beetle)outbreak in the subalpine forests of the Colorado Plateau in the 1990s killed most larger Picea engelmannii(Engelmann spruce)*** quarter century later,the larger snags are beginning to fall,transitioning to deadwood(down woody debris)where they may influence fire behavior,regeneration,and habitat ***:We tracked all fallen trees≥1 cm in diameter at breast height(1.37-m high)and mapped all pieces of deadwood≥10-cm diameter and≥1 m in length within 13.64 ha of a high-elevation mixed-species forest in the Picea–Abies zone annually for 5 years from 2015 through *** examined the relative contribution of Picea engelmannii to snag and deadwood pools relative to other species and the relative contributions of large-diameter trees(≥33.2 cm at this subalpine site).We compared spatially explicit mapping of deadwood to traditional measures of surface fuels and introduce a new method for approximating vertical distribution of ***:In this mixed-species forest,there was relatively high density and basal area of live Picea engelmannii 20 years after the beetle outbreak(36 trees ha^(−1) and 1.94 m^(2) ha^(−1)≥10-cm diameter)contrasting with the near total mortality of mature Picea in forests *** from tree boles≥10-cm diameter on the ground had biomass of 42 Mg ha^(−1),7 Mg ha^(−1) of Picea engelmannii,and 35 Mg ha^(−1) of other *** live aboveground biomass was 119 Mg ha^(−1),while snag biomass was 36 Mg ha^(−1).Mean total fuel loading measured with planar transects was 63 Mg ha^(−1) but varied more than three orders of magnitude(0.1 to 257 Mg ha^(−1)).Planar transects recorded 32 Mg ha^(−1) of wood≥7.62-cm diameter compared to the 42 Mg ha^(−1) of wood≥10-cm diameter recorded by explicit *** pieces of deadwood were often stacked,forming a vertical structure likely to contribute to active fire ***:Bark beetle mortality in the 1990s has made
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