气候变化领域集成服务门户(CCPortal): Persistent changes in the horizontal and vertical canopy structure of fire-tolerant forests after severe fire as quantified using multi-temporal airborne lidar data

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DOI	10.1016/j.foreco.2020.118255
	Persistent changes in the horizontal and vertical canopy structure of fire-tolerant forests after severe fire as quantified using multi-temporal airborne lidar data
	Karna Y.K.; Penman T.D.; Aponte C.; Hinko-Najera N.; Bennett L.T.
发表日期	2020
ISSN	0378-1127
卷号	472
英文摘要	Wildfires can influence the canopy structure of resprouter forests in multiple ways including crown scorching and consumption, tree damage and mortality, and changes in resources available for recovery. Few studies have quantified post-fire changes in the canopy structure of fire-tolerant eucalypt forests, which limits understanding of the extent and persistence of fire effects on ecosystem processes including interactions with environment. In this study, we assess the impacts of a landscape-scale wildfire on the canopy structure of fire-tolerant eucalypt forests in temperate Australia using metrics derived from airborne lidar data. Our assessment, made seven years after the wildfire, encompassed four fire severities (unburnt, low, moderate, high) and involved 1084 lidar plots (0.06 ha, including validation using 51 field plots) across an area of ~30,000 ha in a single forest type. We used Random Forest models to examine the relative importance of fire severity, pre-fire canopy metrics, climate and topography to the prediction of seven post-fire metrics representing the horizontal and vertical structure of the full canopy, the dominant and sub-dominant strata. Canopy cover at seven years post-fire was significantly reduced in moderate- and particularly high-severity plots (mean decrease of 30%). High-severity fire also decreased mean canopy height and led to changes in the canopy relief ratio and rumple index consistent with a dominant stratum that was more heterogeneous and fragmented. In addition to fire severity, the pre-fire values of each metric were important to their post-fire prediction, suggesting that canopy structural recovery after this fire could have been influenced by any lingering effects of previous fires. Topographic and climatic variables were of comparatively minor importance to the prediction of post-fire canopy metrics, although relationships with the forest drought stress index indicated that canopy recovery was slowest at the driest sites. Our study provides quantitative evidence of significant changes in the canopy structure of fire-tolerant eucalypt forests that persisted for at least seven years after high-severity wildfire. Recent trends in southern Australia of shortened wildfire intervals and a drier climate will likely narrow the windows for canopy recovery of fire-tolerant forests, realizing predictions of a gradual opening and fragmentation of forest canopies in temperate Australia and associated changes in multiple ecosystem processes. © 2020 Elsevier B.V.
英文关键词	Airborne lidar data; Canopy cover; Canopy metrics; Eucalypt forest; Fire severity; Random forests; South-eastern Australia
语种	英语
scopus关键词	Climate models; Decision trees; Ecosystems; Forecasting; Forestry; Optical radar; Recovery; Shape optimization; Topography; Airborne lidar data; Canopy structure; Climatic variables; Ecosystem process; Eucalypt forest; High severity fires; Landscape scale; Vertical structures; Fires; airborne sensing; canopy architecture; drought stress; evergreen forest; fire behavior; forest fire; lidar; model validation; satellite data; temperate forest; wildfire; Ecosystems; Fires; Forecasts; Forestry; Recovery; Topography; Australia
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155192
作者单位	School of Ecosystem and Forest Sciences, The University of Melbourne, 4 Water Street, Creswick, VIC 3363, Australia; School of Ecosystem and Forest Sciences, The University of Melbourne, 500 Yarra Boulevard, Richmond, VIC 3121, Australia
推荐引用方式 GB/T 7714	Karna Y.K.,Penman T.D.,Aponte C.,et al. Persistent changes in the horizontal and vertical canopy structure of fire-tolerant forests after severe fire as quantified using multi-temporal airborne lidar data[J],2020,472.
APA	Karna Y.K.,Penman T.D.,Aponte C.,Hinko-Najera N.,&Bennett L.T..(2020).Persistent changes in the horizontal and vertical canopy structure of fire-tolerant forests after severe fire as quantified using multi-temporal airborne lidar data.Forest Ecology and Management,472.
MLA	Karna Y.K.,et al."Persistent changes in the horizontal and vertical canopy structure of fire-tolerant forests after severe fire as quantified using multi-temporal airborne lidar data".Forest Ecology and Management 472(2020).