气候变化领域集成服务门户(CCPortal): Source or Sink? A comparison of Landfire- and FIA-based estimates of change in aboveground live tree carbon in California's forests

CCPortal

DOI	10.1088/1748-9326/ab1aca
	Source or Sink? A comparison of Landfire- and FIA-based estimates of change in aboveground live tree carbon in California's forests
	Holland T.G.; Stewart W.; Potts M.D.
发表日期	2019
ISSN	17489318
卷号	14 期号:7
英文摘要	Forests play a central role in addressing climate change, and accurate estimates of forest carbon are critical for the development of actions that reduce emissions from forests and that maximize sequestration by forests. Methodological challenges persist regarding how best to estimate forest carbon stocks and flux at regulatory-relevant scales. Using California, USA as a case study, we compare two approaches to stock-difference forest carbon estimation for aboveground live trees: one based on ground inventories and one on land cover classification of remotely-sensed data. Previous work using ground inventory data from the Forest Inventory and Analysis Program (FIA) showed net aboveground carbon (AGC) sequestration by live trees in California forests, while estimates using land cover classification from the Landscape Fire and Resource Management Planning Tools (Landfire) showed net reductions in live tree AGC over a similar time period. We examined the discrepancy by re-analyzing the FIA inventory data through the lens of a category-change analysis based on Landfire. This analysis showed more than 50% of the live tree AGC in fewer than 4% of Landfire-equivalent categories and that the overwhelming majority (>80%) of forest area did not change height category between measurement periods. Despite the lack of categorical change, the majority of FIA plots increased in both 95th percentile tree height and in live tree AGC. These findings suggest that an approach based on observing categorical changes risks undercounting AGC sequestration resulting from growth and thus overstating the relative importance of AGC reductions that result from disturbances. This would bias AGC flux estimates downward, leading us to validate the conclusion that live trees in California were a net sink of aboveground carbon in the decade ending in 2016. Our findings suggest an inventory-based or hybrid approach is preferable to methods that depend on categorical bins for estimating AGC in disturbance-prone forest ecosystems. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	California; carbon accounting; Climate change; FIA; forest carbon; landfire
语种	英语
scopus关键词	Carbon; Climate change; Ecosystems; Emission control; Information management; Above-ground carbons; California; Carbon accounting; Forest carbons; Forest inventory and analysis; Land cover classification; landfire; Remotely sensed data; Forestry
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154521
作者单位	Department of Environmental Science Policy and Management, University of California, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Holland T.G.,Stewart W.,Potts M.D.. Source or Sink? A comparison of Landfire- and FIA-based estimates of change in aboveground live tree carbon in California's forests[J],2019,14(7).
APA	Holland T.G.,Stewart W.,&Potts M.D..(2019).Source or Sink? A comparison of Landfire- and FIA-based estimates of change in aboveground live tree carbon in California's forests.Environmental Research Letters,14(7).
MLA	Holland T.G.,et al."Source or Sink? A comparison of Landfire- and FIA-based estimates of change in aboveground live tree carbon in California's forests".Environmental Research Letters 14.7(2019).