气候变化领域集成服务门户(CCPortal): Monitoring pinyon-juniper cover and aboveground biomass across the Great Basin

CCPortal

DOI	10.1088/1748-9326/ab6785
	Monitoring pinyon-juniper cover and aboveground biomass across the Great Basin
	Filippelli S.K.; Falkowski M.J.; Hudak A.T.; Fekety P.A.; Vogeler J.C.; Khalyani A.H.; Rau B.M.; Strand E.K.
发表日期	2020
ISSN	17489318
卷号	15 期号:2
英文摘要	Since the mid-1800s pinyon-juniper (PJ) woodlands have been encroaching into sagebrush-steppe shrublands and grasslands such that they now comprise 40% of the total forest and woodland area of the Intermountain West of the United States. More recently, PJ ecosystems in select areas have experienced dramatic reductions in area and biomass due to extreme drought, wildfire, and management. Due to the vast area of PJ ecosystems, tracking these changes in woodland tree cover is essential for understanding their consequences for carbon accounting efforts, as well as ecosystem structure and functioning. Here we present a carbon monitoring, reporting, and verification (MRV) system for characterizing total aboveground biomass stocks and flux of PJ ecosystems across the Great Basin. This is achieved through a two-stage remote sensing approach by first using spatial wavelet analysis to rapidly sample tree cover from very high-resolution imagery (1 m), and then training a Random Forest model which maps tree cover across the region from 2000 to 2016 using temporally-segmented Landsat spectral indices obtained from the LandTrendr algorithm in Google Earth Engine. Estimates of cover were validated against field data from the SageSTEP project (R 2 = 0.67, RMSE = 10% cover). Biomass estimated from cover-based allometry was higher than estimates from the Forest Inventory and Analysis Program (FIA) at the plot-level (bias = 5 Mg ha-1 and RMSE = 15.5 Mg ha-1) due in part to differences in tree-level biomass allometrics. County-level aggregation of biomass closely matched estimates from the FIA (R 2 = 0.97) after correcting for bias at the plot level. Even after many previous decades of encroachment, we find forest area (i.e. areas with ≥10% cover) increasing at a steady rate of 0.46% per year, but 80% of the 9.86 Tg increase in biomass is attributable to infilling of existing forest. This suggests that the known consequences of encroachment such as reduced water availability, impacts to biodiversity, and risk of severe wildfire may have been increasing across the region in recent years despite the actions of sagebrush steppe restoration initiatives. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	aboveground biomass; canopy cover; encroachment; Great Basin; monitoring reporting and verification (MRV); pinyon-juniper; woodland
语种	英语
scopus关键词	Biodiversity; Carbon; Decision trees; Ecosystems; Fires; Forestry; Random forests; Remote sensing; Above ground biomass; Canopy cover; encroachment; Great Basin; pinyon-juniper; woodland; Biomass; aboveground biomass; allometry; dicotyledon; ecosystem structure; Landsat; remote sensing; satellite imagery; shrubland; wildfire; woodland; Great Basin; Intermountain West; United States; Artemisia tridentata; Juniperus; Pinus edulis
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/154102
作者单位	Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523-1499, United States; USDA Forest Service, Rocky Mountain Research Station, Forestry Sciences Laboratory, Moscow, ID 83843, United States; Department of Agriculture and Environmental Science, Lincoln University, Jefferson City, MO 65101, United States; USGS New England Water Science Center, Northborough, MA 01532, United States; Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID 83844-1135, United States
推荐引用方式 GB/T 7714	Filippelli S.K.,Falkowski M.J.,Hudak A.T.,et al. Monitoring pinyon-juniper cover and aboveground biomass across the Great Basin[J],2020,15(2).
APA	Filippelli S.K..,Falkowski M.J..,Hudak A.T..,Fekety P.A..,Vogeler J.C..,...&Strand E.K..(2020).Monitoring pinyon-juniper cover and aboveground biomass across the Great Basin.Environmental Research Letters,15(2).
MLA	Filippelli S.K.,et al."Monitoring pinyon-juniper cover and aboveground biomass across the Great Basin".Environmental Research Letters 15.2(2020).