气候变化领域集成服务门户(CCPortal): Drought response of urban trees and turfgrass using airborne imaging spectroscopy

CCPortal

DOI	10.1016/j.rse.2020.111646
	Drought response of urban trees and turfgrass using airborne imaging spectroscopy
	Miller D.L.; Alonzo M.; Roberts D.A.; Tague C.L.; McFadden J.P.
发表日期	2020
ISSN	00344257
卷号	240
英文摘要	Vegetation growth and physiological functioning, including carbon uptake and transpiration, can be strongly affected by drought. During water-limited conditions, urban vegetation may be limited in its ability to provide ecosystem services, such as shading and evaporative cooling. While there has been extensive research on drought response in natural vegetation and agricultural systems using remote sensing, drought impacts on urban vegetation have remained understudied. With >50% of people worldwide living in cities and the increased potential for future droughts, it is important to understand how urban vegetation will respond and to evaluate potential impacts. Here, we used repeat flights of NASA airborne imaging spectroscopy (AVIRIS and AVIRIS-NG) to quantify the responses of common urban tree species and turfgrass in downtown Santa Barbara, California, USA to the 2012–2016 California drought. The effects of the drought on vegetation were quantified using several spectral indicators: fractional cover from multiple endmember spectral mixture analysis (MESMA), vegetation indices, and continuum removed absorption features. We used existing tree crown object polygons that were classified to species and had associated estimates of pre-drought leaf area index and biomass. We also included polygons of turfgrass parks and recreational fields. All tree species and turfgrass had four or more spectral indicators with significantly lower mean values (p < 0.05) during the drought in 2014, and evidence of recovery was observed for some species in 2017, which was after the drought had ended. In general, needleleaf and native trees were more affected than broadleaf and non-native trees, respectively, but with considerable interspecific variability. Based on the spectral indicators, turfgrass cover senesced in the middle of the drought but recovered soon after the drought ended, whereas the majority of tree species had not fully recovered. Mean green vegetation cover declined in most tree canopies during the drought, primarily exposing paved surfaces and/or non-photosynthetic vegetation, depending on the site type and tree patch size. Drought impacts as expressed in spectral indicators were generally more severe in tree patches with high pre-drought leaf area index, suggesting that denser, leafier canopies were more difficult for trees to maintain during the drought. Most spectral indicators were correlated with one another (R > 0.4), suggesting co-occuring adjustments of greenness, water content, and plant pigments. © 2020 Elsevier Inc.
英文关键词	AVIRIS; California; Continuum removal; Drought; Hyperspectral; Imaging spectrometer; Leaf area index; Spectral mixture analysis; Tree species; Turfgrass; Urban; Vegetation index
语种	英语
scopus关键词	Ecosystems; Evaporative cooling systems; Forestry; Hyperspectral imaging; Infrared spectrometers; Mixtures; NASA; Recovery; Remote sensing; Vegetation; AVIRIS; California; Continuum removal; HyperSpectral; Imaging spectrometers; Leaf Area Index; Spectral mixture analysis; Tree species; Turfgrass; Urban; Vegetation index; Drought; absorption; AVIRIS; drought; grass; leaf area index; shading; vegetation cover; vegetation index; water content; California; Santa Barbara [California]; United States; Poaceae
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179412
作者单位	Department of Geography, University of California, Santa Barbara, CA 93106, United States; Department of Environmental Science, American University, Washington, DC 20016, United States; Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States
推荐引用方式 GB/T 7714	Miller D.L.,Alonzo M.,Roberts D.A.,et al. Drought response of urban trees and turfgrass using airborne imaging spectroscopy[J],2020,240.
APA	Miller D.L.,Alonzo M.,Roberts D.A.,Tague C.L.,&McFadden J.P..(2020).Drought response of urban trees and turfgrass using airborne imaging spectroscopy.Remote Sensing of Environment,240.
MLA	Miller D.L.,et al."Drought response of urban trees and turfgrass using airborne imaging spectroscopy".Remote Sensing of Environment 240(2020).