气候变化领域集成服务门户(CCPortal): Monitoring spring phenology in Mediterranean beech populations through in situ observation and Synthetic Aperture Radar methods

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DOI	10.1016/j.rse.2020.111978
	Monitoring spring phenology in Mediterranean beech populations through in situ observation and Synthetic Aperture Radar methods
	Proietti R.; Antonucci S.; Monteverdi M.C.; Garfì V.; Marchetti M.; Plutino M.; Di Carlo M.; Germani A.; Santopuoli G.; Castaldi C.; Chiavetta U.
发表日期	2020
ISSN	00344257
卷号	248
英文摘要	The interest in tree phenology monitoring is increasing because this trait is a robust indicator of the impacts of climate change on natural and managed ecosystems. Different approaches to monitor phenology at different spatial scales, from in situ monitoring to remote sensing, are used to investigate spring and/or autumn phenological changes. In Mediterranean area, most of phenological changes occur during cloudy periods (spring and autumn), leading to a loss of information also for very high temporal resolution satellites. Instead, cloud-uninfluenced sensors, such as radar sensors, can allow to bypass this problem and produce a temporally continuous coverage. In this paper, we analyzed the spring phenology of two European beech (Fagus sylvatica L.) populations, located at different latitudes in Mediterranean area. Weekly in situ monitoring of leaf-out has been correlated with data collected by Synthetic Aperture Radar. Spring phenological phases were monitored in situ following a modified BBCH-code with a 5-scores scale (from 1 - buds closed and covered by scales, to 5 - leaf completely unfolded). The score 3 (young leaves starting to emerge from the bud) was considered the bud break. Different site conditions based on aspect (northern and southern) and altitudinal gradient (high and low altitude) have been considered. The aim was to test and implement a new methodology able to decrease the frequency of the field sampling, using remote data, to extend more detailed information on geographical scale, and to reconstruct past phenology. Results showed a statistically significant different length of the vegetative spring period, spanning from dormant buds, up to leaves completely unfolded, between sites. Through Synthetic Aperture Radar estimation, this study demonstrates that leaf-out can be monitored with an extreme accuracy. The phenophase score 4 and 5 estimation showed the best performance (RMSE < of 4 days), phenophases score 2 and 3 showed promising performances (4 days < RMSE <5 days), while phenophases score 1 seems to be not easily detectable, although it can be extrapolated with an RMSE <6 days. This radar approach fixes the cloud problem typical of multispectral approach and very frequent in phenophase change periods in Mediterranean climate. This study promotes the proposed remote sensing approach as a very useful tool to monitor growing season starting in remote areas, helping to reduce in situ observations and allowing past phenology reconstruction. © 2020 Elsevier Inc.
英文关键词	BBCH; Climate change; Fagus sylvatica; Leaf phenology; SAR; Sentinel-1
语种	英语
scopus关键词	Biology; Forestry; Remote sensing; Synthetic aperture radar; Continuous coverage; European beech (fagus sylvatica l.); High temporal resolution; In-situ observations; Mediterranean areas; Mediterranean climates; Phenological changes; Remote sensing approaches; Climate change; climate change; deciduous tree; growing season; in situ measurement; Mediterranean environment; phenology; remote sensing; satellite sensor; seasonal variation; spring (season); synthetic aperture radar; Mediterranean Region; Fagus; Fagus sylvatica
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/179182
作者单位	CREA, Research Centre for Forestry and Wood, Viale S. Margherita, 80, Arezzo, 52100, Italy; Università degli Studi del Molise, Dipartimento di Agricoltura, Ambiente e Alimenti, Via Francesco de Sanctis, Campobasso, 86100, Italy; Università degli Studi del Molise, Dipartimento di Bioscienze e Territorio, Contrada Fonte Lappone, Pesche, IS 86090, Italy; Università degli Studi del Molise, Centro di Ricerca per le Aree Interne e gli Appennini (ArIA), Via Francesco de Sanctis, Campobasso, 86100, Italy
推荐引用方式 GB/T 7714	Proietti R.,Antonucci S.,Monteverdi M.C.,et al. Monitoring spring phenology in Mediterranean beech populations through in situ observation and Synthetic Aperture Radar methods[J],2020,248.
APA	Proietti R..,Antonucci S..,Monteverdi M.C..,Garfì V..,Marchetti M..,...&Chiavetta U..(2020).Monitoring spring phenology in Mediterranean beech populations through in situ observation and Synthetic Aperture Radar methods.Remote Sensing of Environment,248.
MLA	Proietti R.,et al."Monitoring spring phenology in Mediterranean beech populations through in situ observation and Synthetic Aperture Radar methods".Remote Sensing of Environment 248(2020).