Assessment of forest dieback on the Moroccan Central Plateau using spectral vegetation indices  

作　　者：Youssef Dallahi Amal Boujraf Modeste Meliho Collins Ashianga Orlando 

机构地区：[1]Laboratory of Microbial Biotechnologies,Agrosciences and Environment(BioMAgE),Faculty of Sciences Semlalia,Cadi Ayyad University,Marrakech,Morocco [2]Laboratoire des Productions Végétale,Animales et Agro-industrie,Equipe de Botanique,Biotechnologie et Protection des Plantes,Facultédes Sciences,UniversitéIbn Tofail,Kenitra,Morocco [3]Sociétés,Territoires,Histoires et Patrimoines,Facultédes Lettres et des Sciences Humaines,UniversitéMohammed V,Rabat,Morocco [4]Rabat,Morocco

出　　处：《Journal of Forestry Research》2023年第3期793-808,共16页林业研究（英文版）

摘　　要：Cork oak forests in Morocco are rich in resources and services thanks to their great biological diversity,playing an important ecological and socioeconomic role.Considerable degradation of the forests has been accentuated in recent years by signifi cant human pressure and eff ects of climate change;hence,the health of the stands needs to be monitored.In this study,the Google Engine Earth platform was leveraged to extract the normalized diff erence vegetation index(NDVI)and soil-adjusted vegetation index,from Landsat 8 OLI/TIRS satellite images between 2015 and 2017 to assess the health of the Sibara Forest in Morocco.Our results highlight the importance of interannual variations in NDVI in forest monitoring;the variations had a signifi cantly high relationship(p<0.001)with dieback severity.NDVI was positively and negatively correlated with mean annual precipitation and mean annual temperature with respective coeffi cients of 0.49 and−0.67,highlighting its ability to predict phenotypic changes in forest species.Monthly interannual variation in NDVI between 2016 and 2017 seemed to confi rm fi eld observations of cork oak dieback in 2018,with the largest decreases in NDVI(up to−38%)in December in the most-aff ected plots.Analysis of the infl uence of ecological factors on dieback highlighted the role of substrate as a driver of dieback,with the most severely aff ected plots characterized by granite-granodiorite substrates.

关 键 词：Forest health monitoring Remote sensing DIEBACK Vegetation indices Sibara forest 

分 类 号：S758.5[农业科学—森林经理学]