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A combination of climate,tree diversity and local human disturbance determine the stability of dry Afromontane forests

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Forest Ecosystems 2021年第2期8卷 207-222页

作者： Hadgu Hishe Louis Oosterlynck Kidane Giday Wanda De Keersmaecker Ben Somers Bart Muys KU Leuven Department of Earth and Environmental SciencesDivision ForestNature and LandscapeCelestijnenlaan 200EP.O.Box 24113001 LeuvenBelgium Department of Land Resource Management and Environmental Protection Mekelle UniversityCollege of Dryland Agriculture and Natural ResourcesP.O.Box 231MekelleTigrayEthiopia Laboratory of Geo-Information Science and Remote Sensing Wageningen University6708 PB WageningenThe Netherlands

Background:Anthropogenic disturbances are increasingly affecting the vitality of tropical dry *** future condition of this important biome will depend on its capability to resist and recover from these *** far,the temporal stability of dryland forests is rarely studied,even though identifying the important factors associated with the stability of the dryland forests could serve as a basis for forest management and ***:In a degraded dry Afromontane forest in northern Ethiopia,we explored remote sensing derived indicators of forest stability,using MODIS satellite derived NDVI time series from 2001 to *** and resistance were measured using the anomalies(remainders)after time series decomposition into seasonality,trend and remainder *** stability was calculated using the integral of the undecomposed NDVI *** NDVI derived stability indicators were then related to environmental factors of climate,topography,soil,tree species diversity,and local human disturbance,obtained from a systematic grid of field inventory plots,using boosted regression trees in ***:Resilience and resistance were adequately predicted by these factors with an R^(2) of 0.67 and 0.48,respectively,but the model for growth stability was *** of the wettest month,distance from settlements and slope were the most important factors associated with resilience,explaining 51%of the ***,temperature seasonality and humus accumulation were the significant factors associated with the resistance of the forest,explaining 61%of the overall effect.A positive effect of tree diversity on resilience was also important,except that the impact of species evenness declined above a threshold value of 0.70,indicating that perfect evenness reduced the resilience of the *** of the wettest month was the most important factor explaining 43.52%of the growth stability ***:A combination of clima

关键词： Climate Dryland Disturbance Restoration Tigray Growth stability biodiversity function

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