Detecting treeline dynamics in response to climate warming using forest stand maps and Landsat data in a temperate forest

作     者：Maliheh Arekhi Ahmet Yesil Ulas Yunus Ozkan Fusun Balik Sanli 

作者机构：Institutes of Graduate Studies in Science and EnclineeringForest Ena neer haIstanbul University34452 IstanbulTurkey Faculty of ForestryDepartment or Forest ManagementIstanbul University34473 IstanbulTurkey Faculty of Civil EngineeringDepartment of Geomatic EngineeringYlldlz Technical University34220 IstanbulTurkey 

出 版 物：《Forest Ecosystems》 (森林生态系统（英文版）)

年 卷 期：2018年第5卷第3期

页      面：311-324页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0907[农学-林学] 0829[工学-林业工程] 09[农学] 0901[农学-作物学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

主　　题：NDVI Geoshift LST Timberline Mann-Kendall Landsat Climate warming 

摘      要：Background: Treeline dynamics have inevitable impacts on the forest treeline structure and composition. The present research sought to estimate treeline movement and structural shifts in response to recent warming in Cehennemdere, Turkey. After implementing an atmospheric correction, the geo-shifting of images was performed to match images together for a per pixel trend analysis. We developed a new approach based on the NDVI, LST(land surface temperature) data, air temperature data, and forest stand maps for a 43-year period. The forest treeline border was mapped on the forest stand maps for 1970, 1992, 2002, and 2013 to identify shifts in the treeline altitudes, and then profile statistics were calculated for each period. Twenty sample plots(10 × 10 pixels) were selected to estimatethe NDVI and LST shifts across the forest timberline using per-pixel trend analysis and non-parametric Spearman’s correlation analysis. In addition, the spatial and temporal shifts in treeline tree species were computed within the selected plots for four time periods on the forest stand maps to determine the pioneer tree ***: A statistically significant increasing trend in all climate variables was observed, with the highest slopein the monthly average mean July temperature(tau = 0.62, ρ 0.00). The resultant forest stand maps showed a geographical expansion of the treeline in both the highest altitudes(22 m–45 m) and the lowest altitudes(20 m–105 m) from 1970 to 2013. The per pixel trend analysis indicated an increasing trend in the NDVI and LST values within the selected plots. Moreover, increases in the LST were highly correlated with increases in the NDVIbetween 1984 and 2017(r = 0.75, ρ 0.05). Cedrus libani and Juniperus communis app. were two pioneer tree species that expanded and grew consistently on open lands, primarily on rocks and soil-covered areas, from 1970 to ***: The present study il ustrated that forest treeline dynamics and treeline structural