## 3 Results and Discussion
The negative VI trends during the seven-year period can indicate increased natural and/or human-induced disturbances of vegetation cover qualitatively and quantitatively such as deforestation, and conversion of land cover from woody to non-woody vegetation [3, 38-43]. \begin{table} \begin{tabular}{l c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{Regression coefficients} & \multicolumn{4}{c}{Regression coefficients} & \multirow{2}{*}{\(r^{2}\)} \\ Natural terrestrial ecosystem types & \multicolumn{2}{c}{Raw NDVI} & & & \multicolumn{2}{c}{Intercept} & \multicolumn{2}{c}{Raw} \\ \cline{2-9}  & Intercept & NDVI & & & & & & \\ \hline (Sub)nival snow/ice & 0.0087 & 0.919 & 93.1 & 2.26 & 0.00911 & 0.904 & 90.9 & 2.00 \\ Alpine barren/sparsely vegetated & 0.0145 & 0.912 & 92.5 & 2.08 & 0.0469 & 0.719 & 73.2 & 2.03 \\ Boreal barren/sparsely vegetated & 0.0130 & 0.910 & 92.3 & 2.17 & 0.0828 & 0.485 & 52.9 & 2.30 \\ Boreal forest & 0.0161 & 0.929 & 94.1 & 3.24 & 0.156 & 0.308 & 32.7 & 2.81 \\ Cool Temperate barren/sparsely vegetated & 0.0424 & 0.818 & 82.7 & 4.97 & 0.0121 & 0.927 & 94.4 & 19.92 \\ Cool Temperate grassland & 0.0603 & 0.789 & 79.8 & 4.58 & 0.0231 & 0.875 & 90.0 & 12.37 \\ Cool Temperate shrubland/woodland & 0.0215 & 0.929 & 94.0 & 9.32 & 0.0439 & 0.784 & 80.7 & 7.60 \\ Cool Temperate forest & 0.0062 & 0.981 & 99.1 & 34.55 & 0.0640 & 0.732 & 75.2 & 6.51 \\ Warm Temperate barren/sparsely vegetated & 0.0575 & 0.780 & 79.1 & 6.00 & 0.0177 & 0.901 & 91.8 & 10.38 \\ Warm Temperate grassland & 0.0667 & 0.824 & 83.7 & 11.31 & 0.0248 & 0.890 & 90.9 & 11.75 \\ Warm Temperate shrubland/woodland & 0.0730 & 0.832 & 84.1 & 13.09 & 0.0153 & 0.940 & 95.9 & 19.92 \\ Warm Temperate forest & 0.0852 & 0.832 & 84.4 & 12.07 & 0.0115 & 0.961 & 98.1 & 41.89 \\ Mediterranean barren/sparsely vegetated & 0.0700 & 0.785 & 79.5 & 6.25 & 0.0583 & 0.717 & 72.7 & 4.32 \\ Mediterranean grassland & 0.0380 & 0.914 & 92.8 & 18.77 & 0.0321 & 0.880 & 89.3 & 10.28 \\ Mediterranean shrubland/woodland & 0.0707 & 0.843 & 86.3 & 8.58 & 0.0540 & 0.804 & 81.6 & 7.18 \\ Mediterranean forest & 0.0361 & 0.933 & 95.5 & 43.66 & 0.0594 & 0.794 & 81.0 & 17.75 \\ \hline \hline \end{tabular}  \ \begin{tabular}{l c c c c c c c} \hline \hline  & \multicolumn{2}{c}{Regression coefficients} & \multirow{2}{*}{\(r^{2}\)} \\ Natural terrestrial ecosystem types & & & & & & & & \\ \cline{2-9}  & Raw NDVI & & & & & & \\ \hline (Sub)nival snow/ice & 0.0087 & 0.919 & 93.1 & 2.26 & 0.00911 & 0.904 & 90.9 & 2.00 \\ Alpine barren/sparsely vegetated & 0.0145 & 0.912 & 92.5 & 2.08 & 0.0469 & 0.719 & 73.2 & 2.03 \\ Boreal barren/sparsely vegetated & 0.0130 & 0.910 & 92.3 & 2.17 & 0.0828 & 0.485 & 52.9 & 2.30 \\ Boreal forest & 0.0161 & 0.929 & 94.1 & 3.24 & 0.156 & 0.308 & 32.7 & 2.81 \\ Cool Temperate barren/sparsely vegetated & 0.0424 & 0.818 & 82.7 & 4.97 & 0.0121 & 0.927 & 94.4 & 19.92 \\ Cool Temperate grassland & 0.0603 & 0.789 & 79.8 & 4.58 & 0.0231 & 0.875 & 90.0 & 12.37 \\ Cool Temperate shrubland/woodland & 0.0215 & 0.929 & 94.0 & 9.32 & 0.0439 & 0.784 & 80.7 & 7.60 \\ Cool Temperate forest & 0.0062 & 0.981 & 99.1 & 34.55 & 0.0640 & 0.732 & 75.2 & 6.51 \\ Warm Temperate barren/sparsely vegetated & 0.0575 & 0.780 & 79.1 & 6.00 & 0.0177 & 0.901 & 91.8 & 10.38 \\ Warm Temperate grassland & 0.0667 & 0.824 & 83.7 & 11.31 & 0.0248 & 0.890 & 90.9 & 11.75 \\ Warm Temperate shrubland/woodland & 0.0730 & 0.832 & 84.1 & 13.09 & 0.0153 & 0.940 & 95.9 & 19.92 \\ Warm Temperate forest & 0.0852 & 0.832 & 84.4 & 12.07 & 0.0115 & 0.961 & 98.1 & 41.89 \\ Mediterranean barren/sparsely vegetated & 0.0700 & 0.785 & 79.5 & 6.25 & 0.0583 & 0.717 & 72.7 & 4.32 \\ Mediterranean grassland & 0.0380 & 0.914 & 92.8 & 18.77 & 0.0321 & 0.880 & 89.3 & 10.28 \\ Mediterranean shrubland/woodland & 0.0707 & 0.843 & 86.3 & 8.58 & 0.0540 & 0.804 & 81.6 & 7.18 \\ Mediterranean forest & 0.0361 & 0.933 & 95.5 & 43.66 & 0.0594 & 0.794 & 81.0 & 17.75 \\ \hline \hline \end{tabular}