## 3 Results and Discussion
\begin{table}
\begin{tabular}{l c c c c c c c c c} \hline Natural terrestrial ecosystem & \multicolumn{2}{c}{NTE types} & \multicolumn{2}{c}{Winter} & \multicolumn{2}{c}{Spring} & \multicolumn{2}{c}{Summer} & \multicolumn{2}{c}{Autumnumnumnumn{1}{c}{umnumnumnumn{1}{c}{umnumnumn{1}{c}{umnumn{1}{c}{umnumn{1}{c}{umnumn{1}}{c}}}}} \\ (NTE) types & \(r\) & \(P\) & \(r\) & \(P\) & \(r\) & \(P\) & \(r\) & \(P\) & \(r\) & \(P\) \\ \hline (Sub)nival snow/ice & 0.96 & \(<\)0.001 & -0.44 & \(>\)0.05 & -0.25 & \(>\)0.05 & -0.24 & \(>\)0.05 & 0.74 & 0.05 \\ Alpine barren/sparsely vegetated & 0.85 & \(<\)0.001 & -0.17 & \(>\)0.05 & 0.90 & 0.005 & 0.25 & \(>\)0.05 & 0.95 & 0.001 \\ Boreal barren/sparsely vegetated & 0.72 & \(<\)0.001 & -0.24 & \(>\)0.05 & 0.70 & \(>\)0.05 & 0.20 & \(>\)0.05 & 0.62 & \(>\)0.05 \\ Boreal forest & 0.60 & 0.001 & -0.06 & \(>\)0.05 & -0.02 & \(>\)0.05 & 0.95 & 0.001 & 0.35 & \(>\)0.05 \\ Cool Temperate barren/sparsely vegetated & 0.81 & \(<\)0.001 & -0.37 & \(>\)0.05 & 0.74 & 0.05 & 0.98 & \(<\)0.001 & 0.77 & 0.04 \\ Cool Temperate grassland & 0.58 & 0.001 & -0.69 & \(>\)0.05 & 0.67 & \(>\)0.05 & 0.96 & \(<\)0.001 & 0.52 & \(>\)0.05 \\ Cool Temperate shrubland/woodland & 0.66 & \(<\)0.001 & -0.64 & \(>\)0.05 & 0.20 & \(>\)0.05 & 0.91 & 0.004 & 0.07 & \(>\)0.05 \\ Cool Temperate forest & 0.69 & \(<\)0.001 & -0.39 & \(>\)0.05 & -0.30 & \(>\)0.05 & 0.84 & 0.01 & -0.34 & \(>\)0.05 \\ Warm Temperate barren/sparsely vegetated & 0.93 & \(<\)0.001 & 0.21 & \(>\)0.05 & 0.98 & \(<\)0.001 & 0.98 & \(<\)0.001 & 0.29 & \(>\)0.05 \\ Warm Temperate grassland & 0.91 & \(<\)0.001 & 0.38 & \(>\)0.05 & 0.94 & 0.001 & 0.89 & 0.006 & 0.94 & 0.001 \\ Warm Temperate shrubland/woodland & 0.92 & \(<\)0.001 & 0.51 & \(>\)0.05 & 0.97 & \(<\)0.001 & 0.61 & \(>\)0.05 & 0.93 & 0.002 \\ Warm Temperate forest & 0.87 & \(<\)0.001 & 0.36 & \(>\)0.05 & 0.96 & \(<\)0.001 & 0.69 & \(>\)0.05 & 0.76 & 0.04 \\ Mediterranean barren/sparsely vegetated & 0.92 & \(<\)0.001 & 0.95 & 0.001 & 0.94 & 0.001 & 0.95 & 0.001 & 0.96 & \(<\)0.001 \\ Mediterranean grassland & 0.85 & \(<\)0.001 & 0.97 & \(<\)0.001 & 0.94 & 0.001 & 0.84 & 0.01 & 0.98 & \(<\)0.001 \\ Mediterranean shrubland/woodland & 0.62 & \(<\)0.001 & 0.97 & \(<\)0.001 & 0.99 & \(<\)0.001 & 0.90 & 0.005 & -0.67 & \(>\)0.05 \\ Mediterranean forest & 0.26 & \(>\)0.05 & -0.79 & 0.03 & 0.95 & 0.001 & 0.14 & \(>\)0.05 & 0.86 & 0.01 \\ Mean \(\pm\) SD & & 0.76 \(\pm\) 0.19 & 0.04 \(\pm\) 0.60 & 0.64 \(\pm\) 0.46 & 0.68 \(\pm\) 0.38 & 0.55 \(\pm\) 0.49 \\ \hline \end{tabular}
\end{table} 
Table 3: Correlation of MODIS NDVI and EVI values according to natural land cover types, biogeochemical zones, and seasons in Turkey. season with low amplitudes according to the EVI. However, in cool and warm temperate forests where the high proportion of deciduous vegetation or its pure stands are dominant, the amplitude of the NDVI and EVI increased. Time series decomposition of the VIs revealed that the seven-year trends linearly fitted differed in the direction of change between the VIs for the six NTEs of (sub)nival ice/snow, boreal forest, cool temperate barren/sparsely vegetated land, grassland and shrubland/woodland, and Mediterranean shrubland/woodland (Tables 5 and 6). When the three accuracy measures (MAPE, MAD, and MSD) of the trend equations were compared between the VIs, the trends fitted to the NDVI time series were found to perform better for the three NTEs of (sub)nival snow/ice, and alpine and boreal barren/sparsely vegetated lands than the EVI trends (Tables 5 and 6). The VI trends with the lowest error statistics pointed to the negative NDVI trends for the three highest-altitude NTEs of (sub)nival, alpine and boreal barren/sparsely vegetated lands; the positive EVI trends for the four NTEs of boreal forest, warm temperate and Mediterranean barren/sparsely vegetated lands, and Mediterranean grassland; and the negative EVI trends for the rest of the NTEs (Tables 5 and 6).