## 3 Results
### Sensitivity Analysis
#### 3.2.1 Global Sensitivity Analysis of the FPAR
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**General Dataset 1**} & \multicolumn{4}{c}{**Specific Dataset 2**} & \multirow{2}{*}{**Total Rank**} \\ \cline{2-2} \cline{4-9}
**VI** & \multicolumn{1}{c}{**Regression**} & & & & & & & \\  & \multicolumn{1}{c}{**Equation**} & & & & & & & \\  & \multicolumn{1}{c}{} & & & & & & & \\  & \multicolumn{1}{c}{} & & & & & & & \\ \hline OSAVI & \(y=1.1273\),8807 & 0.817 & 0.054 & 1 & \(y=1.1643\),054 & 0.771 & 0.100 & 5 & 6 \\ WDRVI & \(y=0.4055\) + 0.650 & 0.766 & 0.061 & 4 & \(y=0.6632\) + 0.648 & 0.823 & 0.088 & 2 & 6 \\ mSR & \(y=0.5569\),035 & 0.766 & 0.061 & 6 & \(y=0.5599\),034 & 0.818 & 0.089 & 4 & 10 \\ MTVI2 & \(y=0.9839\),032 & 0.776 & 0.060 & 2 & \(y=0.9773\),035 & 0.712 & 0.112 & 9 & 11 \\ RVI & \(y=0.4548\) + 0.2277 & 0.753 & 0.063 & 10 & \(y=0.2533\) + 0.821 & 0.082 & 0.089 & 3 & 13 \\ NDVI & \(y=0.9103\) + 0.055 & 0.744 & 0.064 & 12 & \(y=0.8937\) + 0.108 & 0.840 & 0.084 & 1 & 13 \\ OSVI\({}_{\text{red-edge}}\) & \(y=1.4242\),034 & 0.764 & 0.057 & 8 & \(y=1.3153\),054 & 0.726 & 0.109 & 8 & 16 \\ MCARVI & \(y=0.8833\),0327 & 0.769 & 0.061 & 3 & \(y=0.8959\),035 & 0.689 & 0.117 & 13 & 16 \\ SR & \(y=0.4559\),027 & 0.753 & 0.063 & 11 & \(y=0.4310\),027 & 0.756 & 0.103 & 6 & 17 \\ RDVI\({}_{\text{red-edge}}\) & \(y=1.3322\),068 & 0.766 & 0.061 & 5 & \(y=1.2959\),034 & 0.696 & 0.115 & 12 & 17 \\ RDVI & \(y=1.1784\),046 & 0.754 & 0.063 & 9 & \(y=1.1333\),051 & 0.707 & 0.113 & 10 & 19 \\ MSAVI & \(y=1.2093\),048 & 0.755 & 0.063 & 7 & \(y=1.0214\),048 & 0.665 & 0.121 & 15 & 22 \\ mNDVI & \(y=0.9083\),040 & 0.683 & 0.071 & 17 & \(y=0.9344\),028 & 0.747 & 0.105 & 7 & 24 \\ NDVD\({}_{\text{red-edge}}\) & \(y=1.1891\),0427 & 0.691 & 0.070 & 16 & \(y=1.1533\),035 & 0.703 & 0.114 & 11 & 27 \\ SAVI & \(y=1.1599\),028 & 0.729 & 0.066 & 13 & \(y=1.0972\),049 & 0.656 & 0.123 & 19 & 32 \\ EVE & \(y=1.1038\),0411 & 0.728 & 0.066 & 14 & \(y=1.0183\),042 & 0.659 & 0.122 & 18 & 32 \\ CMDVI & \(y=1.1755\) + 0.3073 & 0.671 & 0.073 & 18 & \(y=2.2892\) + 0.898 & 0.673 & 0.120 & 14 & 32 \\ EVI & \(y=1.0144\),087 & 0.710 & 0.068 & 15 & \(y=0.9974\),024 & 0.630 & 0.127 & 20 & 35 \\ mNDVI & \(y=-1.1755\) + 0.0377 & 0.671 & 0.073 & 19 & \(y=1.0775\) + 0.067 & 0.660 & 0.122 & 17 & 36 \\ mSR\({}_{\text{red-edge}}\) & \(y=0.7588\),030 & 0.665 & 0.073 & 20 & \(y=0.7933\),030 & 0.664 & 0.121 & 16 & 36 \\ Cl\({}_{\text{red-edge}}\) + 0.75 & \(y=0.5964\),035 & 0.633 & 0.077 & 21 & \(y=0.6333\),032 & 0.594 & 0.133 & 22 & 43 \\ Cl\({}_{\text{perm}}\) & \(y=0.4964\),0207 & 0.604 & 0.080 & 23 & \(y=0.8929\),026 & 0.563 & 0.138 & 23 & 46 \\ SR\({}_{\text{red-edge}}\) & \(y=0.4764\),0415 & 0.610 & 0.079 & 22 & \(y=0.5064\),037 & 0.548 & 0.140 & 25 & 47 \\ DVI & \(y=1.1873\),034 & 0.599 & 0.080 & 24 & \(y=1.1333\),037 & 0.549 & 0.140 & 24 & 48 \\ GVI & \(y=0.5227\) + 0.635 & 0.517 & 0.088 & 28 & \(y=0.664\),07 + 0.595 & 0.600 & 0.132 & 21 & 49 \\ mNDVI\({}_{\text{red-edge}}\) & \(y=1.1475\),0271 & 0.538 & 0.086 & 26 & \(y=1.1055\),034 & 0.543 & 0.141 & 26 & 52 \\ GRVI & \(y=0.4273\),040 & 0.581 & 0.082 & 25 & \(y=0.4573\),034 & 0.520 & 0.145 & 28 & 53 \\ ARVI & \(y=0.8247\) + 0.597 & 0.518 & 0.088 & 27 & \(y=0.7087\) + 0.635 & 0.415 & 0.160 & 29 & 56 \\ VDVI & \(y=0.5813\) + 0.577 & 0.472 & 0.092 & 29 & \(y=0.7177\),052 & 0.543 & 0.141 & 27 & 56 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Regression equation derived tivity index of the LAI decreased from 0.79 to 0.67, and the sensitivity of ALA increased from 0.08 to 0.17. Although the influences of C\({}_{\text{ab}}\) and posil on the FPAR variation were relatively weak, they were still much higher than those of the other four parameters (i.e., N, C\({}_{\text{m}}\), hspot and C\({}_{\text{w}}\)), of which the influences on the FPAR changes were less than one thousandth and could be considered negligible.