## 3 Results  
### Ecological Function Monitoring Zoning of the GGP  
The ecological function monitoring zoning of the GGP is shown in Figure 3 (See Table 3 for the meaning of codes in legend names), which includes 77 ecological function monitoring unit areas of the GGP. The naming method is the first-level area of forest zoning + climate area + typical ecological zones in China. Among them, there are 8 in Northeast China, 10 in North China, 16 in East central and south China, 2 in Yunnan-Guizhou Plateau, 3 in South China, 6 in the southwest alpine canyon area, 4 in forest-steppe and grassland \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Provincial Area**} & \multirow{2}{*}{**Low-Intensity Area**} & \multicolumn{2}{c}{**Medium-Intensity Area**} & \multirow{2}{*}{**High-Intensity Area**} \\  & & & **Area** & \\ \hline Beijing & 0.00–0.91 & 0.91–1.52 & - \\ Tianjin & 0.00–0.93 & - & - \\ Hebei & 0.00–1.17 & 1.17–3.72 & 3.72–7.52 \\ Shanxi & 0.00–0.91 & 0.91–2.06 & 2.06–4.58 \\ Neimenggu & 0.00–1.92 & 1.92–4.51 & 4.51–8.41 \\ Liaoning & 0.00–1.00 & 1.00–3.57 & 3.57–8.79 \\ Jilin & 0.00–1.41 & 1.41–4.70 & 4.70–11.39 \\ Heilongjiang & 0.00–0.57 & 0.57–2.00 & 2.00–5.39 \\ Anhui & 0.00–0.36 & 0.36–0.98 & 0.98–1.68 \\ Jiangxi & 0.00–0.42 & 0.42–1.04 & 1.04–2.17 \\ Henan & 0.00–0.39 & 0.39–1.45 & 1.45–4.00 \\ Hubei & 0.00–0.74 & 0.74–1.84 & 1.84–3.16 \\ Hunan & 0.00–0.82 & 0.82–2.31 & 2.31–7.16 \\ Guangxi & 0.00–0.65 & 0.65–1.67 & 1.67–3.08 \\ Hainan & 0.00–0.37 & 0.37–1.10 & 1.10–2.31 \\ Chongqing & 0.00–1.37 & 1.37–5.73 & 5.73–10.72 \\ Sichuan & 0.00–1.02 & 1.02–2.03 & 2.03–3.44 \\ Guizhou & 0.00–1.42 & 1.42–3.21 & 3.21–6.67 \\ Yunnan & 0.00–0.82 & 0.82–1.78 & 1.78–3.57 \\ Xizang & 0.00–0.12 & 0.12–0.29 & 0.29–0.49 \\ Shanxi & 0.00–1.43 & 1.43–4.76 & 4.76–12.72 \\ Gansu & 0.00–1.79 & 1.79–4.00 & 4.00–7.65 \\ Qinghai & 0.00–0.79 & 0.79–2.37 & 2.37–6.42 \\ Ningxia & 0.00–0.40 & 0.40–6.69 & 6.69–11.73 \\ Xinjiang Production & & & \\ and Construction & 0.00–0.90 & 0.90–2.18 & 2.18–4.73 \\ Corps & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Area intensity classification of the Grain for Green Project at the provincial level (unit: 10\({}^{4}\) ha). area in eastern Inner Mongolia, 13 in Meng-Xin desert semi-desert area, and 15 in grassland meadow and the cold desert area of Qinghai-Tibet Plateau. In addition, among the ecological function monitoring units of the project, 88.31%, 70.13%, 69.53%, and 89.61% are in NMEPREA, NEFA, NEBA, and NKEFA, respectively (refers to all or part of the monitoring area of the ecological function of the GGP). Different ecological function monitoring unit areas of the GGP have different climates, topography, and soil conditions, and the ecological functions of forest ecosystems are significantly different. In addition, different typical ecological zones have different ecological needs for regional development. Therefore, the layout of the monitoring station based on this zoning can not only comprehensively monitor the GGP areas with different ecological functions but can also meet the monitoring needs of different typical ecological zones. Figure 3: Ecological function monitoring zone and monitoring station layout of the Grain for Green Project (See Table 3 for the meaning of codes in legend names).