# Impacts of Drought and Heatwave on the Vegetation and Ecosystem in the Yangtze River Basin in 2022
## 2 Materials and Methods
### Methods
#### 2.6.1 Spatiotemporal Evolution Analysis
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Code** & **Type** & **Details** \\ \hline \multirow{2}{*}{1} & Evergreen Needleleaf & Lands dominated by woody vegetation with a percent cover \textgreater{}60\% and height exceeding 2 m. Almost all trees remain green all year. Canopy is never without green foliage. \\ \hline \multirow{2}{*}{2} & Evergreen Broadleaf & Lands dominated by woody vegetation with a percent cover \textgreater{}60\% and height exceeding 2 m. Almost all trees and shrubs remain green year-round. Canopy is never without green foliage. \\ \hline \multirow{2}{*}{3} & Deciduous Needleleaf & Lands dominated by woody vegetation with a percent cover \textgreater{}60\% and height exceeding 2 m. Consists of seasonal needleleaf tree communities with an annual cycle of leaf-on and leaf-off periods. \\ \hline \multirow{2}{*}{4} & Deciduous Broadleaf & Lands dominated by woody vegetation with a percent cover \textgreater{}60\% and height exceeding 2 m. Consists of broadleaf tree communities with an annual cycle of leaf-on and leaf-off periods. \\ \cline{2-3}  & Forests & Lands dominated by trees with a percent cover \textgreater{}60\% and height exceeding 2 m. \\ \hline \multirow{2}{*}{5} & Mixed Forests & Consists of tree communities with interspersed mixtures or mosaics of the other four forest types. None of the forest types exceeds 60\% of the landscape. \\ \hline \multirow{2}{*}{6} & Closed Shrublands & Lands with woody vegetation less than 2 m tall and with shrub canopy cover \textgreater{}60\%. The shrub foliage can be either evergreen or deciduous. \\ \hline \multirow{2}{*}{7} & Open Shrublands & Lands with woody vegetation less than 2 m tall and with shrub canopy cover between 10 and 60\%. The shrub foliage can be either evergreen or deciduous. \\ \hline \multirow{2}{*}{8} & Woody Savannas & Lands with herbaceous and other understory systems and forest canopy cover between 30 and 60\%. The forest cover height exceeds 2 m. \\ \hline \multirow{2}{*}{9} & Savannas & Lands with herbaceous and other understory systems and forest canopy cover between 10 and 30\%. The forest cover height exceeds 2 m. \\ \hline \multirow{2}{*}{10} & Grasslands & Lands with herbaceous types of cover. Tree and shrub cover is less than 10\%. Permanent wetlands lands with a permanent mixture of water and herbaceous or woody vegetation. The vegetation can be present in either salt, brackish, or fresh water. \\ \hline \multirow{2}{*}{11} & Permanent Wetlands & Lands with a permanent mixture of water and herbaceous or woody vegetation that cover extensive areas. The vegetation can be present in salt, brackish, or fresh water. \\ \hline \multirow{2}{*}{12} & \multirow{2}{*}{Croplands} & Lands covered with temporary crops followed by harvest and a bare soil period (e.g., single and multiple cropping systems). Note that perennial woody crops will be classified as the appropriate forest or shrub land cover type. \\ \hline \multirow{2}{*}{13} & Urban and Built-up Lands & Land covered by buildings and other man-made structures. \\ \hline \multirow{2}{*}{14} & Cropland/Natural & Lands with a mosaic of croplands, forests, shrublands, and grasslands in which no one component comprises more than 60\% of the landscape. \\ \hline \multirow{2}{*}{15} & Snow and Ice & Lands under snow/ice cover most of the year. \\ \hline \multirow{2}{*}{16} & \multirow{2}{*}{Barren Sparse Vegetation} & Lands with exposed soil, sand, or rocks and less than 10\% vegetative cover during any time of the year. \\ \hline \multirow{2}{*}{17} & Water Bodies & Oceans, lakes, reservoirs, and rivers, which can be freshwater or saline. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: IGBP global land cover classification system.