红树林根系观察步道

提示词

依据场地与植物参考表现红树林观察步道，保留已记录的根系可见范围和水位，栈道不穿越确认保留植株。

Use site and planting references to show a mangrove observation boardwalk, retaining recorded visible-root extents and water level and keeping the deck clear of confirmed retained plants.