热带地区的树木,不像温带地区的那样每年随季节变化而周期性地落叶和抽叶。然而巴西橡胶树是个例外,虽然橡胶幼树的叶片可保留较长时期,而成龄胶树在每年年初(在马来半岛约在2、3月)则有落光叶子的现象。这种通常称为越冬期的无叶期,往往持续几周才重新抽叶。某些产胶地区在越冬期常常因减产而停割。这种情况突出了控制胶叶衰老因素研究的重要性。 Trees in the tropics, unlike the temperate regions, decay and seasonally leaf decay and leaves periodically. However, the Brazilian rubber tree is an exception, although rubbery sapling leaves can be retained for a longer period of time, while the aging gum tree leaves shimmering leaves at the beginning of each year (around February and March in the Malay Peninsula). This leafless stage, often referred to as wintering, often re-leaves for several weeks. Some rubber-producing areas in the winter win-cut often cut. This situation highlights the importance of controlling the factor of leaf senescence.