广西不同气候条件马尾松人工林林下木本植物的生活型与叶相差异

为了解不同气候条件下马尾松（Pinus massoniana）人工林林下木本植物群落的结构和发展趋势，以派阳山林场（北热带）、镇龙林场（南亚热带）和华山林场（中亚热带）三地的马尾松人工林幼龄林、中龄林和过熟林为研究对象，分析其林下木本植物生活型与叶相变化规律。研究表明，广西不同气候条件下的马尾松人工林林下木本植物生活型均以中、小高位芽为主，大高位芽、矮高位芽和藤本高位芽占比较低；中型叶、单叶、全缘叶占比较大，叶质以革质、纸质叶为主，渐尖叶为主要叶尖类型。总体来看，植物生活型在不同气候条件之间存在差异，大、中、小高位芽植物占比随年均气温的升高而上升，矮高位芽和藤本高位芽植物占比下降。植物的叶相组成在不同气候条件下存在差异，随着气候条件变化，中型叶和渐尖叶的占比随年均气温的升高而上升，革质叶的占比随之下降。

Differences of Life Forms and Leaf Physiognomy of Understory Woody Plants in Pinus massoniana Plantations Under Different Climate Conditions in Guangxi

In order to understand the structure and development trends of the woody plant communities under the Pinus massoniana plantations in different climate conditions,the young forest,middle-aged forest and overripe forest of P.massoniana plantations in Paiyangshan Forest Farm (north tropics),Zhenlong Forest Farm (south subtropics) and Huashan Forest Farm (middle subtropics) were the research objects,and the life forms and leaf physiognomy change of understory woody plants were analyzed. The results showed that the life forms of understory woody plants in P.massoniana plantations under different climatic conditions in Guangxi was mainly mesophanerophytes and microphanerophytes,macrophanerophytes,nanophanerophytes and chamaephanerophytes accounted for a relatively low proportion. The mesophyll leaves,the single leaves and entire margined leaves accounted for a large proportion. The leaf quality is mainly leathery and papery,and the acuminate leaf was the main leaf tip type. In general,there were differences in the plant life forms between different climatic conditions,the proportion of macrophanerophytes,mesophanerophytes and microphanerophytes showed an upward trend with the increase of mean annual temperature,the proportion of nanophanerophyte and chamaephanerophytes showed a downward trend. With the change of climatic conditions,the proportion of mesophyll and acuminate showed an upward trend with the increase of mean annual temperature,the proportion of leathery showed a downward trend,there were geographical differences in the composition of the leaf physiognomy.