【目的】探索毛竹林扩展过程中叶片的适应特性和生存对策,为合理调控毛竹林的扩展提供依据。【方法】以毛竹-撂荒地扩展界面为对象,比较了不同扩展阶段毛竹比叶面积(SLA)、叶干物质含量(LDMC)及叶片主要养分元素及计量比等叶功能性状。【结果】(1)随着毛竹的扩展,SLA呈先上升后降低的趋势,扩展前期、中期和后期的SLA值分别为1.80、2.16和1.83 m~2/kg。(2)不同年龄毛竹不同时期的LDMC的变化趋势不同,Ⅰ度竹LDMC随着毛竹扩展呈降低的趋势;Ⅱ和Ⅲ度竹LDMC呈升高的趋势。(3)随着毛竹的扩展,叶碳含量(LC)、叶氮含量(LN)、碳氮比(C/N)的变化差异不明显,叶磷含量(LP)呈降低的趋势,分别为1.70、1.53和1.15 g/kg;碳磷比(C/P)呈升高的趋势,分别为264.06、292.33、392.03;氮磷比(N/P)呈升高的趋势,分别为12.70、13.62和17.16。【结论】随着毛竹向撂荒地扩展,SLA先升后降,Ⅰ度竹LDMC降低,Ⅱ和Ⅲ度竹LDMC升高,LP降低,C/P和N/P升高,毛竹主要叶功能性状随着环境的变化发生了适应性改变。毛竹通过降低SLA和N/P,增加LP含量来适应扩展前期剧烈变化的环境条件。随着毛竹的扩展和林分环境的形成,毛竹叶N/P增加,生长由受N制约变化为受P元素制约。Ⅰ、Ⅱ、Ⅲ度毛竹LDMC随着毛竹扩展的变化规律不同,使毛竹能够在扩展过程中更好地保有资源,具有“集团”优势,能更灵活地利用资源。 【Objective】 The objective of this study was to explore the adaptive characteristics and survival strategies of leaves in the expansion process of Moso bamboo forest and to provide a basis for the proper regulation of its expansion. 【Method】 The leaf area ratio (SLA), leaf dry matter content (LDMC) and main leaf nutrient elements and the isoflavone-leaf functional traits at different extension stages were compared with the extended boundary of the bamboo-wasteland. 【Result】 (1) With the expansion of Moso bamboo, the SLA firstly increased and then decreased, and the SLA values ​​of early, middle and late stages were 1.80, 2.16 and 1.83 m ~ 2 / kg, respectively. (2) The trend of LDMC in Moso bamboo at different ages was different. The LDMC in I degree bamboo decreased with the extension of Moso bamboo and the LDMC in II and III bamboo showed an increasing trend. (3) With the extension of Phyllostachys pubescens, leaf carbon content (LC), leaf nitrogen content (LN) and carbon / nitrogen ratio (C / N) showed no significant difference but leaf phosphorus content 1.70, 1.53 and 1.15 g / kg, respectively. The P / C ratio increased at 264.06, 292.33 and 392.03, respectively. The N / P ratio showed an increasing trend, which was 12.70 and 13.62 And 17.16. 【Conclusion】 With the expansion of Moso bamboo to fallow land, the SLA increased first and then decreased. The LDMC of I degree bamboo decreased, while that of II and III increased, LP decreased and C / P and N / P increased. Adaptations change as the environment changes. Bamboo reduced the SLA and N / P, increased LP content to adapt to the dramatic changes in the early expansion of environmental conditions. With the expansion of bamboo and the formation of forest stand, the N / P of Phyllostachys pubescens increased, and the growth was controlled by P and restricted by the N control. The order of variation of LDMC of Ⅰ, Ⅱ and Ⅲ degrees bamboo varies with the extension of the bamboo so that the bamboo can better retain the resources in the expansion process, has the advantage of “group” and can utilize resources more flexibly.