中文摘要：

以天童国家森林公园太白山顶旷地生境和木荷林林下生境18种主要常绿与落叶树种为对象,研究了单位面积叶干重（LMA）、单位叶干重氮含量（N_（mass））、叶细胞壁氮素分配比率（N_（cw）/N_m）和单位叶干重最大净光合速率（A_（mass））在2个生境中的差异及各指标间的关系。结果表明：1）旷地生境各树种间的LMA显著高于林下生境,A_（mass）则显著低于林下生境,N_（mass）、Ncw）/Nm在两种生境中差异不显著;落叶树种具有较小的LMA、较小的Ncw/Nm及较高的A_（mass）,未受到光抑制;常绿种具有较大的LMA和Ncw/Nm,在旷地受到显著光抑制。2）2种生境中LMA与N_（mass）、A_（mass）呈显著负相关,与Ncw/Nm呈显著正相关,N_m与A_（mass）呈显著正相关。3）从林下生境到旷地生境,常绿树种表现为维持生长、延长叶寿命为主的适应策略,而落叶树种表现为以提高资源利用效率为主的适应策略。

英文摘要：

Four leaf functional trait indexes [leaf dry mass per area（LMA）, leaf nitrogen concentration per unit mass（N（mass））, leaf nitrogen allocation proportion in cell wall（N（cw）/Nm） and mass-based maximum photosynthetic rate（A（mass））] were measured in 18 evergreen and an deciduous broad-leaved tree species from Taibai mountain-peak open habitat and from Schima superba forest understory habitat in Tiantong National Forest Park. The results showed that Amass of the trees was lower but LMA was higher in the open habitats than those in the understory habitats. Nmass and N（cw）/Nm of the trees were not significantly different between the two habitats; deciduous tree species possessed smaller LMA, N（cw）/Nm and higher Amassthan evergreen species, and the photoinhibition happened severely in open habitat for the evergreen tree species. More nitrogen was used to protect the photosynthetic system and defense system. LMA was negatively correlated with Nmass and Amass, while it was positively correlated with N（cw）/Nm; Amass and Nmass were positively correlated in both habitats. Our results indicated in the understory habitat, the evergreen tree species showed adaptive strategies characterized by persistence and maintaining survival, extending leaf lifespan and increasing N investments in cell walls, but in the open and dry habitat the deciduous tree species showed adaptive strategies characterized by high nitrogen-use efficiency.