巴郎山异型柳叶片功能性状及性状间关系对海拔的响应
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四川省林业科学研究院,中国林科院森环森保所,中国林科院森环森保所,中国林科院森环森保所,中国林科院森环森保所,四川省林业科学研究院,四川省林业科学研究院

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国家自然科学基金面上项目(30771718);中国林科院中级公益性科研院所基本科研业务费专项资金项目(CAFRIF200717); 林业公益性行业科研专项(200804001)资助


Response of leaf functional traits and the relationships among them to altitude of Salix dissa in Balang Mountain
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Sichuan Academy of Forestry,,Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry,,,,

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    摘要:

    在卧龙自然保护区,按海拔梯度选择了4个异型柳分布地点(2350 m、2700 m、3150 m和3530 m),对各研究地点异型柳进行了叶片光合、CO2扩散导度(气孔导度(gs)和叶肉细胞导度(gm))、δ13C、氮素以及比叶面积(SLA)等参数的测量,以期揭示该植物叶片功能性状及功能性状间关系的海拔响应情况.结果表明:随着海拔的升高,大气温度和压强的降低,异型柳的叶片单位面积氮含量(Narea)、最大羧化速率(Vcmax)和最大净光合速率(Amax)均随之增加,这可能是该落叶灌木对于生长季节缩短的一种响应;同时,植物的光合氮利用效率(PNUE)和SLA却均随海拔降低,原因可能在于随着海拔的升高,植物将越来越多的氮素用于细胞壁等非光合组织的构建,这是高海拔植物对于外界恶劣环境的一种适应;最后,扩散导度和羧化能力是植物叶片δ13C的主要影响因子,而羧化能力较扩散导度对于异型柳叶片δ13C的作用更大些,进而导致该值呈现随海拔升高的趋势.氮素在光合与非光合系统间的分配是巴郎山异型柳适应不同海拔生境的关键.

    Abstract:

    The relationship between plant and environment is always one of key issues in the field of ecology. Attentions have been paid to plant functional traits and the responses of some traits to environment have been found since 19th century. Many researches at different scales have proved that plant functional trait, especially leaf functional trait, is a useful tool for linking plant and environment. However, the relationships among plant functional traits are more stable and more meaningful than the relationships among the traits and environment. Study on the responses of plant leaf functional traits and the relationships among them to altitude gradients is helpful to know how plants responding and adapting a changing environment. Foliar traits on photosynthesis, diffusional conductance to CO2 (including stomatal conductance (gs) and mesophyll conductance (gm)), carbon isotope ratio (δ 13C), nutrient content and morphology of Salix dissa shrub in four sites with different altitudes (2350m, 2700m, 3150m and 3530m) from Balang Mountain were measured and analyzed in order to understand how leaf functional traits and the relationships among them of the species responded to altitudinal gradients. The results showed that leaf nitrogen content per area (Narea), maximum rate of carboxylation (Vcmax) and maximum photosynthetic rate (Amax) increased with decrease of air temperature and air pressure along with altitude increasing. It was likely the response of the deciduous shrub to shorter growing season at higher altitude. However, photosynthetic nitrogen use efficiency (PNUE) and specific leaf area (SLA) decreased with altitude probably because S. dissa allocated more and more nitrogen to non-photosynthetic system, such as cell wall and so on as a kind of adaptation of plants to severe environment. Diffusion conductance (gs and gm) and carboxylation capacity were main factors on foliar carbon isotope discrimination, but Vcmax had more important effect on leaf δ 13C than diffusion conductance did. It resulted in leaf δ 13C of S. dissa increasing with altitude. It was obvious that allocation of nitrogen between photosynthetic system and non-photosynthetic system was a key factor on the adaptation of S. dissa to a changing environment at different altitude Balang Mountain.

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冯秋红,程瑞梅,史作民,刘世荣,王卫霞,刘兴良,何飞.巴郎山异型柳叶片功能性状及性状间关系对海拔的响应.生态学报,2013,33(9):2712~2718

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