附生地衣是热带和亚热带山地森林生态系统中重要的结构性组分,在生物多样性保护、环境监测、养分循环中发挥着重要作用。附生地衣按共生藻、生活型和繁殖策略的不同可划分为不同的功能群,不同附生地衣功能群的分布格局存在较大的差异,然而其生理生态机制仍不清楚。该研究以我国西南地区哀牢山亚热带山地森林中的附生地衣优势类群为研究对象,对该地区蓝藻地衣、阔叶地衣、狭叶地衣及枝状地衣4种功能群的8种附生地衣的水分关系、光合生理特征等进行了测定分析,结果显示:不同功能群附生地衣的持水力和失水速率均存在差异,其中蓝藻地衣具有较高的最大水分含量,而枝状地衣的失水速率较快;过高和过低的水分含量都会抑制附生地衣的光合作用,但抑制程度有所差异;蓝藻地衣的光合作用最适水分含量比较高,表明它们的光合生理活动对水分条件要求较高,所以它们偏好潮湿的生境,同时蓝藻地衣的光补偿点比较低但光饱和点却不低,反映出它们具有较宽的光强适应范围,所以蓝藻地衣能够同时分布于强光和弱光生境中;枝状地衣的光合最适水分含量较低,表明它们的光合生理活动对水分条件要求不是很高,能够适应较为干旱的环境,同时枝状地衣的光补偿点和光饱和点都很高,说明它们的光合生理活动对光照条件要求比较高,所以它们广泛分布于强光生境中;阔叶和狭叶地衣的光补偿点比较高,说明它们更适应有充足光照条件的生境。 Epiphytic lichen is an important structural component of tropical and subtropical mountain forest ecosystems and plays an important role in biodiversity conservation, environmental monitoring and nutrient cycling. Epiphytic lichen according to symbiotic algae, life-style and reproductive strategies can be divided into different functional groups, different epicentire licorice functional groups of the distribution pattern there is a big difference, but its physiological and ecological mechanisms are still not clear. In this study, the dominant epiphytic lichens of subtropical mountain forests in Ailao Mountains in southwest China were studied. Eight epiphytic lichens were cultured in four functional groups of licorice, broad-leaved lichen, narrow-leaved lichen and branched lichens The results showed that there were differences in the water holding capacity and water loss rate of the epicotyls in different functional groups, in which the blue algae lichen had the highest maximum moisture content, while the loss of the branch lichen The water rate is faster; too high and too low moisture content will inhibit epiphytic lichen photosynthesis, but the degree of inhibition is different; cyanobacteria lichen photosynthesis optimum moisture content, indicating that their photosynthetic physiological activities of water conditions They are preferred to humid habitats, while the light compensation points of cyanobacteria are relatively low, but the light saturation points are not low, reflecting that they have a wide range of light intensity adaptation, so the blue-green lichen can be distributed in both light and In low light habitat, the photosynthetic dendrons had the lowest photosynthetic water content, which indicated that their photosynthetic physiological activities had less requirements on water conditions and could adapt to Dry conditions, while the light compensation point and light saturation point of the branched lichens are very high, indicating that their photosynthetic physiological activities require relatively high light conditions, so they are widely distributed in the light habitat; broad-leaved and narrow-leaved lichen light The higher compensation points indicate that they are more adapted to habitats with sufficient light conditions.