摘要
对胡杨光合速率和蒸腾速率同各主要影响因子间相关关系进行了研究。结果表明:胡杨光合速率和气孔导度间呈对数关系,蒸腾速率与气孔导度间呈线性关系;两者与光合有效辐射均呈多项式关系;与空气温度均呈二项式关系。结果说明胡杨属气孔限制型植物,气孔导度和光合有效辐射共同决定胡杨的光合和蒸腾作用。气温和相对湿度通过影响胡杨的气孔导度进而影响胡杨的光合速率和蒸腾速率。适宜胡杨进行光合气体交换的环境条件是光合有效辐射保持在1700μmol.m-2.s-1左右,温度保持在35℃左右,相对湿度保持在20%-30%间。
In this research we studied correlations between the photosynthetic and transpiration rate of Populus euphratica and their affecting factors. Results showed that photosynthetic rate was logarithmically related to stomatal conductance; The relation between transpiration rate and stomatal conductance was lineal. They both polyno-mially associated with photosynthetically active radiation, and binomially with air temperature. There also indica- ted that P. euphratica belonged to the plants limited by stomata. Stomatal conductance and photosynthetically ac- tive radiation commonly decided the magnitude of photosynthetic and transpiration rate. Air temoerature, and rein-tive humanity affected them by means of stomatal conductance. The conditions that P. euphratica adapt to photo- synthetic gas exchange were that photosynthetically active radiation kept about 1700μmol·m^-2·s^-1, temperature was nearly 350℃ and relative humanity was 20% -30% or so.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2012年第4期155-159,共5页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(40901048,40801001)
国家社会科学基金(08XJY012,10CJY015)
青海师范大学科技创新计划项目共同资助
关键词
胡杨
光合
蒸腾
关系
Populus euphratica
photosynthesis
transpiration
relationship
