摘要
该文通过比较油松和侧柏的蒸腾特性,为北京生态涵养带抗旱树种的筛选提供基础数据。采用Li--6400型便携式光合仪在2006年5—10月对北京市密云水库典型针叶林(油松和侧柏)的蒸腾速率进行了测定。结果表明,油松和侧柏的日平均蒸腾速率分别为2.18和1.95mmol/(m2.s),日平均水分利用率分别为3.52和3.04μmol/mmol。油松和侧柏的水分利用率均在11:00时达到峰值,光合速率的变化趋势均为单峰曲线,且在12:00前后达到峰值。因此,油松和侧柏作为北京山区两种典型针叶树种具有相似的蒸腾特性,油松的日平均蒸腾速率和水分利用率均略高于侧柏,蒸腾作用受环境因子综合影响,气孔导度是影响油松和侧柏蒸腾速率的主要因子。
The objective of this study is to provide references for the selection of afforestation tree species with drought resistance and lower water consumption in ecological conservation areas in Beijing through a comparison of transpiration characteristics of Pinus tabulaeformis and Platycladus orientalis.A portable photosynthesis system Li--6400 was used to measure the transpiration rate of the two species from May to October,2006 in Miyun Reservoir of Beijing.The results show that for the two species,1)the daily average transpiration rate was 2.18 and 1.95 mmol/(m2·s);2)the daily average water use efficiency was 3.52 and 3.04 μmol/mmol;3)the water use efficiency culminated at 11:00,and the photosynthetic rate presented a single-peak curve with a peak value appearing around 12:00.The results suggest the two species have similar transpiration characteristics except that the daily average water use efficiency of Pinus tabulaeformis is slightly higher than that of Platycladus orientalis.The transpiration rate was affected synthetically by environmental factors,and largely by stomatal conductance.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2008年第S2期193-196,共4页
Journal of Beijing Forestry University
基金
北京市科委重大项目(D0706001000091)
“十一五”国家科技支撑计划课题(2006BAD03A02)
国家林业科技支撑计划项目(2006BAD03A18)
关键词
油松
侧柏
蒸腾速率
水分利用率
气孔导度
光合速率
拟合模型
Pinus tabulaeformis
Platycladus orientalis
transpiration rate
water use efficiency
stomatal conductance
photosynthetic rate
fitting model
