摘要
以吉林农业大学校园内的6种园林树木为研究对象,将树冠由外向内分为表层(距树冠表面10cm),外层、中层和内层(各占剩余部分的1/3)。分别取上述各层的中间部位叶片(记为表层A、外层B、中层C、内层D),测定单位叶面积蒸腾速率的变化规律,探讨园林树木蒸腾速率测定的合理取样部位。结果表明:9种园林树木单位叶面积蒸腾速率的变化,均为由树冠表层向树冠内层顺次降低。表层A单位叶面蒸腾速率(Tr)是全株平均值的1.3倍,Tr(外层B)∶Tr(全株平均值)≈1∶1。因此,在测定园林树木单位叶面积蒸腾速率时,以外层B或与中层C偏向外层B处的叶片作为取样部位更为合理。
We studied the variation of transpiration rate and light intensity of unit leaf area of six kinds of landscape trees cultivated in Jilin Agricultural University. We divided the crown of each tree outside-in and named layer into four parts of 0-10 cm to the crown surface （Part A）, outer part （Part B）, middle part （Part C） and inner part （Part D）, and selected the leaves in the middle position of four parts. The variation of transpiration rate and light intensity of unit leaf area of nine kinds of landscape trees decreased from Part A to Part D. Transpiration rate in Part A of unit leaf area is 1.3 times as large as that of the average of the entire plant＇ s. The ratio of the average of the entire plant and the mean value of Part B is close to 1 ： 1. Therefore, it is reasonable to select the leaf in Part B or Part C but close to Part B as experimental materials for evaluating the transpiration rate of unit leaf area of the landscape trees.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2014年第7期24-26,55,共4页
Journal of Northeast Forestry University
基金
吉林省科技发展计划项目(20095038)
关键词
园林树木
蒸腾速率
取样部位
Landscape trees
Transpiration rate
Sampling location
