西北林学院学报2025，Vol.40Issue(4)：21-28,8.DOI:10.3969/j.issn.1001-7461.2025.04.03
不同林龄杨树不同冠层与侧枝层的光合变化规律
Photosynthetic Changes in Different Canopies and Lateral Branches of Poplar Trees of Different Ages
摘要
Abstract
The study aimed to investigate the effect of canopy and lateral branches on photosynthesis and leaf area of poplar trees of different ages.In this paper,poplar trees were taken as experimental objects,and different canopy layers were divided according to three kinds of poplar trees of different ages(6,12,and 18 years old).The primary lateral branches of the canopy were stratified from the outside to the inside to ana-lyze photosynthetic characteristics,leaf area and water use efficiency(WUE),and the differences in photo-synthetic characteristics of leaves of different canopy layers and lateral branches of poplar trees of different ages were systematically studied.The results showed as follows:1)The photosynthetic characteristics of the same age increased significantly with the increase of canopy,and the lateral branches increased gradual-ly from inside to outside(P＜0.01).2)In canopy 4 and 5,except for WUE value,photosynthetic parame-ters of 18-year-old were higher than those of 12-year-old,Pn value was higher by 16.96％,Gs value was higher by 54.50％and Tr value was higher by 32.52％;In the canopy 3,the highest water utilization rate of 12-year-old was 4.678％and 25.447％,respectively,higher than that of 18-year-old and 6-year-old.3)There were significant differences in the photosynthetic parameters of leaves at different branches of the crown in the three kinds of age,showing that the upper branch＞the middle branch＞the lower branch.4)Net photosynthetic rate was significantly positively correlated with Gs,Tr and WUE(P＜0.01),and was significantly positively correlated with specific leaf area(P＜0.05).关键词
杨树/林龄/冠层/光合特性Key words
Populus/age of stand/canopy layer/photosynthetic characteristics分类
农业科技引用本文复制引用
王力冉,刘晓婷,张太进,由义敏,王福森,赵曦阳..不同林龄杨树不同冠层与侧枝层的光合变化规律[J].西北林学院学报,2025,40(4):21-28,8.基金项目
国家"十四五"重点研发项目(2021YFD2201204). （2021YFD2201204）
