Patterns of variation in hydraulic traits of Lannea coromandelica with different diameters at breast height in Yuanjiang,Yunnan Province
In order to investigate the variation patterns of hydraulic traits of trees with different diameters at breast height(DBH)grades,we focused a dominant tree species(Lannea coromandelica)in the dry and hot ecosystem of the Yuanjiang,and measured the distribution patterns of hydraulic traits including shoot(leaf and stem),leaf,and stem hydraulic conductance,and morphological properties(DBH,leaf area/petiole length,leaf area/mass of petiole,mass of leaf/mass of petiole,average petiole length,bark density,wood density,Huber value and leaf mass per area)for 56 L.coromandelica individuals with different DBH grades(0＜DBH≤9 cm),and then discussed the variation patterns of these traits among three DBH grades(0＜DBH≤3,3＜DBH≤6 and 6＜DBH≤9 cm).The results were as follows:(1)The stem hydraulic conductance was significantly greater than leaf hydraulic conductance in three DBH grades,indicating that there was a hydraulic segmentation between the stem and leaf,whereas the degree of hydraulic segmentation had a similar pattern.(2)Among the three DBH grades,there were significant differences in morphological traits such as average petiole length,bark density,wood density,Huber value and leaf mass per area,but there were no significant differences in the hydraulic conductance of the shoot,stem,and leaf.(3)Among the three DBH grades,the shoot hydraulic conductance was positively correlated with leaf and stem hydraulic conductance,indicating there was a coordination between leaf and stem hydraulic conductance.The stem hydraulic conductance was negatively correlated with bark density and positively with wood density,and leaf hydraulic conductance was significantly negatively correlated with the Huber value,indicating these leaf and stem morphological traits may impact shoot and leaf hydraulic conductance.Overall,this study suggests that there are similar hydraulic distribution patterns between leaf and stem of L.coromandelica at different growth stages,although some morphological traits differ significantly among different diameter grades.These results have important physiological significance for understanding the water transport mechanism in plants.
hot and dry valleyhydraulic traitsmorphological traitshydraulic segmentationwater transport
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