Ya P. Chen, Yong Ye.Marine Ecology Progress Series,2013.
482: 107-118.
Differences in growth and physiological
characteristics of saplings ofAvicennia
marinaandKandelia obovatawere
compared among 3 intertidal elevations. Growth performance of A. marina
generally followed the order of the middle > lower > upper elevation. At
the middle elevation,A. marinahad
maximum values of tree height, branch number, crown length and diameter, shoot
biomass and shoot to root biomass ratio (S:R). Differently, K. obovata
exhibited best growth at the upper elevation, followed by the middle and lower
elevation. Except for shoot biomass and S:R, all growth parameters ofK. obovatashowed a tendency to decline
continuously with decreasing elevation. These different responses between the 2
species indicated thatA. marinais more tolerant to low elevation thanK.
obovata. Decreasing elevation did not compromise gas exchange ofA. marinaleaves, while net
photosynthetic rate, transpiration rate, stomatal conductance and intercellular
CO2concentration ofK.
obovataleaves declined sharply as the elevation decreased. Leaf
chlorophyll (chl) a:b ratio and contents of chla, total chl and total carotenoid showed no significant differences
among elevations for both species. With decreasing elevation, activities of
superoxide dismutase and peroxidase increased significantly for both species,
while significant increase in malonaldehyde contents was only recorded forK. obovata. With decreasing elevation,
proline accumulation in leaves was accelerated for A. marina but not forK. obovata. These physiological
responses also confirmed that A. marina is more tolerant to low intertidal
elevation thanK. obovata.
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