Figure 1: Changes in the plant height increment of different
mangrove species under various light intensities, seawater salinities,
and flooding times. The K. obovata seedlings died under the S3
and S4 treatments, and no data are shown.
The effects on the
biomass accumulation
Under different light intensities, the biomass accumulation of the six
mangrove species showed significant differences (P <
0.01; Figure 2). The K. obovata , A. marina , and R.
stylosa seedlings accumulated more biomass under the G1 treatment and
showed a gradually decreasing trend with decreasing light intensity. TheA. corniculatum , C. tagal , and B. sexangulaseedlings exhibited larger biomass accumulation under the G2 treatment;
they first increased and then decreased with the decrease of light
intensity. These results demonstrate that too high or too low light
intensity can inhibit the biomass accumulation of seedlings.
Under different flooding times, the biomass accumulations of the six
mangrove species were significantly different (P <
0.01; Figure 2), all showing a trend of first increasing and then
decreasing. The A. marina , A. corniculatum , and R.
stylosa seedlings all had the largest biomass accumulation under the T3
treatment, while K. obovata , C. tagal , and B.
sexangula seedlings had the largest biomass accumulation under the T2
treatment, indicating that too short or too long flooding time can
inhibit the biomass accumulation of seedlings.
Under different seawater salinities, the biomass accumulations of the
six species were significantly different (P < 0.01;
Figure 2). The biomass accumulations of K. obovata , C.
tagal , and B. sexangula seedlings all showed a gradually
decreasing trend, with the largest biomass accumulation under the S1
treatment. The biomass accumulations of A. marina , A.
corniculatum , and R. stylosa seedlings first increased and then
decreased, with the largest biomass accumulation under the S2 treatment.
These results indicate that too high or too low seawater salinity can
inhibit the biomass accumulation of seedlings.