Critical tidal level for forestation with hypocotyl of Rhizophora stylosa Griff along the Guangxi coast of China |
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Authors: | Binyuan He Tinghe Lai |
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Institution: | (1) Guangxi Mangrove Research Center, Beihai, 536007, China |
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Abstract: | From August 2004 to August 2005, three replicate experimental platforms were constructed in a section of the tidal flats in
Yingluo Bay, Guangxi Province to study the growth and physiological responses of Rhizophora stylosa Griff seedlings to tidal waterlogging stress in a diurnal tidal zone. A total of eight tidal flat elevation (TFE) treatments,
i.e., 320, 330, 340, 350, 360, 370, 380 and 390 cm above Yellow Sea Datum (YSD), were created on each platform. The results
showed that lower TFEs (320–330 cm YSD) slightly increased the seedling stem height of 1-year old seedlings, while higher
TFEs (>340 cm YSD) increased the seedling growth significantly. Moderate TFEs (350–370 cm YSD) favored the development of
knots. Number of leaves, leaf conservation rate and leaf area per seedling all decreased dramatically with decreasing TFE.
Lower TFEs caused large damage to Chl a, but Chl b was less affected. The Chl a/b ratio decreased with decreasing TFE. Prolonged
waterlogging induced higher SOD activity in roots, while moderate TFE inhibited the SOD activity in leaves. The POD activity
in roots and leaves increased with decreasing TFE. Waterlogging stress decreased the biomass of individual organs and entire
seedlings. With increasing waterlogging, the biomass partitioning in 1-year old seedlings increased from leaf to stem. The
survival rate decreased sharply from 88.9% to 40.0% as TFE decreased, while more than 80% of the seedlings were able to survive
at the TFE level of 370 cm YSD and above. We propose that the local mean sea level should be adopted as the critical tidal
level for forestation with hypocotyls of R. stylosa along the Guangxi coast. |
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Keywords: | Rhizophora stylosa Griff diurnal tidal zone tidal flat elevation waterlogging stress physiological response critical tidal level for forestation |
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