Background： Progress of forest production in response to the environment requires a quantitative understanding of leaf area development. Therefore, it is necessary to investigate the dynamics of seasonal crown foliag...Background： Progress of forest production in response to the environment requires a quantitative understanding of leaf area development. Therefore, it is necessary to investigate the dynamics of seasonal crown foliage in order to understand the productivity of mangroves, which play an important role in the subtropical and tropical coastlines of the world. Method： Crown foliage dynamics of the mangrove Rhizophora styloso were studies to reveal patterns of leaf recruitment, survival and seasonal leaf area growth. Results： Flushing of leaves occurred throughout the year, but both flushing and leaf area growth pattern of leaves varied with season. Maximum flushing occurred in summer, but leaf areas did not differ significantly with season. The half-expansion period is longer, and the intrinsic rate of increase was lower in winter. Summer flushed leaves grew faster at their initial stage and reached their maximum area over a shorter period of time. The difference in temperature and air vapor pressure deficit （VPD） between summer and winter contributed to the present dynamics of foliage patterns. The mean leaf longevity was estimated to be 13.1 month. The crown foliage area was almost stable throughout the year. Conclusions： Homeostatic control of the crown foliage area may be accompanied by the existence of ecophysiological mechanisms in R. stylosa. Integrating crown foliage dynamics into forest models represents an important step towards incorporating physiological mechanisms into the models for predicting growth responses to environmental changes and for understanding the complex responses of tree growth and litter production.展开更多
This paper deals with the distribution pattern type,aggregative intensity,pattern scaleand dynamics of plant populations of Rhizophora stylosa community in Yingluo Bay of Guangxi.The measured results show that R.stylo...This paper deals with the distribution pattern type,aggregative intensity,pattern scaleand dynamics of plant populations of Rhizophora stylosa community in Yingluo Bay of Guangxi.The measured results show that R.stylosa population is an aggregated distribution,while thepopulations of Kandelia candel,Bruguiera gymnorrhiza and Aegiceras corniculatum appear asrandom distribution.The plant population distribution pattern changes,along with the populationdevelopment and the succession of the community.展开更多
Ten compounds were isolated from the leaves of Rhizophora stylosa,one kind of mangrove plants distributed in the tropical and subtropical areas of the world.Their structures were identified as taraxerone（1）,taraxero...Ten compounds were isolated from the leaves of Rhizophora stylosa,one kind of mangrove plants distributed in the tropical and subtropical areas of the world.Their structures were identified as taraxerone（1）,taraxerol（2）,β-sitosterol（3）,careaborin（4）,cis-careaborin（5）,β-daucosterol（6）,isovanillic acid（7）,protocatechuic acid（8）,astilbin（9） and rutin（10）,among which compound 9 and 10 were reported in this plant for the first time.Of these compounds,compound 2 has been confirmed to have the abilities to inhibit the growth of Hela and BGC-823 with IC50 of 73.4 μmol·L-1 and 73.3 μmol·L-1,respectively.Compound 5 could inhibit the growth of BGC-823 and MCF-7 with IC50 of 45.9 μmol·L-1 and 116.0 μmol·L-1,respectively.Compound 9 and 10 were firstly reported to stimulate the proliferation of mice splenic lymphocytes markedly in a dose-dependent manner.展开更多
基金financed in part by a Grant-in-Aid for Scientific Research(No.23380094) from the Ministry of Education,Culture,Sports, Science and Technology,Japan
文摘Background： Progress of forest production in response to the environment requires a quantitative understanding of leaf area development. Therefore, it is necessary to investigate the dynamics of seasonal crown foliage in order to understand the productivity of mangroves, which play an important role in the subtropical and tropical coastlines of the world. Method： Crown foliage dynamics of the mangrove Rhizophora styloso were studies to reveal patterns of leaf recruitment, survival and seasonal leaf area growth. Results： Flushing of leaves occurred throughout the year, but both flushing and leaf area growth pattern of leaves varied with season. Maximum flushing occurred in summer, but leaf areas did not differ significantly with season. The half-expansion period is longer, and the intrinsic rate of increase was lower in winter. Summer flushed leaves grew faster at their initial stage and reached their maximum area over a shorter period of time. The difference in temperature and air vapor pressure deficit （VPD） between summer and winter contributed to the present dynamics of foliage patterns. The mean leaf longevity was estimated to be 13.1 month. The crown foliage area was almost stable throughout the year. Conclusions： Homeostatic control of the crown foliage area may be accompanied by the existence of ecophysiological mechanisms in R. stylosa. Integrating crown foliage dynamics into forest models represents an important step towards incorporating physiological mechanisms into the models for predicting growth responses to environmental changes and for understanding the complex responses of tree growth and litter production.
文摘This paper deals with the distribution pattern type,aggregative intensity,pattern scaleand dynamics of plant populations of Rhizophora stylosa community in Yingluo Bay of Guangxi.The measured results show that R.stylosa population is an aggregated distribution,while thepopulations of Kandelia candel,Bruguiera gymnorrhiza and Aegiceras corniculatum appear asrandom distribution.The plant population distribution pattern changes,along with the populationdevelopment and the succession of the community.
文摘Ten compounds were isolated from the leaves of Rhizophora stylosa,one kind of mangrove plants distributed in the tropical and subtropical areas of the world.Their structures were identified as taraxerone（1）,taraxerol（2）,β-sitosterol（3）,careaborin（4）,cis-careaborin（5）,β-daucosterol（6）,isovanillic acid（7）,protocatechuic acid（8）,astilbin（9） and rutin（10）,among which compound 9 and 10 were reported in this plant for the first time.Of these compounds,compound 2 has been confirmed to have the abilities to inhibit the growth of Hela and BGC-823 with IC50 of 73.4 μmol·L-1 and 73.3 μmol·L-1,respectively.Compound 5 could inhibit the growth of BGC-823 and MCF-7 with IC50 of 45.9 μmol·L-1 and 116.0 μmol·L-1,respectively.Compound 9 and 10 were firstly reported to stimulate the proliferation of mice splenic lymphocytes markedly in a dose-dependent manner.
