红树植物改造桐花树次生灌木林效果的研究

通过对16a生的木榄、红海榄、海莲红树植物在桐花树次生灌木群落中进行人工改造的形成的新群落调查与分析,结果表明:海莲、红海榄和木榄都能成功在桐花树灌木林群落定居,其中以木榄的地径、树高生长量较大;红海榄、海莲的造林的株行距为1m×1m或0.8m×1m,木榄的株行距为1.5m×2m为宜;引入红树林乔木树种海莲、红海榄、木榄小苗16年后,桐花树密度呈不同程度的减少,其中木榄的引入较不利于桐花树次生灌木群落的发展;海莲、红海榄各自生物量或群落总生物量均比桐花树群落总生物量增加,以红海榄的生物量增加量最大,为桐花树群落总生物量的1.9倍;海莲、木榄具有良好的更新状况,特别在海莲群落中,平均每方米超过2株幼苗,说明该群落开始步入发育盛期,可以预见未来的15年内,可使红树林群落茂密复生。

Research on transform and optimum technology of the secondary shrub forest of mangrove plant Aegiceras corniculatum Blanco

We investigated and analyzed the new community of B.gymnorrhiza(L.) Lamk,Rhizophora stylosa Griff and Brugiera sexangula(Lour)Poir which were sixteen years old and transformed from the secondary shrub forest of Aegiceras comiculatum Blanco. The results show that three kinds of mangrove plants all can settle in the Aegiceras comiculatum Blanco shrubs community,and B. gymnorrhiza(L.) Lamk have the maximum stem and higher growth rate.The appropriate forestation density for Rhizophora stylosa Griff and Brugiera sexangula(Lour)Poir is 1m×1m or 0.8m×0.8m,and 1.5m×2m is suitable for B.gymnorrhiza(L.) Lamk.The density of Aegiceras comiculatum Blanco was declining in varying degrees after introducing the B.gymnorrhiza(L.) Lamk,Rhizophora stylosa Griff and Brugiera sexangula(Lour)Poir sixteen years ago,and introducing of the B.gymnorrhiza(L.) Lamk is worst for the growth of the the secondary shrub forest of Aegiceras comiculatum Blanco.The biomass of Rhizophora stylosa Griff and the total biomass of community was more than the total biomass augment of the Aegiceras comiculatum Blanco community.The biomass augment of Rhizophora stylosa Griff was most,and it was 0.9 times more than the total biomass of Aegiceras comiculatum Blanco community. Brugiera sexangula(Lour)Poir and B.gymnorrhiza(L.) Lamk both have good renewal states,especially there was more than two plants seedlings/m² in the Brugiera sexangula(Lour)Poir community.It indicates that Brugiera sexangula(Lour)Poir community was on the point of maximum development,and it can predict that mangrove community would resurge about fifteen years in the future.