Study On The Growth Characteristics Of Kandelia Candel In Yanpu Bay And Its Relationship With Sediments

In order to understand and further grasp the growth and development status and sediment quality characteristics of candel forests in the Yanpu Bay in Cangnan,Zhejiang,so as to better guide the production practices of candel forests,especially the restoration practices of candel forests and the prevention and control of heavy metals in the wetlands of candel plantations.The protection and restoration of the forest ecosystem provide theoretical basis,and then provide scientific and technological support for the planning and implementation of the construction,operation and development of the special marine reserve,in the hope that the construction of the candel forest ecosystem can realize the protection and construction of a good coastal zone in the Yanpu Bay and marine ecosystems.In this paper,the artificially introduced Kandelia candel forests(three provenances in Jiulong River in Fujian,Yunxiao provenance and Shenzhen in Guangdong)and their sediments,which were introduced and planted in the Yanpu Bay,were studied.Similarly,the differences in the growth of Kandelia candel,the pollution status and ecological risks in the Yanpu Bay were evaluated,and the mechanism of influence between Kandelia candel growth and sediment quality was preliminarily discussed.The main results are as follows:(1)There are certain differences in the growth of Kandelia candel in the 7 plots;seedlings should be purchased from a provenance that is close to the climate of the planned planting area;the subtropical climate difference in Cangnan,Zhejiang has an effect on the height,ground diameter and number of leaves of Kandelia candel.The regression model of Candelas has little effect,and the regression model of plant height is still applicable to Candelia candel in southern Zhejiang;Candelas candelensis should be planted in mudflat areas with weak hydrodynamics,and the habitat should be properly modified before planting.At the same time,attention should be paid to tidal water and barnacles and other fouling organisms.Coercive influence(2)The Kandelia candel has been improved to a certain extent after planting.In the summer of 2017 and the autumn of 2019,the quality of sediments in the Yanpu Bay was generally good.Cu was the main pollution,and its content exceeded the "Marine Sediment Quality"(GB18668-2002).)The first category standard,followed by Zn,and the other environmental factors all meet the first category standard,and the pollution degree of 7heavy metals is relatively light;the single factor pollution index of heavy metals and the geo-accumulation index result are the same: Cu and Zn are the main pollution factors;The potential ecological hazard coefficients are with mercury and cadmium the largest.(3)Different provenances of Kandelia candel have a certain difference in the ability to absorb heavy metals;Hg and As have a greater influence on the growth of Kandelia candel.