Effects Of Different Conservation Intensities On Biodiversity Of Benthic Macro-algae In The Intertidal Zone Of Nanji Islands

Several sampling surveys of macrobenthic algae in intertidal zone of Nanji Islands Reserve were conducted during February 2016 to November 2017,containing8 voyages and 11 sections.The author used the Shannon-wiener index,Pielou index and Margalef index to study the species composition,flora and biomass spatial distribution of macrobenthic algae,and preliminarily obtained the biodiversity of macrobenthic algae in Nanji Islands Reserve.This paper shows that a total of 76 species macrobenthic algae are identified,of which 50 species are red algae,12 species are brown algae,and 13 species are green algae.According to the thermophilic characteristics,72%of the total species are warm-temperate species,followed by subtropical species,accounting for 21%.The algae in the reserve are mainly distributed in the low layer of 7middle-tide zone and low-tide zone,with the maximum average biomass(617.71g.m^-2)in spring and minimum(176.59g.m^-2)in autumn.The Shannon-wiener diversity index?H'?,richness index?D?and evenness index?J'?are 0.74,0.73 and 0.45,respectively,which are the largest in spring,followed by winter,and lower in summer and autumn.After comparing the average species number,biomass and diversity index of macrobenthic algae in the core area and the experimental area,the author find that the indexes in the core area are all higher than those in the experimental area.The above results show that the enhanced protection of the core area in Nanji Islands Reserve has achieved a certain effect.