Temporal and spatial distribution characteristics of chlorophyll a and primary productivity of the waters around Miaodao Archipelago
SUN Jing
HE Xin
JIN Yang
ZHAO Yuting
XING Hongyan
YOU Liping
SUN Shan
Abstract：Chlorophyll a(Chl-a)and primary productivity were measured during four expeditions to Miaodao Archipelago in August and October,2018,April and June,2019,to characterize their tempo-ral and spatial distribution,and analyze the correlation among Chl-a,primary productivity and main environmental factors.The results showed that the concentration of Chl-a is generally higher in south than in north,and change seasonally.The highest value appeared in June while the higher appeared in August followed that in October and the lowest appeared in April with the average of 4.19±0.75 μg·L-1,0.79±0.41 μg·L-1,0.75±0.37 μg·L-1 and 0.27±0.07 μg·L-1,respectively.High value of pri-mary productivity mainly occurred in the northeastern part of the surveyed area,which varied seasonal-ly.The primary productivity in June was the highest,with an average of 801.86±627.97 mgC·m-2·d-1,followed by 204.84±118.76 mgC·m-2·d-1 in August,102.19±77.41 mgC·m-2·d-1 in October and 32.07±13.25 mgC·m-2·d-1 in April.Correlation analysis among chlorophyll a,primary pro-ductivity and main environmental factors showed that nutrient is the important factor affecting the dis-tribution of chlorophyll a around Miaodao Archipelago,and the distribution of primary productivity is closely related to dissolved inorganic nitrogen.
Keywords：Miaodao Archipelagochlorophyll aprimary productivitytemporal and spatial distribu-tion
Publication Date：2025-06-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 194-201 )