Open AccessStudy on New Seagrass Bed at the Coastal Area of Yellow River Estuary in Dong Ying
Author(s) -
Ran Zhou,
Sheng Zhao,
Donghui Xu,
Song Shi,
Xiaoyang Jian
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/514/3/032054
Subject(s) - seagrass , estuary , salinity , freshwater inflow , environmental science , zostera marina , intertidal zone , biomass (ecology) , oceanography , bay , hydrology (agriculture) , ecosystem , fishery , ecology , geology , biology , geotechnical engineering
Seagrass resource is an important part of the Marine ecosystem, eelgrass resources worldwide recession received extensive attention of the world. Through the tracking of Yellow River Estuary in Dong Ying, we found a piece of seaweed bed, new types of seaweed for short eelgrass ( Zostera japonica Asch. et Graebn), which are mainly distributed in the intertidal zone. During the investigation, seaweed cover increases by 0.54 km 2 to 0.54 km 2 . In the year to August 2015, the biomass is 322.13 g/m 2 , stem branch density of 794 plants/m 2 . The rise and fall of seaweed bed is closely related to the water environment changes. Through the study of multiple environmental factors influence on short eelgrass life state, we found that salinity has enormous influence on the growth of eelgrass. In the five salinity conditions which the temperature is 20 °C, the net oxygen production and the activity of ribulose-1, 5-diphosphate carboxylase were the highest when the salinity was 19.459, and the photosynthesis intensity decreased when the salinity was higher or lower than this value. According to the survey, from 2002 to 2014, the inflow of the Yellow River Estuary increased from less than 5 billion cubic meters to nearly 30 billion cubic meters. Therefore, the increase of the sea water amount of the Yellow River and the decrease of the salinity in the estuarine waters are the important reasons for the growth of the seagrass bed.