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The relationship of species and abundance between the diatoms in the water and sediments from the southern South China Sea (SCS)were discussed, and the key environmental controlling factors were also investigated. Studies show thathe diatom abundance is high in both water andsediments in the southeast part of the southern SCSand the varying trend is similar, while in the northwespart, the abundance is low, and the varying trend isdifferent. The dominant diatom species are Thalassionema nitzschioides and Nitzschia bicapitata inwater, and T. nitzschioides and Chaetoceros messanensis in sediments. The diatom species of smalsize and thin shell in water are more than in thesediments, while the diatom species of large size andthick shell in water are less. The percentage of species T. nitzschioides is higher in water of southeaspart than in that of northwest part, but it is similar insediments of both areas. It is shown that the southwest monsoon is the important factor influencingdiatom abundance and T. nitzschioides percentageand when the southwest monsoon is well developedthe distribution of diatom abundance and T. nitzschioides percentage are consistent in both water andsediments of the study area.
The relationship of species and abundance between the diatoms in the water and sediments from the southern South China Sea (SCS) were discussed, and the key environmental controlling factors were also investigated. Studies show thathe diatom abundance is high in both water and sediments in the southeast part of the southern SCS and the varying trend is similar, while in the northwespart, the abundance is low, and the varying trend is different. The dominant diatom species are Thalassionema nitzschioides and Nitzschia bicapitata inwater, and T. nitzschioides and Chaetoceros messanensis in sediments. The diatom species of smalsize and thin shell in water are more than in thesediments, while the diatom species of large size andthick shell in water are less. The percentage of species T. nitzschioides is higher in water of southeaspart than in that of northwest part, but it is similar insediments of both areas. It is shown that the southwest monsoon is the important factor influencingdiatom abu ndance and T. nitzschioides percentage and when the southwest monsoon is well developed the distribution of diatom abundance and T. nitzschioides percentage are consistent in both water and parts of the study area.