Nutrient contents of dominant seagrass species and their affecting factors in Hainan Province

Abstract

Abstract: Nutrient (N, P and Fe) contents of 〖WTBX〗Enhalus acoroides, Cymodocea rotundata〖WTBZ〗 and 〖WTBX〗Thalassia hemperichi〖WTBZ〗 dominated in the seagrass beds in Hainan were studied in this paper. The results indicated that nutrient uptake by inter-tidal seagrass was influenced by both N, P in seawater and chemical characteristics of sediments (N, P, TOC and Fe). Phosphorus concentration of seagrass, which was more sensitive to water and sediment than that of nitrogen, was positively correlated with the level of P in seawater and TOC and total Fe in sediment. Enhanced nutrient level induced by human activates has exerted imbalance of N and P uptake in seagrass, with the leaf N:P of Xincungang （21.73）>Li′an （14.25）> Wenchang （9.53）≈ Tanmen （10.29）. The fact that leaf N:P had strong correlation with DTN:DIP in seawater has indicated the influence of eutrophication on the imbalance of nutrient uptake in seagrass.

Key words: seagrass, ratio of nitrogen to phosphorus, iron, eutrophication

CLC Number:

Q948

YU Zhi-qin, DENG Hong, WU Ke-wei， DU Jing， MA Min. Nutrient contents of dominant seagrass species and their affecting factors in Hainan Province[J]. Journal of East China Normal University(Natural Sc, 2012, 2012(4): 131-141.

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