Abstract：Based on the data obtained from monthly cruises from 2000 to 2012, temporal and spatial distributions of the total dissolved phosphorus (TDP) concentration in the Shenzhen Bay and the coastal southeastern Pearl River Estuary were briefly presented and discussed. Composition and sources of the TDP and transformations between the dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP) were also investigated by combining with measurements of the salinity and DIP. The results showed that the TDP concentration was (0.26±0.22) mg/L in the bay and (0.05±0.02) mg/L in the estuary. The intra- and inter-annual variabilities of the TDP concentration did not change much and were keeping an even trend in the estuary during the study period. The TDP concentration was higher in the low water periods than the high water periods, while increased from 0.24 to 0.33mg/L in the period 2000~2004 and decreased from 0.33 to 0.16mg/L in the period 2005~2012 in the bay under influence of the seaward discharges from the peripheral areas. The TDP in the studied area was nearly conservative and mainly originated from the terrestrial sources. A two-component mixing mass balance model was used for estimating the TDP terrestrial fraction at about 53.9% in the estuary and more than 80% in the bay. The major existing form of TDP shifted gradually from the DIP in the river’s outlets to the DOP in the coastal waters near the open sea, which probably implied that the transformation rate from the DIP to DOP was bigger than the one from the DOP to DIP through the complex biogeochemical processes during the transport of phosphorus from the river’s outlets to the open sea.
张军晓, 李绪录, 肖志建. 深圳湾及邻近水域总溶解磷的来源和时空分布[J]. 中国环境科学, 2015, 35(3): 871-878.
ZHANG Jun-Xiao, LI Xu-Lu, XIAO Zhi-Jian. Temporal and spatial distributions and sources of total dissolved phosphorus in the Shenzhen Bay and adjacent coastal waters. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(3): 871-878.
