中文摘要：

依据2000—2012年每月1次的调查资料,简要描述和讨论了深圳湾及邻近沿岸水域中溶解无机磷（DIP）质量浓度的时空分布,并结合盐度（S）和溶解无机氮实测数据探讨DIP的来源和氮：磷（N∶P）原子比.结果表明,深圳湾和珠江口东南沿岸中DIP质量浓度分别为（0.184±0.167）mg·L-1和（0.025±0.013）mg·L-1.在深圳湾,由于受到周边陆源排放的影响,DIP质量浓度在丰水期较低,枯水期较高.在珠江口东南沿岸,由于受到多个环境因子的制约,DIP质量浓度在夏秋季较高,冬春季较低.2000—2012年珠江口东南沿岸DIP质量浓度的年际变化趋势基本上保持平稳;深圳湾DIP质量浓度在2000—2004年呈上升趋势,从0.173 mg·L-1上升至0.236 mg·L-1,2005—2012年则呈下降趋势,从0.221mg·L-1下降至0.120 mg·L-1;2000—2012年深圳湾和珠江口东南沿岸N∶P原子比的年际变化均呈上升趋势,分别从31.8和41.5上升至44.9和60.1.研究海区中的DIP具有＂保守性＂,主要来自陆源排放.依二元混合质量平衡模式估算的珠江口东南沿岸DIP的陆源质量分数约为63.0%,而深圳湾的都〉87%.研究海区中N∶P原子比高达48.3±36.9,暗示磷是初级生产的潜在限制因子.

英文摘要：

Based on the data obtained from monthly cruises from 2000 to 2012,the temporal and spatial distributions of dissolved inorganic phosphorus（ DIP） in the Shenzhen Bay and southeastern Pearl River Estuary were briefly discussed,and the DIP sources and atomic nitrogen /phosphorus（ N/P）ratio were investigated by combining with monitoring data of the salinity（ S） and dissolved inorganic nitrogen. The results showed that the DIP concentration was（ 0.184±0.167） mg·L-1in the bay and（ 0.025±0.013） mg·L-1in the estuary. The DIP concentration was higher in drought periods than that in flood season in the bay,affected by seaward discharges from the peripheral areas. In the estuary,DIP was higher in summer and autumn than in winter and spring due to restriction of many environmental factors. The DIP concentration kept a nearly even trend in the estuary in the period 2000—2012,while increased from 0.173 to 0.236 mg·L-1in the period 2000—2004 and decreased from 0.221 to 0.120 mg·L-1in the period 2005—2012 in the bay. However,the atomic N / P ratio increased from 31.8 to 44.9 in the bay and from 41.5 to 60.1 in the estuary in the period 2000—2012. The DIP 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 DIP terrestrial fraction at about 63.0% in the estuary and more than 87% in the bay. The atomic N / P ratio was as high as 48.3± 36. 9,implying that the primary production was potentially phosphorus-limited in the studied area.