Li Xu-Lu, Zhou Yi-Pin, Xia Hua-Yong
South China Sea Marine Engineering Surveying Center, State Oceanic Administration, Guangzhou 510300, China.
Huan Jing Ke Xue. 2013 Mar;34(3):857-63.
Based on the data obtained from monthly cruises from 2000 to 2010, temporal and spatial distributions of the particulate organic matter (POM) in the Mirs Bay were briefly presented and discussed. The POM composition and residence time were approached by combining with the chlorophyll a (Chl-a) measurements. It has been shown that the hydrodynamics in the Mirs Bay only pose a weak impact on the POM distributions. The POM concentration was (1.1 +/- 0.8) mg x L(-1), which was not much different from those in both the Pearl River Estuary and the Daya Bay, but higher than that in the northern South China Sea. A notably positive correlation was found between the POM and Chl-a in the surface-water. The ratio of the phytoplankton POM (PPOM): Chl-a was about 70 g x g(-1), based on which the PPOM concentration was calculated to be (0.31 +/- 0.39) mg x L(-1), accounting for about 28% of the POM. The primary productivity (PP) and integrated POM (IPOM) were used for estimating the POM residence time, which was found to be about 6.5 days in the Mirs Bay, close to that for POC in the coastal continental shelf waters in the southern East China Sea. During the 11-year investigation, the PP inter-annual variability showed a decreasing trend, but both the POM and IPOM underwent a trend of increase, which suggested that the refractory detritus POM had been gradually acumulated in the Mirs Bay.
基于2000年至2010年每月一次巡航所获得的数据，简要介绍并讨论了大鹏湾颗粒有机物（POM）的时空分布。通过结合叶绿素a（Chl-a）测量数据来探讨POM的组成和停留时间。结果表明，大鹏湾的水动力对POM分布的影响较弱。POM浓度为（1.1±0.8）mg·L⁻¹，与珠江口和大亚湾的浓度相差不大，但高于南海北部。在表层水中，POM与Chl-a之间存在显著的正相关关系。浮游植物POM（PPOM）与Chl-a的比值约为70 g·g⁻¹，据此计算出PPOM浓度为（0.31±0.39）mg·L⁻¹，约占POM的28%。利用初级生产力（PP）和综合POM（IPOM）来估算POM的停留时间，发现大鹏湾的POM停留时间约为6.5天，与东海南部沿海大陆架水域的颗粒有机碳（POC）停留时间相近。在11年的调查期间，PP的年际变化呈下降趋势，但POM和IPOM均呈上升趋势，这表明难降解碎屑POM已在大鹏湾逐渐积累。
