福建省近岸港湾沉积物质量状况

福建省是我国东南沿海省份,地处台湾海峡西岸.位于23°37'～27°10'N,117°11'～120°26'E之间.海域面积为13.6×104km2.其陆岸线总长为3324km.呈东北至西南走向,海岸线曲折多弯,形成了许多天然良港.其港湾沿岸均是福建沿海地区社会经济水平较高地区,是海洋资源开发的龙头产业所在地.近年来,随着改革开放,福建省经济突飞猛进,港口建设、海水养殖等经济迅速发展,港湾的沉积物污染状况日趋变得突出.     

Simultaneous Measurement of Hydrogen Peroxide and Fe Species (Fe(II) and Fe<Subscript>(tot)</Subscript>) in Okinawa Island Seawater: Impacts of Red Soil Pollution

The northern part of Okinawa Island suffers from red soil pollution—runoff of red soil into coastal seawater—which damages coastal ecosystems and scenery. To elucidate the impacts of red soil pollution on the oxidizing power of seawater, hydrogen peroxide (HOOH) and iron species including Fe(II) and total iron (Fe_(tot), defined as the sum of Fe(II) and Fe(III)) were measured simultaneously in seawater from Taira Bay (red-soil-polluted sea) and Sesoko Island (unpolluted sea), off the northern part of Okinawa Island, Japan. We performed simultaneous measurements of HOOH and Fe(II) because the reaction between HOOH and Fe(II) forms hydroxyl radical (•OH), the most potent environmental oxidant. Gas-phase HOOH concentrations were also measured to better understand the sources of HOOH in seawater. Both HOOH and Fe(II) in seawater showed a clear diurnal variation, i.e. higher in the daytime and lower at night, while Fe_(tot) concentrations were relatively constant throughout the sampling period. Fe(II) and Fe_(tot) concentrations were approximately 58% and 19% higher in red-soil-polluted seawater than in unpolluted seawater. Gas-phase HOOH and seawater HOOH concentrations were comparable at both sampling sites, ranging from 1.4 to 5.4 ppbv in air and 30 to 160 nM in seawater. Since Fe(II) concentrations were higher in red-soil-polluted seawater while concentrations of HOOH were similar, •OH would form faster in red-soil-polluted seawater than in unpolluted seawater. Since the major scavenger of •OH, Br⁻, is expected to have similar concentrations at both sites, red-soil-polluted seawater is expected to have higher steady-state •OH concentrations.     

Possible effects of climate change on estuarine nutrient fluxes: a case study in the highly nutrified Schelde estuary (Belgium, The Netherlands)

Global change models predict effects of climate change on hydrological regimes at the continental scale in Europe. The aim of this study was to gain a better understanding of the possible effect of changing external forcing conditions on the functioning of estuarine ecosystems. In densely populated areas, anthropogenic nutrient enrichment and consequent alteration of nutrient biogeochemical cycles have already had a big impact on these ecosystems. The average yearly discharge of the upper Schelde estuary increased nearly threefold over the period 1996–2000, from 28 m³ s⁻¹ in 1996 to 73 m³ s⁻¹ in 2000. The continuously rising discharge conditions over the five-year period were used as a reference situation for possible future effects of climate on ecological functioning through increase of discharge. At high discharges, nutrient (NH₄⁺, NO₃⁻, dissolved silica and PO₄³⁻) concentrations in the tidal fresh- and brackish water showed a decrease of up to 50% while total discharged nutrient loadings increased up to 100%. Opposite effects of increasing discharge on NH₄⁺, NO₃⁻ and dissolved silica concentrations in summer and winter, resulted in the flattening out of seasonal cycles for these nutrients. Under high discharge conditions, silica uptake by diatom communities was lowered. Dissolved silica loadings to the coastal area increased concurrently with total silica loadings upstream. Salt intrusion to the marine parts of the estuary decreased. This resulted in a downstream shift of the salinity gradient, with lower salinity observed near the mouth. As a result, TDIN, NO₃⁻ and dissolved silica concentrations doubled at the mouth of the estuary.     

SZ36-1油田海域水质和沉积物的现状及评价

本文分析了SZ36-1油田附近海域的水质和底质调查资料,描述并评价了13个水质要素和7个沉积物要素的分布规律。本海域各要素的含量分布比较均匀;重金属的含量比较低,石油是本海域海水中主要超标物质。按一类海水标准衡量,本海域东半部水质属轻污染,其余属“尚清洁水平”。     

虾塘养殖中有机质自身污染速率及程度的研究

利用养殖期间水体中颗粒有机质垂直迁移通量，测定了虾塘自污速率；并以虾塘沉积物的Ｅｈ和Ｃｏｍ值为指标，结合其空间分布形式，初步探讨了虾塘中有机质污染程度。结果表明，新、旧虾塘尤其是不同养殖区域间的自污速率都存在明显差别；而沉积物中Ｅｈ和Ｃｏｍ值的垂直分布形式，则可能成为虾塘有机质污染程度的重要评估参数。     

九龙江口及邻近港湾红树林区沉积物中多环芳烃污染现状及评价

本文应用沉积物质量评价基准法对九龙江口及邻近港湾红树林区表层沉积物中多环芳烃的污染现状进行了生态风险评价,并定量分析了多环芳烃的相对污染强度.研究结果表明:各测站区多环芳烃相对污染系数均小于1,范围为0.022~0.620,污染程度尚属较低,引起生物毒性效应的几率相对较小.低分子量多环芳烃芴、萘和二氢苊占总相对污染系数比例较高(平均分别为18.1%、16.7%和15.3%),因而具有相对较高的潜在生态危害风险.     

青岛奥运海域污染物浓度预测及污染控制对策研究

在已建二维潮流数值模型的基础上,利用物质输运方程模拟了奥运海域主要污染物的浓度分布。结果表明,奥运海域水质整体良好,但是无机氮对奥运水质的影响比COD、活性磷酸盐大,是奥运海域的隐患。为了保持奥运海域良好的水质,本文给出了一系列的污染控制对策,为环境管理者提供了一定的科学依据和建议。     

Resting stages of Tortanus forcipatus (Crustacea, Calanoida) in sediments of Victoria Harbor, Hong Kong

The distribution and abundance of viable and non-viable (so-called resting eggs) embryos of the calanoid copepod Tortanus forcipatus were determined in the laboratory by the enumeration of nauplii that emerge from sediments collected in Victoria Harbor (Hong Kong). Sediment cores sliced down to a depth of 37 cm showed the highest number of viable resting eggs near the surface layer (0–5 cm). The number of viable eggs sharply decreased with sediment depth, particularly at the inner harbor stations, although diapause eggs remained viable as deep as 25 cm. ²¹⁰Pb analyses of the sediments indicated that the mean egg age was 4.9 years. The egg mortality of T. forcipatus in the sediments was 0.135 year⁻¹, or 78.22% annual egg survival, calculated by regressing ln (egg density) from sediment age. The range of horizontal distribution of viable resting eggs was 24.25 × 10³–58.90 × 10³ m⁻², with a mean value of 36.8 × 10³ m⁻² over all stations. The accumulation of viable resting eggs that can persist for an extended period of time provided evidence for the existence of an egg bank of T. forcipatus in the sediments of Victoria Harbor.     

蒲城水库水质污染与富营养化评价和预测的研究

本文对蒲城水库污染负荷量进行了动态平衡研究,开展了物理、化、学、放射性、水生生物和富营养化等多项指标的监测分析,采用多种方法对水库水质污染现状与富营养化程度作出了综合评价和中、长期预测,提出了水质保护对策。研究结果表明:30年后蒲城水库水质除pH、总锰等个别项目可能超标外,其它水质指标均符合地面水三类标准;总氮、总磷浓度各低于0.40mg/L和0.03mg/L,水库仍将处于中—富营养型。但10年后的夏季总氮、总磷浓度将会分别超过0.50mg/L和0.35mg/L,存在富营养化的危险。