三亚湾近3年营养盐含量变化及其输送量的估算   总被引：5，自引：0，他引：5  

王汉奎  董俊德  王友绍  陈国华  张燕英 《热带海洋学报》2005,24(5):90-95

根据2001—2003年监测资料,对三亚湾N、P、Si营养盐含量变化及其输送量进行了研究分析。N、P、Si平均含量分别为1.93、0.10和8.43μmol.L-1,显示出低N和P、高Si的分布状况。夏季N限制出现率仅为10.5%—29.2%,N限制可能性较小;秋季P限制出现率达到66%—79.4%,P限制可能性较大;Si限制出现率为零,Si限制可能性几乎没有。湾外海水营养盐的输送占较高的比例,在2001—2003年的3年时间里,约有670.6t NO2--N、6 174t NO3--N、3 752t NH4+-N、100 800t SiO32--Si和1 246.2t PO43--P从外海向湾内输送,其中,NO3--N的输送量占DIN输送量的60%以上,而SiO32--Si的输送量明显高于N、P输送量。  相似文献   

海燕生殖腺中几种营养成分含量的测定     

郭承华  程岩  刘雪梅  任虹  林忠华 《海洋科学》2004,28(1):79-81

对黄海产海燕(Asterina pectinifera)生殖腺中几种营养成分进行了测定。结果表明,海燕生殖腺中蛋白质含量为43．25％,粗脂肪含量为14．22％,化学元素含量丰富,海燕生殖腺具有开发利用价值。  相似文献   

东海四个赤潮监控区水质状况比较的初步研究     

张丽旭  蒋晓山  马越 《海洋通报》2004,23(4):44-49

根据2002年度赤潮多发期东海岱山、象山港、三都湾和厦门4个赤潮监控区水质监测资料,分析、讨论了各赤潮监控区在赤潮多发期主要水质环境参数、营养盐结构、水质富营养化以及有机污染程度的异同,研究结果表明：在赤潮多发期,4个监控区盐度和pH,DO,COD以及DIP含最差片不大,而NO2-N,NO-N和NH4-N含最差异最显著;营养盐结构分析则表明在赤潮多发期4个监控区NO-N甲均含量占DIN含最的57．4％～94．7％,是监控区无机氮的主要存在形式,也是决定监控区N和P营养盐结构的主要环境因子,各监控区海域浮游植物的限制因子均为P。富营养状态指数和水质指数分析则表明,除三都湾赤潮嗡控区外其他3个监控区水质均呈富营养化状念,目三都湾海域水质属轻度有机污染,而其他三个监控区海域水质均属严重污染。  相似文献   

Multifaceted Role of Microalgae for Municipal Wastewater Treatment: A Futuristic Outlook toward Wastewater Management     

Rahul Kumar Goswami  Komal Agrawal  Pradeep Verma 《洁净——土壤、空气、水》2023,51(3):2100286

Municipal wastewater (MWW) or urban wastewater (UWW) is generated by the domestic consumption of freshwater, which contains a huge amount of nutrients. The release of unprocessed wastewater causes eutrophication and harms aquatic life. Moreover, ingestion of polluted MWW causes a severe negative impact on human health. Microalgae are unicellular, eukaryotic photosynthetic organisms and have the capability of nutrient assimilation in the presence of light. Moreover, the produced biomass can be used for the generation of value-added bioproducts such as bioenergy. However, conventional microalgae-based MWW treatment is not as sustainable on a commercial scale. Therefore, more advanced approaches using microalgae need to be integrated in wastewater cultivation systems to improve nutrient removal efficiency. Thus, the present review explores the use of microalgae for the removal of nutrients from MWW, provides an outlook of direct and indirect methods of nutrient uptake from wastewater and the effects of the influencing factors in biomass growth. Moreover, the review also gives insight into recent approaches used for MWW treatment and the applications of algal biomass resulting from treated wastewater. It is predicted that microalgae-based MWW treatment systems will be a significant green approach to help eliminate nutrient loads and implement circular economy.  相似文献   

外源添加营养对安徽太平湖水库藻类增殖影响的研究     

赵斌 《湖泊科学》1996,8(2):125-132

１９９２年１１月￣１９９３年１０月,在安徽太平湖水库,同时用藻类生长潜力测试法（ＡＧＰ试验）和外源添加营养的黑白瓶测定初级生产力法,对陵山站的水体分季度进行了分析测试。其结果表明,这两种方法对太平湖水库的营养评价均是行之有效的,而且二者的结果也能相互比较、相互验证;太平湖水库的不同季节,其主要营养限制性因子也各异。在枯水期,磷是藻类种群和密度的第一限制性营养元素;丰水期,由于各营养元素都相对缺乏,  相似文献   

用成岩模型计算沉积物-水界面营养盐的交换通量--以渤海为例   总被引：1，自引：0，他引：1  

刘素美  江文胜  张经 《中国海洋大学学报(自然科学版)》2005,35(1):145-151

根据沉积物中营养盐的再生对水体中营养盐的收支循环动力学的作用.利用1998年秋季和1999年春季沉积物间隙水中营养盐的分析结果,建立了沉积物中营养盐的成岩模型,并由此计算了沉积物-水界面营养盐的交换通量.结果表明,硝化速率、反硝化速率、有机氮含量、硅质成分的溶解速率、生物扰动作用、孔隙率明显影响沉积物间隙水中营养盐的分布和沉积物-水界面的交换通量.对比了实验室培养法和扩散通量计算法测得沉积物-水界面营养盐的交换通量,表明2种方法所得NO3通量较一致,但NH4 ,PO43-,SiO32- 2种方法所得通量有一定差异,文中讨论了可能的原因.以渤海为例阐明了在用扩散通量法研究沉积物-水界面营养盐的交换通量时,表层沉积物分割厚度对界面交换通量影响显著,为了得到合理的与现场接近的结果表层沉积物的分割厚度以不超过1em为宜.  相似文献   

基于高光谱的土壤养分含量反演模型研究     

陶培峰  王建华  李志忠  周萍  杨佳佳  高樊琦 《地质与资源》2020,29(1):68-75,84

为实现土壤养分（有机质SOM、全氮TN、全磷TP、全硫TS）含量的快速测定,以建三江创业农场为例,对土壤原始反射率进行了一阶微分（FD）、倒数对数（RL）、倒数一阶微分（FDR）、多元散射校正（MSC）和连续统去除（CR）变换,分析6种光谱变量与土壤养分的相关性,将在α=0.01水平上显著相关的波段作为特征波段,运用多元逐步回归（SMLR）、偏最小二乘回归（PLSR）和BP神经网络（BPNN）三种分析方法分别建立有机质、全氮、全磷和全硫的高光谱预测模型,并利用决定系数（R²）、均方根误差（RMSE）和相对分析误差（RPD）对预测模型进行评价.结果显示,PLSR和BPNN建立的土壤养分含量预测模型均优于SMLR,能极好地预测有机质和全氮含量,同时具有粗略估算全硫含量的能力.三种方法中仅有CR-BPNN能对全磷含量进行粗略估算.对有机质、全氮、全磷和全硫预测效果最佳的模型及其验证集决定系数分别为：MSC-PLSR （0.86）、MSC-PLSR （0.75）、CR-BPNN （0.56）、FDR-BPNN （0.67）.  相似文献   

Groundwater levels,climate and anthropogenic factors affect the hydrology and water quality of an intermittent and a regulated subtropical stream     

Donghwan Kim  Jing Lu  Melanie E. Roberts  David T. Roberts  David N. Orr  David P. Hamilton 《水文研究》2024,38(1):e15074

Stream hydrology and water quality are highly interconnected and impacted by climate, land use and geology. We examined this connection using monitoring data from 2000 to 2019 for two streams with contrasting hydrological regimes—intermittent and regulated perennial—in subtropical Queensland, Australia. Our main objective was to evaluate relationships between groundwater levels, climate and flow regulation on the hydrology and water quality of an intermittent and a regulated subtropical stream. In intermittently flowing Lockyer Creek, flow was highly dependent on groundwater levels and occurred when the aquifer was recharged to elevations exceeding the upper 90-percentile value. With 9.4% of the catchment area in irrigated horticulture, flow in Lockyer Creek was also likely to be reduced by drawdown of the aquifer for irrigation, with no flow for 30% to 81% of days over the observation period for stations in Lockyer Creek. In contrast, flow in the mid-Brisbane River was continuous, regulated by discharge from a large upstream dam. Nutrient and suspended sediment concentrations in Lockyer Creek were generally higher than in the mid-Brisbane River, likely associated with runoff from agricultural areas adjacent to the stream, while the upstream dam likely reduced the concentration and variability of nutrients and suspended sediment in the mid-Brisbane River. During periods of low flow in the mid-Brisbane River, longitudinal changes in nutrient and suspended sediment concentrations occurred, notably a significant decrease in total and dissolved inorganic nitrogen concentrations downstream (p < 0.05), indicating a possible effect of in-stream algal uptake and denitrification. This study highlights the impact of human modifications on stream hydrology and water quality in the face of climate change. The findings can inform decision-making on groundwater irrigation or dam release control for water security.  相似文献   

Assessing impacts of cemeteries on water quality in an urban headwater watershed with mixed human-built infrastructure     

Samuel Nesheim  Zhongjie Yu  Samuel Tuttle  Jenna Klein  Tao Wen 《水文研究》2024,38(3):e15128

Cemeteries are understudied integral components to urban watersheds, which provide ecosystem services but can also export nutrients, trace elements, and other contaminants to nearby water bodies. In this study, we focus on Meadowbrook Creek, an urban headwater stream in Syracuse, New York (USA), which has shown significant nitrate contributions from a local cemetery. We collected biweekly surface water samples over the course of 1 year from 2022 to 2023 for analysis of major and trace elemental concentrations including Na, Ca, Mg, K, F, Cl, sulfate, and nitrate. Here, we aim to assess the impact of various human infrastructures on urban stream water quality with a particular focus on the cemetery and nitrate. A comparison between the new dataset in this study and previously reported water chemistry data in Meadowbrook in 2012 suggests a decade-long impact of road salting and the cemetery on water quality particularly with respect to Na, Cl, and nitrate. Sulfate, Mg, Ca, and K are likely mainly geogenic. Stable nitrogen isotope data, the usage of concrete or steel vaults in the cemetery in the past 50 years, and the lack of correlation between nitrate and fluoride concentrations in stream water argue against burial decay products being a major source of nitrate to the stream. Instead, other nitrate sources that exist in the cemetery such as, fertilizer, decaying plant material, and wastewater, are more viable dominant nitrate sources. In addition, nitrate loading calculations indicate that the groundwater-connected reach, including the cemetery, acts as an annual net sink for nitrate despite the seasonally varying sink-source patterns.  相似文献   

The Irish Sea: Is it eutrophic?     

R.J. Gowen  P. Tett  K. Kennington  D.K. Mills  T.M. Shammon  B.M. Stewart  N. Greenwood  C. Flanagan  M. Devlin  A. Wither 《Estuarine, Coastal and Shelf Science》2008

The question of whether the Irish Sea is eutrophic is addressed by reviewing the evidence for anthropogenic nutrient enrichment, elevated phytoplankton production and biomass and undesirable disturbance in the context of the EU and OSPAR definitions of eutrophication. Winter concentrations of dissolved available inorganic phosphate (DAIP), nitrogen (DAIN as nitrate and nitrite) and silicate (Si) in coastal waters and concentrations of DAIP and Si in offshore waters of the Irish Sea are elevated relative to winter Celtic Sea shelf break concentrations (0.5 μM DAIP, 7.7 μM DAIN and 2.7 μM Si). Significant, negative nutrient salinity relationships and analysis of the Isle of Man nutrient time-series indicate that the elevated Irish Sea levels of DAIP and DAIN are the result of anthropogenic enrichment with highest concentrations (≈2.0 μM DAIP, 30 μM DAIN and 17 μM Si) measured in near shore eastern Irish Sea waters.  相似文献