共查询到19条相似文献，搜索用时 152 毫秒
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１引言 由于高效液相色谱法（ＨＰＬＣ）的建立,利用光合色素,尤其是类胡萝卜素作为区分浮游植物类群的指示物,成为更方便和有效的化学分类法［１,２］．原因是色素能够很好地进行定量,可涵盖浮游植物的全部粒级范围;而且,适用于大批量样品的分析,甚至可实现现场的船上测定．海洋浮游植物光合色素的研究,比较多地集中在开放大洋,多为利用类胡萝卜素表征浮游植物的类群结构［３－５］;或以光合色素及其降解产物作为浮游植物参与的生物地球化学过程的生物标志物［６－８］．相比较而言,在近岸、陆架海域开展的此类研究较少,且多… 相似文献
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一种海洋浮游植物定量研究分析方法—Utermoehl方法的介绍及其改进 总被引：20，自引：0，他引：20
对国际上通用的浮游植物定量生物学基础研究方法－Utermoehl方法的应用进行了介绍，并对此方法的不足之处和误差来源进行了分析，在此基础上，对误差的统计方法提出进一步改进，同时，指出了我国现有海洋调查中浮游植物定量研究方法的不足之处，建议以Utermoehl方法替代网采方法作为今后中国海洋浮游植物定量学研究的基本手段。 相似文献
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浮游植物因巨大的“蓝碳”潜力，有助于国家实现“碳达峰”、“碳中和”目标，是碳计量的重要研究对象。浮游植物种类繁多，细胞结构、形态、丰度差异大，与之关联的分类鉴定工作一直是学界研究重点及难点。高通量基因测序、微流控、高灵敏度等新型生物检测技术的研发是适应海洋浮游植物分类和快速监测需求的。通过综合分析浮游植物鉴定与监测的经典技术方法、快速鉴定与监测技术的发展动态和研究应用进展，并使用VOSviewer对浮游植物的自动监测相关文献进行计量分析，以期为浮游植物分类及生态等相关研究人员拓展研究思路、提升研究效率提供帮助。 相似文献
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《海洋湖沼通报》2016,(2)
东平湖是南水北调东线关键调蓄湖,其水质状况直接影响调水水质安全。考虑到冬季是调水的主要季节,课题组特于2011年12月份采集了东平湖33个点的水样,测定了营养盐的浓度以及主要水化学指标,以了解东平湖水体营养盐的污染特征和水质状况。研究表明,东平湖TN、TP平均含量分别为0~3.7mg/L、0.009~0.269mg/L,无机氮的含量大小依次为NO_3~--NNH_4~+-NNO_2~--N;东平湖湖泊的矿化度等水化学指标浓度存在一定差异,主要离子是Mg~(2+)-Ca~(2+)-Na~+-SO_4~(2+)-Cl~--HCO_3~-,水型为硫酸盐类-镁组-II型水;根据单因子法水质评价结果,东平湖水质情况已不容乐观,33处样点中有10个水质属于劣V类,7个样点的水质属于V类,主要是因为TN、TP含量超标,因此为了确保调水水质安全,需进一步加大区域及东平湖水质治理力度。 相似文献
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类脂生物标志物重建近150年来东海陆架区DH5-1站位浮游植物生态结构及陆源输入的变化 总被引：2，自引：0，他引：2
类脂生物标志物法已被广泛应用于古海洋环境研究,但是在东海利用类脂生物标志物法重建浮游植物生产力、群落结构以及陆源输入的研究还很缺乏。本文选取东海陆架区的DH5-1岩芯进行类脂生物标志物分析,利用各种类脂生物标志物的沉积通量及相对比例重建了东海陆架区近150a来浮游植物生产力和群落结构以及陆源输入的变化。结果表明:(1)DH5-1站位的浮游植物生产力在过去80年呈上升趋势,群落结构在过去近百年有甲藻比例升高,硅藻比例降低的趋势,而颗石藻比例在低值范围波动;(2)用于指示生活污水污染的两种指标(粪醇含量,粪醇/(粪醇+二氢胆固醇)比值)的值都很低,表明近150a来此站位基本未受人类生活污水污染;(3)陆源高等植物输入在1970年前是增加的,1970年后输入减少,陆源有机质指标TMBR指示近150a来陆源输入相对海源是减少的。DH5-1站位生产力的提高可能与长江冲淡水营养盐的增加和东亚冬季风的增强有关,群落结构的改变可能与近年来冲淡水的Si/N降低有关,研究区域40年来陆源有机质相对比例的减少主要与人类建坝活动增强有关。 相似文献
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南四湖,东平湖资源综合开发问题探讨 总被引：1，自引：0，他引：1
南四湖，东平湖是华北重要的淡水湖，湖区自然条件优越，资源丰富，有巨大开发潜力。本文分析湖区资源特征，开发利用现状和存在问题，提出合理开发利用途径与对策。 相似文献
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基于南四湖湖区2006～2016年的水质监测数据,选取CODcr、TP、TN、和NH_3-N作为水质评价指标,对南四湖各湖区的污染情况及年际变化趋势进行对比分析,并利用综合水质标识指数法,对南四湖水质变化年际趋势进行综合评价。结果表明:2006～2016年间,各监控站点CODcr、TP、TN和NH_3-N浓度的年平均值总体呈下降趋势,其中NH_3-N的浓度平均值下降率最大,为72%。2016年南阳湖、独山湖、昭阳湖、微山湖的综合水质指标分别为4.096、3.446、3.350、3.128,呈现出北高南低的空间分布特征。2006～2016年间南四湖的综合水质标识指数由4.620下降至3.350,整体提高了1～2个水质类别,水质得到一定改善。由此可见,加强湖泊区域实施"治"、"用"、"保"并举等流域综合治理措施对湖区的治污效果意义重大。 相似文献
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Intermittently closed and open lakes and lagoons (ICOLLs) are shallow barrier lakes which are intermittently connected to the sea and experience saline intrusions. Many ICOLLs are mechanically opened to prevent flooding of surrounding agricultural and urban land and to flush water of poor quality. In this study, the effects of modified opening regimes (frequency and duration of barrier openings and closures) on water quality and phytoplankton in two New Zealand ICOLLs were investigated over a number of opening/closure cycles. Water quality in Lake Ellesmere (Te Waihora) responded weakly to both opening and closing events, indicating that sea–ICOLL exchange did not markedly improve water quality. Conversely, water quality in Waituna Lagoon responded rapidly to barrier openings; water level decreased to near sea level within days of opening and subsequent seawater exchange resulted in rapid decreases in nitrate and chlorophyll a concentrations. The closure of Waituna Lagoon resulted in rapid rise in water level and a pulse of nitrate and phosphorus in the water column and phytoplankton chlorophyll a concentrations increased with increasing closed-period duration. Based on data on the underwater light climate and nutrient dynamics, phytoplankton in Lake Ellesmere was probably light-limited, whereas phytoplankton in Waituna Lagoon was rarely light-limited, and appeared to be predominately P-limited. The marked differences in responses of Lake Ellesmere and Waituna Lagoon to barrier openings and closures reflected differences in ICOLL water levels and morphological characteristics, which dictated the degree of tidal flushing when the barriers were open. The inter-ICOLL differences observed in this study indicate that unless the effects of ICOLL openings/closures on phytoplankton and nutrient dynamics are understood, changes to ICOLL opening regimes may have unintended consequences for the water quality and ecology of these systems. 相似文献
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星湖水动力条件及水质模型的研究I.水动力条件与水环境质量调查 总被引：1，自引：1，他引：1
对广东省肇庆市星湖水位、水量平衡、入湖污染源和水质现状进行了 近2年的实测调查，并结合历史资料，分析了星湖水动力特征、水质现状特征和水质变化趋 势。结果表明：星湖水源补给主要是北岭山汇集的雨水和湖面降雨；湖水位主要受人工调节 及降雨的影响，常年变幅不大；湖泊交换系数为1.17；生活污水是主要的污染源，主要的水 环境问题是有机污染和富营养化；最近几年来，总体水质状况变化不大。针对以上 特点，提出了几条治理建议。 相似文献
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《Marine Chemistry》1991,32(2-4)
The occurrence of hypoxia in October 1988 in the Krka estuary is described, with special reference to the Prokljan Lake. Hypoxia develops near the bottom in autumn in response to the temperature maximum that appears this time of the year. The decomposition rate of naturally present organic matter increases, creating higher biological oxygen demand. As the water column is stratified by salinity and temperature, mixing of seawater near the bottom with oxygen-supersaturated water which resides closer to the surface is very slow. When an extensive marine phytoplankton bloom appears below the halocline in the Prokljan Lake, then, because of the sinking and degradation of phytoplankton near the bottom, the dissolved oxygen concentration decreases further. The hypoxia becomes so severe that it causes massive mortality of benthic macrofauna. The decomposition of the macrofauna further decreases the dissolved oxygen concentration. The hypoxia may persist until an increase in the freshwater inflow occurs, which forces the arrival of colder marine water near the bottom via a compensating flow. In the absence of autumn rains, the hypoxia may be recorded throughout winter. 相似文献
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本文通过现场考察及水质监测,评价了乌伦古湖的水质及污染源状况,还对水质的发展趋势进行了初步预测。本文认为,湖区面污染源相对严重,湖体内有78.8％的水面是以有机污染为主的轻污染水域。到本世纪末,该湖污染负荷量将有较大的增长。因此,必须保持充足的湖水贮量,严格控制入湖污染负荷。 相似文献
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Surface and bottom water samples were collected from 39 widely spaced stations in Lake Rotorua in February 1967 and from 12 stations in Lake Rotoiti in March 1967. In Lake Rotorua, data obtained from these samples showed that small horizontal differences existed between the southern and northern parts of the lake probably related to the higher inflow of plant nutrients at the southern end and to the prevailing southerly wind concentrating phytoplankton populations at the northern end. Lake Rotoiti, which differed from Lake Rotorua in being thermally stratified, showed no important horizontal differences, Vigorous mixing in the strata probably being accomplished by deep seiches except in the shallow western basin of the lake, where the inflow from Lake Rotorua occurs. Serial vertical hauls for a zooplankton survey of Lake Rotoiti were taken from three stations in March 1967. The distribution of zooplankton was complex because diurnal vertical migrations of the animals were combined with horizontal movement of the water layers. 相似文献