搜索结果: 1-14 共查到“理学 DOM”相关记录14条 . 查询时间(0.14 秒)
东北地理所在冻土区湖泊DOM组分研究中取得新进展（图）
溶解性有机物 地球化学 循环
2024/4/28
溶解性有机物（DOM）在生物地球化学循环中起着重要作用。随着全球气候持续变暖，湖泊中DOM组分发生了明显变化，这可能会对生态环境，尤其是多年冻土区碳循环，产生较大的影响。
中国科学院生态环境研究中心魏源送研究组基于高分辨质谱和数据挖掘方法揭示了污泥厌氧发酵过程溶解性有机物的反应特性，相关成果近期发表在Water Research （2023, 229, 119488）。
陆地生态系统每年承接、储存及输移的碳通量可达51亿吨，尽管内陆水域只覆盖了地球两极冰盖除外陆域面积的3.7%，其转移、转化的碳通量却十分巨大。溶解性有机物（DOM）主要成分为碳，是天然水体中有机质最重要的赋存形态及活跃成分，其来源组成能影响水处理工艺与流程、重金属及有毒有害物迁移、毒性及生物有效性。DOM矿化也能释放大量有机及无机营养盐，从而影响湖泊富营养化进程及生态系统健康。溪流源头等系统中DO...
DOM AND DEM SYNCHRONIZATION EDITIONG AND UPDATING METHOD BASED ON GEOMORPHOLOGICAL CHANGE DETECTION
DOM DEM Geomorphological Change Detection Synchronization Editing Updating Method
2018/5/11
Aiming at the deficiency of the existing DOM and DEM production modes and the networking and automation requirements of the information mapping production system, a method of network-based simultaneou...
红树植物对根际微生物群落产生影响，应与其根区微域中的溶解性有机物（ｄｉｓｓｏｌｖｅｄ ｏｒｇａｎｉｃ ｍａｔｔｅｒ，简称 ＤＯＭ）密切相关．采用总有机碳
（ＴＯＣ）分析仪和三维荧光分析法对 ５ 种主要红树植物建群种的 ＤＯＭ 浓度和组分进行原位采样与测定．根际土和非根际土孔隙水 ＤＯＣ 的总平
均值分别为 ２０７．８７ ｍｇ·Ｌ
－１
、１４４．５１ ｍｇ·Ｌ
－１
．从三维荧光光谱图...
Dom João de Castro is an isolated seamount located in the Azores archipelago (Northeast Atlantic), between the islands Terceira and São Miguel. The shallower parts of this seamount were form...
溶解有机物(DOM)对痕量金属的形态、生物可利用性及其最终归属都有着很大的影响. 由于腐殖质(HS)是DOM的最大组成部分, 占溶解有机碳比重的40％-70％, 而HS是由芳香族、酚族、 醌族和杂环的结构单元无规则缩合连接成的大分子. 这种多官能团的结构使得HS与痕量金属有着很强的络合能力, 从而增加了天然水体中的金属浓度. 本文利用此技术首次获得了11种元素在海水水体中DOM上不同分子量的天然分...
以垃圾渗滤液为水溶性有机质(DOM)提取原料,通过与吸附载体蒙脱石的有机-无机复合制得蒙脱石/DOM复合体,研究其对菲的吸附作用以及温度、pH值、固液比等不同因素对吸附过程的影响.结果表明,相比蒙脱石原土,蒙脱石/DOM复合体对菲的吸附能力得到显著提高;随着温度升高吸附量呈下降趋势;介质pH值对吸附影响不大;随着固液比的增大,平均吸附量逐渐减小,吸附率逐渐增大.动力学研究表明,菲在蒙脱石/DOM复...
激光诱导水体中DOM的荧光猝灭特性分析
激光诱导荧光(LIF) 溶解有机物(DOM) 荧光猝灭
2009/10/29
以355 nm激光为激发光源，在实验室中用激光诱导荧光(LIF)方法以不同浓度的腐殖酸为测量样品研究了水体中溶解有机物(DOM)的荧光猝灭特性。研究表明，随着腐殖酸浓度的增加，水拉曼散射强度逐渐减弱，当浓度为40 mg·L-1时，水拉曼散射信号几乎完全被DOM的荧光基态分子所吸收，而DOM的荧光强度随着浓度的增加，先是线性增加，当浓度为16 mg·L-1时，荧光强度达到最大，再继续增加腐殖酸浓度，...
Assessing the dynamics of dissolved organic matter (DOM) in coastal environments by excitation emission matrix fluorescence and parallel factor analysis (EEM-PARAFAC)
Assessing the dynamics dissolved organic matter
2014/4/21
The distributions of fluorescent components in dissolved organic matter (DOM) from Ise Bay, Japan, were
determined by excitation emission matrix (EEM) fluorescence spectroscopy combined with parallel...
Tracing13 C-enriched dissolved and particulate organic carbon in the bacteriacontaining coral reef spongeHalisarca caerulea: Evidence for DOM feeding
Tracing13 C-enriched dissolved particulate organic carbon bacteriacontaining coral reef spongeHalisarca caerulea =DOM feeding
2014/4/18
Here we report on the trophodynamics of the bacteria-containing coral reef sponge Halisarca caerulea. The assimilation and respiration of the13 C-enriched substrates glucose, algal-derived dissolved a...
Uptake of dissolved organic matter (DOM) and its importance to metabolic requirements of the zebra mussel, Dreissena polymorpha
dissolved organic matter metabolic requirements zebra mussel Dreissena polymorpha
2014/5/8
We determined the rates at which Dreissena polymorpha assimilated radiolabeled acetate, monosaccharides, amino acids, and fatty acids at environmental concentration levels. The mussels incorporated al...
Phototransformation of riverine dissolved organic matter (DOM) in the presence of abundant iron: Effect on DOM bioavailability
Phototransformation riverine dissolved organic matter abundant iron DOM bioavailability
2014/5/14
We conducted studies with high-molecular-weight (HMW) and low-molecular-weight (LMW), hydrophobic, and hydrophilic dissolved organic matter (DOM) from an oligotrophic alpine river, the Tagliamento Riv...
Spatial and diurnal dynamics of dissolved organic matter (DOM) fluorescence and H2O2 and the photochemical oxygen demand of surface water DOM across the subtropical Atlantic Ocean
Spatial and diurnal dynamics dissolved organic matter DOM fluorescence and H2O2 photochemical oxygen demand surface water DOM across subtropical Atlantic Ocean
2014/6/9
Diurnal dynamics of dissolved organic matter (DOM) fluorescence and hydrogen peroxide (H2O2) concentrations were followed in the upper 100 m of the water column at five stations across the subtropical...