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包兰二线铁路某段硫酸盐渍土的盐胀特性及其病害防治 总被引:1,自引:0,他引:1
该路段地表硫酸盐渍土的形成与其地形地貌、气候、工程地质和水文地质条件有关.硫酸钠含量、含水量和温度是产生盐胀的主要因素.防治该段路基盐胀病害,应针对这些条件和因素,综合选用提高路基、设置隔断层、换填垫层、设置地面隔热层或化学处置等方法. 相似文献
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以一个堆放近20年的碳酸盐型尾矿的垂向剖面作为研究对象,采用综合地质-地球化学分析方法,包括尾矿组构及组分分析、X衍射分析以及Sobek-ABA估算和NAG测试等,探讨这类尾矿酸化的地质-地球化学特征及酸化作用机理,获得如下认识:①该尾矿剖面由下至上,随着氧化程度的增强,其酸化作用也逐步增强,呈现出明显的层带结构,即下部C层(还原带及原生带)为未蚀变松散尾砂,中部B层(次氧化带及碱缓冲带)为蚀变松散尾砂层,上部A层(氧化带及酸化带)呈厚约100~150cm的板结硬化层;在A层与B层之间形成一个酸化-碱缓冲界面;而氧化-还原界面则较低,位于B层底部接近C层顶部位置。②碱缓冲作用发生在B层内,方解石为碱质的主要来源。③该尾矿的酸中和有效率约为80%,这可能归因于尾矿酸化所产生的次生纤铁矿、石膏等包裹残余方解石,阻断了中和反应的进行。因此,即便是富含碱性碳酸盐的金属硫化物矿尾矿仍然存在酸化污染的可能性。 相似文献
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嗜酸性氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)能够在低pH值条件下,迅速将Fe2+氧化并产生大量次生羟基硫酸铁沉淀,从而除去水中可溶性Fe2+。这为富含Fe2+的酸性矿山废水(acid mine drainage,AMD)处理提供了新的思路。本文从晶种刺激和阳离子诱导两个方面,分别研究了固定化载体(硅藻土、石英砂)和具有强诱导能力的成矾离子(K+)对微生物转化酸性体系中Fe2+成次生矿物的影响。结果表明,3种材料均有明显促进可溶性Fe2+向次生矿物转化的作用,且总铁(TFe)沉淀率与3种材料的添加量呈正相关关系。在起始Fe2+浓度为160mmol/L,硅藻土、石英砂和钾离子最大添加量分别为10 g、10 g和80 mmol/L时,经过72 h反应后,TFe沉淀率分别比对照增加了8%、24%和20%。矿物中的Fe、K和S元素含量与溶液中的起始K+浓度有非常密切的关系,随着K+浓度的增大,矿物中的K和S含量逐渐增加,而Fe含量则相应减少。 相似文献
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Benoit Lebreton Pierre Richard Robert Galois Gilles Radenac Camille Pfléger Gaël Guillou Françoise Mornet Gérard F. Blanchard 《Estuarine, Coastal and Shelf Science》2011
A current predominant paradigm emphasizes the role of epiphytic algae for invertebrates in most seagrass food webs. However, in some intertidal Zostera noltii beds, epiphyte biomass is very low compared to microphytobenthos and seagrass biomasses. We assessed the role of microphytobenthos in a temperate intertidal Z. noltii bed by combining stable isotope and fatty acid (FA) analyses on primary producers, composite sources — suspended particulate organic matter (SPOM) and sediment surface organic matter (SSOM) — and the main macrofaunal consumers. Z. noltii showed high δ13C (−9.9‰) and high 18:2(n-6) and 18:3(n-3) contents. Microphytobenthos was slightly more 13C-depleted (−15.4‰) and had high levels of diatom markers: 14:0, 16:1(n-7)c, 20:5(n-3). Low mean δ13C (−22.0‰) and large amounts of diatom and bacteria (18:1(n-7)c) markers indicated that SPOM was mainly composed of a mixture of fresh and decayed pelagic diatoms. Higher mean δ13C (−17.9‰) and high amounts of diatom FAs were found in SSOM, showing that microphytobenthic diatoms dominate. Very low percentages of 18:2(n-6) and 18:3(n-3) in consumers indicated a low contribution of Z. noltii material to their diets. Grazers, deposit and suspension-deposit feeders had δ13C close to microphytobenthos and high levels of diatom FAs, confirming that microphytobenthos represented the main part of their diet. Lower δ13C and higher amounts of flagellate FAs – 22:6(n-3) and 16:4(n-3) – in suspension feeders indicated that their diet resulted from a mixture of SPOM and microphytobenthos. These results demonstrate that invertebrates do not consume high amounts of seagrass and highlight the main role of benthic diatoms in this intertidal seagrass bed. 相似文献
998.
Jill Peloquin Julie HallKarl Safi Walker O. Smith Jr.Simon Wright Rick van den Enden 《Deep Sea Research Part II: Topical Studies in Oceanography》2011,58(6):808-823
Areas of high nutrients and low chlorophyll a comprise nearly a third of the world’s oceans, including the equatorial Pacific, the Southern Ocean and the Sub-Arctic Pacific. The SOLAS Sea-Air Gas Exchange (SAGE) experiment was conducted in late summer, 2004, off the east coast of the South Island of New Zealand. The objective was to assess the response of phytoplankton in waters with low iron and silicic acid concentrations to iron enrichment. We monitored the quantum yield of photochemistry (Fv/Fm) with pulse amplitude modulated fluorometry, chlorophyll a, primary productivity, and taxonomic composition. Measurements of Fv/Fm indicated that the phytoplankton within the amended patch were relieved from iron stress (Fv/Fm approached 0.65). Although there was no significant difference between IN and OUT stations at points during the experiment, the eventual enhancement in chlorophyll a and primary productivity was twofold by the end of the 15-day patch occupation. However, no change in particulate carbon or nitrogen pools was detected. Enhancement in primary productivity and chlorophyll a were approximately equal for all phytoplankton size classes, resulting in a stable phytoplankton size distribution. Initial seed stocks of diatoms were extremely low, <1% of the assemblage based on HPLC pigment analysis, and did not respond to iron enrichment. The most dominant groups before and after iron enrichment were type 8 haptophytes and prasinophytes that were associated with ∼75% of chlorophyll a. Twofold enhancement of biomass estimated by flow cytometry was detected only in eukaryotic picoplankton, likely prasinophytes, type 8 haptophytes and/or pelagophytes. These results suggest that factors other than iron, such as silicic acid, light or physical disturbance limited the phytoplankton assemblage during the SAGE experiment. Furthermore, these results suggest that additional iron supply to the Sub-Antarctic under similar seasonal conditions and seed stock will most likely favor phytoplankton <2 ??m. This implies that any iron-mediated gain of fixed carbon will most likely be remineralized in shallow water rather than sink and be sequestered in the deep ocean. 相似文献
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