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同沙水库夏季浮游植物群落结构特征及影响因子分析 被引量:1
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作者 曾晨军 黄本胜 +5 位作者 刘树锋 李虎成 崔静思 吴蕴怡 杨凌玲 卢敏萍 《广东水利水电》 2023年第4期71-76,共6页
为评估同沙水库水生态状况,于2021年8月在同沙水库开展了浮游植物样品的采集和水质状况的调查。依据Shannon-Wiener多样性指数(H')、Pielou均匀度指数(J)和浮游植物密度对水质和水体营养状态进行评价,采用Spearman相关性分析浮游植... 为评估同沙水库水生态状况,于2021年8月在同沙水库开展了浮游植物样品的采集和水质状况的调查。依据Shannon-Wiener多样性指数(H')、Pielou均匀度指数(J)和浮游植物密度对水质和水体营养状态进行评价,采用Spearman相关性分析浮游植物与环境因子间的关系。结果表明:本次采样调查共鉴定出浮游植物6门48种,绿藻门种类数最多,占47.9%,蓝藻门次之(27.1%),优势种以蓝藻门微小平裂藻(Merismopedia tenuissima)、点形平裂藻(Merismopedia punctata)、微囊藻(Microcystis)为主,蓝藻门浮游植物密度、生物量均高于绿藻门。夏季同沙水库各采样点水质类型均为清洁—寡污染型,水体营养状态为富营养型,pH和NH_(4)^(+)-N是影响同沙水库浮游植物群落结构的主要环境因子。 展开更多
关键词 同沙水库 浮游植物 群落结构 多样性指数 环境因子
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同沙跨湖大桥静动力载荷试验分析 被引量:1
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作者 徐凯燕 刘灿 《四川建筑科学研究》 2012年第6期81-83,共3页
以连续钢箱梁弯桥——同沙跨湖大桥为研究对象,进行了全桥静、动力载荷试验,对梁的整体挠度、梁截面应变等试验数据进行了详细分析。结果表明:在静力荷载作用下,该桥试验跨的刚度与强度均满足公路-Ⅱ级的设计要求;动载试验所得到的桥梁... 以连续钢箱梁弯桥——同沙跨湖大桥为研究对象,进行了全桥静、动力载荷试验,对梁的整体挠度、梁截面应变等试验数据进行了详细分析。结果表明:在静力荷载作用下,该桥试验跨的刚度与强度均满足公路-Ⅱ级的设计要求;动载试验所得到的桥梁第一阶竖向振动的固有频率大于理论计算值,桥梁实际刚度大于设计值;其他指标也满足公路-Ⅱ级的设计要求,技术状态良好。 展开更多
关键词 同沙跨湖大桥 静动力载荷试验 分析
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珠江三角洲同沙水库全氟辛酸和全氟辛烷磺酸污染现状调查 被引量:6
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作者 张佳骥 薛晓燕 +5 位作者 黄楚珊 陈绵彪 张丽娟 任明忠 胡国成 刘珊 《环境化学》 CAS CSCD 北大核心 2017年第12期2600-2608,共9页
利用高效液相色谱与质谱联用技术(HPLC-MS/MS)对珠江三角洲同沙水库19个表层水样中PFOA和PFOS含量水平进行了分析,阐述了两种化合物在同沙水库中的污染现状.同沙水库表层水体中PFOA和PFOS浓度范围分别为2.15—26.70 ng·L^(-1)和nd... 利用高效液相色谱与质谱联用技术(HPLC-MS/MS)对珠江三角洲同沙水库19个表层水样中PFOA和PFOS含量水平进行了分析,阐述了两种化合物在同沙水库中的污染现状.同沙水库表层水体中PFOA和PFOS浓度范围分别为2.15—26.70 ng·L^(-1)和nd—44.85 ng·L^(-1),其中库区中两种化合物的平均浓度要略高于入库支流.入库支流中PFOA和PFOS相对百分含量与库区相比,波动幅度较大,说明入库支流受到工业活动影响更明显.水库中一些点位PFOA和PFOS含量较为突出,其原因可能与周围的各种工业活动以及所处的特殊地理位置等因素有关.与国内外其他地区水体相比,同沙水库中PFOA和PFOS含量水平在国内处于较高水平,而在国际上处于相对较低的水平. 展开更多
关键词 全氟辛酸 全氟辛烷磺酸 污染现状 同沙水库 珠江三角洲
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同沙生态公园鸟类资源及其保护
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作者 佟富春 《山东林业科技》 2008年第1期46-49,共4页
对同沙生态公园鸟类组成、鸟类区系、鸟类物种多样性和资源鸟类进行了研究。结果表明:该公园有鸟类45种,隶属6目,20科。在该公园内分布的45种鸟类中,属留鸟的有25种,属冬候鸟的有18种,属夏候鸟的有2种。根据中国动物区系的划分,公园内... 对同沙生态公园鸟类组成、鸟类区系、鸟类物种多样性和资源鸟类进行了研究。结果表明:该公园有鸟类45种,隶属6目,20科。在该公园内分布的45种鸟类中,属留鸟的有25种,属冬候鸟的有18种,属夏候鸟的有2种。根据中国动物区系的划分,公园内的鸟类属东洋界物种的有22种。属古北界物种的有13种,属广布种的有10种。 展开更多
关键词 鸟类资源 鸟类保护 区系特征 同沙生态公园
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同沙水库水环境容量分析 被引量:3
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作者 韩娇 《河南科技》 2013年第4期180-181,共2页
基于同沙水库南部进水、北部出水两个主要监测断面水质监测分析了同沙水库的水质现状及入库污染负荷现状。选择质量平衡方程作为水环境容量的计算模型,以CODCr、TN、TP、NH3-N为控制因子,计算了同沙水库地表水Ⅲ水质保护目标下的水环境... 基于同沙水库南部进水、北部出水两个主要监测断面水质监测分析了同沙水库的水质现状及入库污染负荷现状。选择质量平衡方程作为水环境容量的计算模型,以CODCr、TN、TP、NH3-N为控制因子,计算了同沙水库地表水Ⅲ水质保护目标下的水环境容量。结果显示同沙水库污染严重,水环境容量超出水库自净能力CODCr4007t/a、TN2098t/a、TP51.9t/a、NH3-N1036t/a。 展开更多
关键词 同沙水库 水环境容量 水质 水质模型
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同沙水库雨水径流污染控制工程方案研究
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作者 白璐 宋乾武 +3 位作者 许春莲 秦琦 李志 王红雨 《环境工程》 CAS CSCD 北大核心 2011年第2期61-64,共4页
为了尽快恢复作为备用水源的同沙水库的水质,防止初期雨水径流污染。根据流域面积、用地性质、降雨量,结合相关研究成果,对雨水径流的水量水质进行估算,从而确定雨水径流污染控制工程的处理规模;根据工程用地情况,提出雨水径流污染的拦... 为了尽快恢复作为备用水源的同沙水库的水质,防止初期雨水径流污染。根据流域面积、用地性质、降雨量,结合相关研究成果,对雨水径流的水量水质进行估算,从而确定雨水径流污染控制工程的处理规模;根据工程用地情况,提出雨水径流污染的拦截、分流、调蓄、处理的技术方案,设计出水水质达到地表IV类水体。为治理同沙水库雨水径流污染提供工程方案。 展开更多
关键词 同沙水库 雨水径流 污染控制
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同沙水库水质净化工艺探讨
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作者 詹健钧 《河南水利与南水北调》 2021年第1期20-22,共3页
水库通常作为当地的备用水源地使用,其水质问题一直信受社会关注。文章以广东省东莞市同沙水库为例,通过其水库概况,库区水质存在的问题,对其水质净化采用的工艺进行阐述,介绍了其水质净化工程完成后所带来实际效果。可为类似水库水质... 水库通常作为当地的备用水源地使用,其水质问题一直信受社会关注。文章以广东省东莞市同沙水库为例,通过其水库概况,库区水质存在的问题,对其水质净化采用的工艺进行阐述,介绍了其水质净化工程完成后所带来实际效果。可为类似水库水质净化工艺选择提供参考。 展开更多
关键词 同沙水库 水质净化 问题 探讨
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探讨当代中国的建筑之路
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作者 周琦 《建筑与文化》 2004年第11期58-61,共4页
中国面临着历史和现实的巨大挑战与东西方文明的交融与冲突,各种信息与诱惑如潮水股涌来,夹杂着贝壳和泥沙;冲击着我们的思想,我们的文明。作为生活载体的建筑文化,当然也受到这种时代变革的影响,作为继往开来的现代人,我们需要... 中国面临着历史和现实的巨大挑战与东西方文明的交融与冲突,各种信息与诱惑如潮水股涌来,夹杂着贝壳和泥沙;冲击着我们的思想,我们的文明。作为生活载体的建筑文化,当然也受到这种时代变革的影响,作为继往开来的现代人,我们需要崇高的理想,明确的方向和行动的纲领,而不是随波逐流, 展开更多
关键词 中国 同沙大桥 建筑设计 针德会所 高速公路 附属设施
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原位化学灌浆加固岩土工程的现状及展望
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作者 邓敬森 陈雪云 +1 位作者 熊厚金 陈彦生 《地基处理》 2010年第4期19-37,共19页
本文简述了原位化学灌浆加固材料在岩土工程中的应用历史,并对浆材同化、堵漏、加同机理作了归纳,同时,展望了化灌在未来治水、固沙等方面的拓用前景。
关键词 原位 化学灌浆 材料 机理 治水 同沙
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Dynamics Characteristics and Topographic Profile Shaping Process of Feiyan Shoal at the Yellow River Delta 被引量:1
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作者 应铭 李九发 +1 位作者 陈沈良 戴志军 《Marine Science Bulletin》 CAS 2008年第2期74-88,共15页
Feiyan Shoal is a sub Yellow River Delta, which was formed from Jan. 1964 to May 1976, when the Yellow River entered sea via Diaokou Channel. Since the terminal reach shifted to Qingshuigou channel in 1976, Feiyan Sho... Feiyan Shoal is a sub Yellow River Delta, which was formed from Jan. 1964 to May 1976, when the Yellow River entered sea via Diaokou Channel. Since the terminal reach shifted to Qingshuigou channel in 1976, Feiyan Shoal has been experiencing severe erosion and retreat. This paper explains the evolutionary characteristics of the typical profile of Feiyan Shoal from the perspective of dynamical force and sediments' characteristics. All this is on the basis of the data of topographic profiles observed since the 1970s and the samples of hydrology and sediments collected in situ in Apr. 2004, the analysis of the retreating distance, and the tidal and wave friction velocity distribution. Feiyan Shoal topographical profile has experienced a course of "fast erosion and retrogression - slow eroding modulation - fluctuate triggering change" in recent 30 years, which is also the gradual disappearing process of the delta front. The different intensity of sediment erosion resistance is the main reason for the erosion speed changes. Due to the hydrodynamic force changes, the water depth range of maximum retreating distance and between erosion and progradation became shallow. It indicates that the storm tide will still be the triggering force of seashore topographic profile evolutions in the future. 展开更多
关键词 The Yellow River Delta Feiyan Shoal EROSION wave and tidal co-action topographic profile sediment transport
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Petrological characteristics,geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province,China
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作者 张德贤 戴塔根 《Journal of Central South University》 SCIE EI CAS 2011年第4期1217-1225,共9页
The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit ... The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit porphyry, monzonite porphyry and granite porphyry. Petrological chemical analysis results suggest that silica is poor and aluminum is rich, and high potassium large ion lithophile elements (LILE), light rare earth element (LREE) and Sr are obviously detracted in these rocks. High field strength elements (HFSE) and heavy rare earth element (HREE) are depleted, especially Nb, Ta, P and Ti. 8Eu: 0.09--1.64 shows that plagioclase does not appear fractional crystallization during the formation of alkali-rich rocks, t^348, H and O isotopes and Pb isotopes suggest that ore-forming fluid is derived from the mantle, and Pb is possibly mixed by mantle, wall rock and crust. The age of Pb in alkali-rich rocks is about 250-220 Ma. The age of alkali porphyry rock (dykes) varies from 30 Ma to 50 Ma. Alkali rocks have strong metallogenetic relation. Au mineralization is associated to the alkali magrnatic activities with a relatively high temperature, low pressure and high oxygen fugacity. However, copper mineralization is mainly associated with alkali-sub-alkali magmatic activities in a process of relatively low temperature, high pressure and lower oxygen fugacity. 展开更多
关键词 alkali-rich porphyry rocks Sanjiang metallogenetic belt GEOCHEMISTRY metallogenetic relation
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Estimation of aerosol properties over the Chinese desert region with MODIS AOD assimilation in a global model
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作者 YIN Xiao-Mei DAI Tie +4 位作者 XIN Jin-Yuan GONG Dao-Yi YANG Jing TERUYUKI Nakajima SHI Guang-Yu 《Advances in Climate Change Research》 SCIE CSCD 2016年第1期90-98,共9页
A Local Ensemble Transform Kalman Filter assimilation system has been implemented into an aerosol-coupled global nonhydrostatic model to simulate the aerosol mass concentration and aerosol optical properties of 3 dese... A Local Ensemble Transform Kalman Filter assimilation system has been implemented into an aerosol-coupled global nonhydrostatic model to simulate the aerosol mass concentration and aerosol optical properties of 3 desert sites(Ansai, Fukang, Shapotou) in northwestern China. One-month experiment results of April 2006 reveal that the data assimilation can correct the much overestimated aerosol surface mass concentration, and has a strong positive effect on the aerosol optical depth(AOD) simulation, improving agreement with observations. Improvement is limited with the?ngstr€om Exponent(AE) simulation, except for much improved correlation coefficient and model skill scores over the Ansai site. Better agreement of the AOD spatial distribution with the independent observations of Terra(Deep Blue) and Multi-angle Imaging Spectroradiometer(MISR) AODs is obtained by assimilating the Moderate Resolution Imaging Spectroradiometer(MODIS) AOD product, especially for regions with AODs lower than 0.30. This study confirms the usefulness of the remote sensing observations for the improvement of global aerosol modeling. 展开更多
关键词 Aerosol properties Aerosol assimilation Moderate Resolution Imaging Spectroradiometer Multi-angle Imaging Spectroradiometer PM10
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Methods and application of using detrital zircons to trace the provenance of loess 被引量:11
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作者 XIE Jing YANG ShiLing DING ZhongLi 《Science China Earth Sciences》 SCIE EI CAS 2012年第11期1837-1846,共10页
The composition of single-grain detrital zircons is an effective provenance indicator of loess,and sheds new light on dust formation and transportation.Here we review the features of detrital zircons and their use as ... The composition of single-grain detrital zircons is an effective provenance indicator of loess,and sheds new light on dust formation and transportation.Here we review the features of detrital zircons and their use as a provenance indicator,including internal structure,trace element,U-Pb age spectrum and Hf isotopic compositions,and present a case study from the Horqin sandy land and its surrounding loess.The loess samples have detrital zircon age peaks in range of 2600-2300,2100-1600,and 600-100 Ma,of which the 2600-2300 Ma zircon grains mainly have positive Hf(t) values(3.4-8.7),the 2100-1600 Ma zircon grains mainly have negative Hf(t) values(10.1-6.8),and the 600-100 Ma zircon grains have a variable Hf(t) values ranging from 21 to 15.9.The detrital zircon signatures of the loess are similar to the Horqin sandy land,but clearly different from the Chinese Loess Plateau and central-western deserts,implying that the loess is transported mainly from the Horqin sandy land in the Last Glacial period.Comparing these with neighboring tectonic units,we found that zircon populations at 2600-2300,2100-1600,and 600-100 Ma with negative Hf(t) values may come from the northeast North China Craton(NCC),and those at 600-100 Ma with positive Hf(t) values may come from the east Central Asian Orogenic Belt(CAOB).It is estimated that the two sources contribute equally to the Horqin sandy land and the surrounding loess. 展开更多
关键词 loess provenance detrital zircon U-Pb age Hf isotope Horqin sandy land
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Unexpectedly low δ^(13)C in leaves,branches,stems and roots of three acacia species growing in hyper-arid environments
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作者 Daphna Uni Elli Groner +7 位作者 Elaine Soloway Amgad Hjazin Spencer Johnswick Gidon Winters Efrat Sheffer Ido Rog Yael Wagner Tamir Klein 《Journal of Plant Ecology》 SCIE CSCD 2021年第1期117-131,共15页
Aims In plant eco-physiology,less negative(enriched)carbon 13(^(13)C)in the leaves indicates conditions of reducing leaf gas exchange through stomata,e.g.under drought.In addition,^(13)C is expected to be less negativ... Aims In plant eco-physiology,less negative(enriched)carbon 13(^(13)C)in the leaves indicates conditions of reducing leaf gas exchange through stomata,e.g.under drought.In addition,^(13)C is expected to be less negative in non-photosynthetic tissues as compared with leaves.However,these relationships inδ^(13)C from leaves(photosynthetic organs)to branches,stems and roots(non-photosynthetic organs)are rarely tested across multiple closely related tree species,multiple compartments,or in trees growing under extreme heat and drought.Methods We measured leaf-to-root^(13)C in three closely related desert acacia species(Acacia tortilis,A.raddiana and A.pachyceras).We measuredδ^(13)C in leaf tissues from mature trees in southern Israel.In parallel,a 7-year irrigation experiment with 0.5,1.0 or 4.0 L day1 was conducted in an experimental orchard.At the end of the experiment,growth parameters andδ^(13)C were measured in leaves,branches,stems and roots.Important Findings Theδ^(13)C in leaf tissues sampled from mature trees was ca.-27‰,far more depleted than expected from a desert tree growing in one of the Earth's driest and hottest environments.Across acacia species and compartments,δ^(13)C was not enriched at all irrigation levels(-28‰to ca.-27‰),confirming our measurements in the mature trees.Among compartments,leafδ^(13)C was unexpectedly similar to branch and rootδ^(13)C,and surprisingly,even less negative than stemδ^(13)C.The highly depleted leafδ^(13)C suggests that these trees have high stomatai gas exchange,despite growing in extremely dry habitats.The lack ofδ^(13)C enrichment in nonphotosynthetic tissues might be related to the seasonal coupling of growth of leaves and heterotrophic tissues. 展开更多
关键词 stable isotope δ^(13)C enrichment DESERT tree drought resistance Acacia raddiana Acacia tortilis
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