海洋浮游植物对磷的响应研究进展   总被引：3，自引：0，他引：3  

金杰  刘素美 《地球科学进展》2013,28(2):253-261

磷是海洋浮游植物赖以生存的一种必需营养元素.海洋浮游植物对磷的响应,与初级生产力、碳循环以及固氮作用密切相关.总结了浮游植物可利用的磷源:优先吸收溶解无机磷;在寡磷海域,可通过相关酶类协助利用溶解有机磷来抵御无机磷的缺乏.对比了不同种类浮游植物对不同形态磷源利用方式的差异并从浮游植物生理学角度阐述了存在差异的根本原因.探讨了浮游植物对低磷环境的响应机制.近期的研究发现浮游植物细胞表面可以吸附磷,该发现有利于更加准确地衡量浮游植物承受的营养盐限制问题,进一步完善对海洋磷储库及其生物地球化学循环的认识.最后提出了今后需进一步研究的关键科学问题:浮游植物细胞表面吸附磷的机制;对不同结构有机磷化物的利用机理;浮游植物对磷的海洋生物地球化学循环的响应及反馈作用.  相似文献   

过氧化钠碱熔-电感耦合等离子体发射光谱法测定钛铁矿中铬磷钒   总被引：3，自引：2，他引：1  

王卿  赵伟  张会堂  周长祥  回寒星 《岩矿测试》2012,31(6):971-974

样品经过氧化钠碱熔,溶解后的上层清液直接酸化,用电感耦合等离子体发射光谱测定钛铁矿中铬、磷、钒的含量。确定了钛铁矿石中Cr、P、V的分析谱线、光谱级次;为了消除钠盐基体的影响,确定稀释因子为1000,标准曲线基体与样品基体保持一致;为避免过氧化钠熔矿后溶液碱性较大对进样系统造成腐蚀,加入2.00 mL盐酸对溶液进行酸化。方法检出限为4.46～23.55μg/g,采用国家一级标准物质进行验证,方法准确度小于10%,精密度为0.68%～9.90%。本法与分光光度法单一元素测定相比较,具有测量范围宽、结果准确、操作简便、省时省力、适合大批量样品测定等突出的优点。  相似文献   

铁（氢）氧化物悬液中磷酸盐的吸附-解吸特性研究   总被引：2，自引：0，他引：2  

王小明  孙世发  刘凡  谭文峰  胡红青  冯雄汉 《地球化学》2012,(1):89-98

铁（氢）氧化物对P的吸持和释放在一定程度上决定着P的生物有效性和水体富营养化。以两种环境中常见晶质铁氧化物（针铁矿和赤铁矿）为对照,采用X射线衍射（XRD）、透射电镜（TEM）、热重分析（TGA）和孔径分析以及动力学和吸附-解吸热力学平衡等技术方法,研究了弱晶质水铁矿对P吸附-解吸特性,并探讨了相关机制。实验表明,三种矿物对P的吸附分为起始的快速反应和随后的慢速反应,它们均符合准一级动力学过程,反应中OH释放明显滞后于P吸附,P吸附经历了从外围到内囤配位、单齿到多齿配位过渡的过程,与晶质氧化铁比,水铁矿吸附容量和OH释放量更大、慢速吸附反应更快、存在缓慢扩散反应阶段,吸附容量依次是：水铁矿（436μmol／m^2）〉针铁矿（262μmol／m^2）〉赤铁矿（228μmol／m^2）,针铁矿和赤铁矿吸附P符合L（Langmuir）模型,而水铁矿更符合F（Fremldlictl）模型。中性盐介质（KCl）中在最大吸附量时P的解吸率依次为：水铁矿（85％）〈针铁矿（10％）〈赤铁矿（125％）,柠檬酸通过配体解吸和诱导溶解两种机制促进P的解吸,最大吸附量时解吸率依次是：针铁矿（25％）〈水铁矿（32％）〈赤铁矿（50％）。  相似文献   

新疆冰草沟矿床铀、磷相关性研究     

周宏伟  党龙  张利 《新疆地质》2012,30(2):221-225

北天山褶皱带博格达复背斜南翼二叠系含磷砂岩、粉砂岩,华力西晚期安山玢岩中发育大量铀异常矿化点,冰草沟矿床在该区铀、磷成矿特征研究程度较高。通过对冰草沟矿床铀、磷矿化特征、赋存部位与矿体空间关系进行对比,结合铀、磷化学成因与成矿期联系,认为铀、磷矿为同体共生关系,在该区具综合找矿意义。  相似文献   

南宁市南湖水体富营养化进程研究     

韦岩松  陶增才  童张法  吴烈善  李海德 《南方国土资源》2006,(4):26-27

文章通过对南宁市南湖水体水质的采样和实验室分析,总结出2003～2005年南湖水体富营养化的进程状况,并探讨了造成这种状况的原因,提出了一些改善建议.  相似文献   

Mining and geological knowledge during the Neolithic： a geological study on the variscite mines at Gavà, Catalonia     

AntoniCamprubl&#; Joan-CariesMelgarejo Joaqu&#;nA.Proenza FidelCosta JosepBosch Al&#;ciaEstrada FerranBorell NikolaiP.Yushkin ValentinL.Andreichev 《《幕》》2003,26(4):295-301

The Gavd Neolithic Mining Complex (GNMC) near Barcelona was active during the Neolithic age, since ca. 6000 BP until about 700 years after. These mines show up to five different underground mining levels, developed as galleries and chambers, communicated through pits, drawing a complex network with a total known length of over 1000 m. These are some of the oldest underground mines in Europe but, contrary to the rest of the mine workings known of the same epoch, this is the only mining complex reported to date whose aim was not mining for conventional substances for the epoch such as chert, ochre or copper. The main aim of the GNMC was variscite, a green phosphate mineral similar to turquoise that can be easily cut and polished to make ornaments such as necklaces or bracelets. This paper is focused mainly on the geological mapping and examination in surface and underground exposures of the different phosphate mineralization types(stratabound and veins) and other relevant geological features such as discordances, thrusts, faults, and folds.  相似文献   

红海湾养殖区底质水中氮、磷的分布特征     

王小平  贾晓平  林钦  甘居利  李纯厚  王增焕  蔡文贵  吕晓瑜 《广东海洋大学学报》1999,(4)

着重研究了红海湾养殖区底质水中 NO-3 -N、NO-2 -N、NH 4-N、PO3 -4 -P、有机质及 c( NO-3 -N) /c P 和 ∑c N/c P( ∑c N=c( NO-2 ) c( NO-3 ) c( NH 4) )比值的分布特征 ,并对该湾低质水中氮、磷及有机质的季节变化及其它们之间的相互关系作了讨论 ,结果表明 :在春、夏、冬三个季节中 ,NH 4-N的浓度比NO-2 -N及 NO-3 -N高 ,春季 NH 4-N的平均浓度为 92 .60 μm ol/L,占总无机氮 80 .57% ;夏季浓度为4 7.0 4μmol/L ,占总无机氮 61 .64 % ;冬季 NH 4-N的浓度最低 ,为 9.60μmol/L ,占总无机氮 4 5.76% ;而夏季 PO3 -4 -P浓度及有机质的含量比春、冬季高 ,分别为 53 .68μm ol/L和 1 .3 62 %。分析指出该湾底质水中无机氮是以 NH 4-N为主要存在形态。  相似文献   

Biogeochemical characteristics of nitrogen and phosphorus in Jiaozhou Bay sediments   总被引：3，自引：0，他引：3  

李学刚  宋金明  袁华茂  戴纪翠  李宁 《中国海洋湖沼学报》2007,25(2):157-165

Sediment samples were cored from 3 locations representing the inner bay, the outer bay and the bay mouth of Jiaozhou Bay in September 2003 to study the source and biogeochemical characteristics of nitrogen and phosphorus in the bay. The content and vertical distributions of total nitrogen （TN）, total phosphorus （TP）, organic nitrogen （ON）, organic phosphorus （OP）, inorganic nitrogen （IN）, inorganic phosphorus （IP）, the ratio of organic carbon and total nitrogen （OC/TN）, and the ratio of total nitrogen and total phosphorus （TN/TP） in the sediments were analyzed. The results show that both TN and TP in surface sediments decrease from the inner bay to the outer bay. In general, ON occupies 50%-70% of TN and IP accounts for more than 60% of TP. In ratio of OC：TN, the nitrogen accumulated in the sediments from the inner bay and the bay mouth came mainly from terrestrial sources, and the portion of autogenetic nitrogen was 28.9% and 13.1%, respectively. However, in the outer bay, nitrogen was mainly autogenetic, accounting for 62.1% of TN, whereas phosphorus was mainly land-derived. The sedimentation fluxes of nitrogen and phosphorus varied spatially. The overall diagenesis rate of nitrogen was higher than that of phosphorus. Specifically, the diagenesis rate of OP was higher than that of IP. However, the diagenesis rate of ON was not always higher than that of IN. In species, the diagenesis rate of IN is sometimes much higher than that of the OC. In various environments, the diagenesis rate is, to some degree, affected by OC, pH, Eh, and Es.  相似文献   

BIOGEOCHEMICAL PROCESSES OF PHOSPHORUS AND SILICON IN SOUTHERN BOHAI SEA SURFACE SEDIMENTS   总被引：3，自引：0，他引：3  

宋金明  罗延馨  吕晓霞  李鹏程 《中国海洋湖沼学报》2002,20(4):378-383

Based on the author’s previously obtained results on P and Si forms in southern Bohai Sea surface sediments,this study maindy foucusing on the controlling factors,existence forms,and biogeo-chemical processes of P and Si showed that the transferable forms of phosphorus in sediments were mainly controlled by the mineralization of organic matters and the reduction of high-valence iron;whereas the transferable forms of silicon were possibly controlled by the dissolution and precipitation as well as bio-chemical processes of living organisms.  相似文献   

中国新崛起的金矿资源基地——贵州省金矿勘探开发情况简介     

寇生 《贵州地质》2008,25(3)

矿产资源是大自然赐予贵州的宝贵财富。今天,依托丰富的矿产资源发展起来的煤炭、电力、化肥、磷化工、钡化工、炼铝、炼铁、黄金、磨料等工业企业,已成为贵州工业的主要支柱。矿产是不可再生的资源,用一点少一点,总有穷尽之日。矿产资源的勘查成果,是成千上万地质工作者用心血、汗水乃至生命换来的,来之不易。从这一期开始,本刊陆续将我省一些矿种的发现、勘探和开发情况介绍给读者。希望唤起人们对矿产资源的珍视,"惜我资源,护我环境,利我地方,惠我群众",用好这笔天赐的宝贵财富。还希望地质工作者能从前人的工作经验中得到启发,做出新的建树。  相似文献