广西北部湾海洋腐木产孢真菌的分离鉴定和抗菌活性菌株筛选          下载免费PDF全文

龚斌  方怀义  熊拯  义翠花  廖日权  宋静静  张艳秋 《应用海洋学学报》2017,36(1):096-102

采集广西北部湾钦州附近月亮湾、钦州港和茅尾海海域海洋腐木,采用稀释法分离纯化得到32株产孢真菌,对真菌的菌落、孢子和菌丝形态进行研究,32株真菌可被分为5种真菌类型,其中第I、II和III种类型的真菌仅分离于月亮湾,第IV和V种类型在3个样品采集地均有分离.通过ITS基因测序表明,32株真菌为5个不同的种,其分别属于子囊菌门(Ascomycota)和接合菌门(Zygomycota),可以确定种属的包括伞状霉属(Umbelopsis)和青霉菌属(Penicillium),其中分离的青霉菌属在数量上具有优势,占分离菌株总数的75%,属于优势种属.采用4种指示菌大肠杆菌(E.coli)、蜡样芽孢杆菌(Bacillus cereus)、烟草节杆菌(Arthrobacter nicotianae)、副溶血弧菌(Vibrio parahaemolyticus)检测抑菌活性,发现两株伞状霉属真菌Umbelopsis sp.B10和Umbelopsis sp.B9菌丝体提取物对四种指示菌均具有较强的抑制作用,另外两株青霉属真菌Penicillium sp.A5和Penicillium sp.B7的菌丝浸出物分别对革兰氏阳性细菌和革兰氏阴性副溶血弧菌具有较强的抑制活性.本研究为首次报道广西北部湾海洋腐木真菌及其抗菌活性.  相似文献   

基于生态敏感性和生态系统服务的黑河中游生态功能区划与生态系统管理   总被引：1，自引：1，他引：0  

尤南山  蒙吉军 《中国沙漠》2017,37(1):186-197

生态功能区划是协调生态保护与经济发展的矛盾、实施区域生态系统管理的重要途径。以黑河中游为研究区,基于基础地理信息数据、自然地理数据和土地覆被数据（1986、1995、2000、2010、2011年）,在生态敏感性和生态系统服务重要性分析的基础上,以最小子流域为基本单元,运用二阶聚类法进行生态功能区划;并依据主导生态系统服务对研究区进行分区管理与生态调控。得出结论：（1）黑河中游生态系统类型以荒漠、草地和农田为主,占总面积的90%;森林、水域、城镇与农村居民点零星分布,所占面积不到10%;1986-2010年,农田经历了减少-扩张-再减少的变化,但城镇与农村居民点一直呈现扩张趋势;（2）西北部生态敏感性明显高于东南部,其中极敏感区（约占24%）主要位于张掖-临泽-高台平原北侧、合黎山、祁连山山前戈壁与荒漠、肃南明花区;高度敏感区（约占58%）分布于走廊中部冲洪积平原;（3）各生态系统服务重要性空间分布格局具有一定的相似性,非常重要和极重要综合服务功能区约占3.2%,位于走廊中部的黑河干流缓冲区内;中等和一般重要地区约占20%,分布在山丹和民乐境内祁连山、焉支山、龙首山附近;（4）黑河中游可分为祁连山森林草地生态区、走廊冲洪积平原农田生态区和走廊北部平原灌丛荒漠生态区3个生态区8个生态功能区,依其主导生态系统服务分为生态保育区、生态协调区和生态控制区3类,进而提出了对应的生态系统管理措施。  相似文献   

1979-2016年祁连山地区大气水汽含量时空特征及其与降水的关系     

巩宁刚  孙美平  闫露霞  宫鹏  马兴刚  牟建新 《干旱区地理》2017,40(4):762-771

采用1979-2016年ECMWF1.5°×1.5°逐月再分析资料及同期37个气象站点的降水资料,利用一元线性回归、累积距平、Kriging及IDW（反距离加权）等方法分析了祁连山地区大气水汽含量时空分布特征、降水转化率空间变化规律以及风场分布规律,并对比分析了中国西部不同地区降水转化率的变化趋势。结果表明：（1）1979-2016年祁连山地区大气水汽含量整体呈增加趋势,且季节变化明显。其中夏季是各层大气水汽含量最多的季节,高达329.24 mm,占多年平均大气水汽含量的48.1%。（2）近38 a来,祁连山地区的大气水汽含量呈东南多、西北少的空间分布,且随海拔的升高而逐渐减少,整层大气水汽主要集中在5 000 m以下。（3）祁连山地区的降水转化率从空间上表现出由东向西递减的趋势,说明该地区空中云水资源的开发潜力自东向西逐渐增强,空中云水资源的开发潜力区域差异明显;季风所携带的水汽对其影响区域的降水贡献率较高,西风所携带的水汽则对其影响区域的降水贡献率较低。（4）中国西部地区降水转化率呈向心式递减的趋势,且区域空间波动较大。  相似文献   

Assessment of Urban Air Pollution and Spatial Spillover Effects in China: Cases of 113 Key Environmental Protection Cities     

GONG Zezhou  ZHANG Xiaoping 《资源与生态学报(英文版)》2017,8(6):584-594

With rapid urbanization and energy consumption, environmental pollution and degradation have become increasingly serious problems in China. At the beginning of 2013, China implemented new ambient air quality standards (GB 3095-2012) in which the concentration of six pollutants including PM_2.5, ozone, carbon monoxide, PM₁₀, sulfur dioxide and nitrogen dioxide were monitored. This study gathered annual air pollutant concentration data for the six pollutants in 113 key environmental protection cites throughout China in 2014 and 2015 to explain spatial patterns of urban air pollution. Based on the Kernel density estimation method, spatial hotspots of air pollution were illustrated through which spatial cluster of each pollutants could be plotted. By employing an entropy evaluation system, urban air quality was assessed in terms of the six atmospheric pollutants. We conclude that, in general, CO and SO₂ were two important pollutants in most Chinese cities, but this varied greatly among cities. The assessment results indicate that cities with the worst air quality were mainly located in northern and central provinces, dominantly in the Beijing-Tianjin-Hebei metropolitan area. Regression modeling showed that a combination of meteorological factors and human-related determinants, to say specifically, industrialization and urbanization factors, greatly influenced urban air quality variation in China. Results from spatial lag regression modeling confirmed that air pollution existed obvious spatial spillover effects among key cities. The spatial interdependence effects of urban air quality means that Chinese municipal governments should strengthen regional cooperation and deepen bilateral collaboration in terms of air regulation and pollution prevention.  相似文献   

Planning Method of Non-Development Zone in Southern Jiangyin     

QIN Xianhong  GONG Zhidong  SUN Haohao 《资源与生态学报(英文版)》2017,8(6):635-640

Jiangyin was the earliest to conduct Non-development zone planning and has attracted the attention of people all over China because it is regarded as the Chinese version of Smart Growth. The planning process is as follows. Based on SPOT and TM satellite remote sensing images develop a regional land use map with high precision using artificial interpretation methods. Then, according to the relationship between anti-development suitability and disasters, agriculture, ecology, built-up area distribution and other geographical factors, generate a comprehensive evaluation chart of anti-development suitability using GIS analysis, such as buffer analysis and overlay analysis. Later, with a regional land use map and anti-development suitability evaluation chart, using the principle of ecological security network and learning from the management experience of nature reserves, draw the scope of Non-development zone and core area. Last, put forward a series of protective measures for the above Non-development zone, that is only allowed to develop agriculture and tourism, strictly restricted industrial projects and urban real estate activities, and all existing industrial factories must be moved to planned industrial parks. This is good practice whereby local governments keep land resources for future generations and more advanced than an urban expansion strategy. This method is very useful for promoting land use layout optimization in Southern Jiangsu Developed Areas.  相似文献   

Fluid Inclusions and Hydrogen,Oxygen, and Lead Isotopes of the Antuoling Molybdenum Deposit,Northern Taihang Mountains,China   总被引：1，自引：0，他引：1       下载免费PDF全文

Meng Zhe  Jian‐zhong Hu  Yang Song  Xue‐qin Zhang  Hai‐yang Ding  Wei Zhou 《Resource Geology》2017,67(4):399-413

The Antuoling Mo deposit is a major porphyry‐type deposit in the polymetallic metallogenic belt of the northern Taihang Mountains, China. The processes of mineralization in this deposit can be divided into three stages: an early quartz–pyrite stage, a middle quartz–polymetallic sulfide stage, and a late quartz–carbonate stage. Four types of primary fluid inclusions are found in the deposit: two‐phase aqueous inclusions, daughter‐mineral‐bearing multiphase inclusions, CO₂–H₂O inclusions, and pure CO₂ inclusions. From the early to the late ore‐forming stages, the homogenization temperatures of the fluid inclusions are 300 to >500°C, 270–425°C, and 195–330°C, respectively, with salinities of up to 50.2 wt%, 5.3–47.3 wt%, and 2.2–10.4 wt% NaCl equivalent, revealing that the ore‐forming fluids changed from high temperature and high salinity to lower temperature and lower salinity. Moreover, based on the laser Raman spectra, the compositions of the fluid inclusions evolved from the NaCl–CO₂–H₂O to the NaCl–H₂O system. The δ¹⁸O_H2O and δD values of quartz in the deposit range from +3.9‰ to +7.0‰ and ?117.5‰ to ?134.2‰, respectively, reflecting the δD of local meteoric water after oxygen isotopic exchange with host rocks. The Pb isotope values of the sulfides (²⁰⁸Pb/²⁰⁴Pb, 36.320–37.428; ²⁰⁷Pb/²⁰⁴Pb, 15.210–15.495; ²⁰⁶Pb/²⁰⁴Pb, 16.366–17.822) indicate that the ore‐forming materials originated from a mixed upper mantle–lower crust source.  相似文献   

河南省济源盆地下侏罗统鞍腰组重力流沉积特征及其构造意义^*          下载免费PDF全文

杨文涛  吴蒙  杨旅涵  史飞  梁厅 《古地理学报》2017,19(3):433-444

在详细野外剖面工作的基础上,通过岩性特征、沉积构造及沉积序列等的系统观察研究,发现济源盆地下侏罗统鞍腰组重力流沉积由滑塌沉积、砂质碎屑流沉积和浊流沉积构成。滑塌沉积以砂岩和泥岩的混杂、岩层的滑动变形以及泥岩呈碎块被卷入砂岩层中为特征;砂质碎屑流沉积常呈厚层块状,颗粒分选和磨圆较差,杂基较多,可见漂浮于层内的石灰岩砾石;常见的浊流沉积分为2种类型: 具有明显正粒序结构的浊流沉积和砂泥岩薄互层的浊流沉积,可用鲍马序列来描述。鞍腰组重力流沉积可划分为3个沉积序列: 序列A记录了滑塌沉积→砂质碎屑流沉积→浊流沉积→深湖沉积的转换过程;序列B表现为砂质碎屑流与浊流沉积的叠覆;序列C由浊流及湖泊沉积构成,并经历了由序列A→序列B→序列C的沉积演化过程。重力流的形成受秦岭造山带于早侏罗世沿三门峡—鲁山—舞阳断裂发生逆冲推覆作用的控制,其沉积演化指示了秦岭造山带造山作用由强到弱的过程。  相似文献   

河南省三门峡尖草地铝土矿地质特征及成矿演化模式     

李建全  席善峰  赵晓宁  李书文  赵钦  冯建涛  王猛  裴满意 《地质与资源》2017,26(6):564-569

以三门峡尖草地铝土矿床为对象,在研究矿床地质特征的基础上,分析了成矿物质来源、控矿因素,并刻画了成矿演化模式.三门峡尖草地铝土矿床赋矿层位为本溪组,是在沉积间断面、沉积古地理、古构造等多个条件的耦合作用下形成的.该地层后期抬升遭受剥蚀,再沉积形成局部堆积型的铝土矿床.其成矿演化模式在豫西地区具有典型找矿意义.  相似文献   

浅谈内蒙古大兴安岭地区中南部侏罗系与白垩系之界线     

曲洪祥  徐桓  龚全德  杜士澍  高文勃  仲米山  谭超  王一树  吴昊  张磊  陈泽翰 《地质与资源》2017,26(5):439-444

通过对大兴安岭地区侏罗系与白垩系之间不整合面的讨论,以地层区域对比及同位素测年数据等信息确定其界线,达到本区侏罗系与白垩系界线的可识别性、客观性和稳定性之目的.同时,对该区主要地层形成的大地构造环境的研究,认为土城子组是碰撞造山后伸展阶段形成的一套陆相红层,也是侏罗纪结束的标准层;而满克头鄂博组、玛尼吐组和白音高老组则是碰撞造山后垮塌阶段形成的火山地层.以大规模火山爆发为特征,本区开始了白垩纪地壳演化阶段.侏罗系与白垩系界线位于土城子组与满克头鄂博组之间,二者界线以区域不整合（假整合）为特征,不整合面形成于碰撞造山后伸展与垮塌的转换时期.  相似文献   

湖北随州黑龙潭金矿石英Rb-Sr同位素年龄及其地质意义     

彭三国  胡俊良  刘劲松  朱江  龚银杰 《地质通报》2017,36(5):867-874

通过矿物流体包裹体Rb-Sr同位素测年,获得鄂北黑龙潭金矿石英Rb-Sr等时线年龄为132.6±2.7Ma,表明该金矿床形成于早白垩世中期。矿石石英中流体包裹体Sr同位素初始比(~(87)Sr/~(86)Sr)i平均值为0.710798,小于陆源硅酸盐的值(0.720),高于地幔Sr的初始值(0.707),暗示成矿物质来源于壳幔混合。结合各类岩矿石Au丰度变化,S、Pb、H、O等同位素组成,以及稀土和微量元素特征、成矿流体等研究,认为该矿床的形成可能与燕山期持续伸展阶段大规模构造-岩浆活动有关,燕山期中酸性岩浆活动为金矿成矿提供了主要矿源和热源。  相似文献