昆仑山北麓叶城县荒地资源的开发利用问题     

贾宝全 《干旱区地理》1993,16(1):43-48

本文在实地考察的基础上,结合有关资料,分析了叶城具荒地资源开发利用过程中存在的问题,并针对这些问题提出了一些整治措施。  相似文献   

吐鲁番盆地天然草场资源评价及其合理利用   总被引：1，自引：0，他引：1  

贾宝全  阎顺 《干旱区地理》1994,17(1):57-62

本文讨论了吐鲁番盆地天然草场类型及其资源评价，利用中存在的问题，并提出几点合理利用的意见。  相似文献   

福建南平西坑铌钽矿区玉帝庵矿段含矿伟晶岩特征   总被引：1，自引：0，他引：1  

陈宝泉 《福建地质》2008,27(3):281-288

南平西坑铌钽矿区玉帝庵矿段含矿伟晶岩沿玉帝庵复式背斜及两翼展布,贮存于下元古界麻源群南山组中。根据伟晶岩矿物成分,结构及其共生关系可分为石英块体9个主要矿物组合类型。矿段内伟晶岩造岩矿物基本相同,主要有石英、钠长石、腐锂辉石、微斜长石、白云母等,铌钽铁矿除了与钠长石共生外,还呈迭片状、板状嵌布于白云母中。  相似文献   

Human remains and the environment of Early Pleistocene in the Nihewan Basin     

CAI Baoquan & LI Qiang . Department of History  Xiamen University  Fujian  China  . Institute of Vertebrate Palaeontology  Palaeoanthropology  Chinese Academy of Sciences  Beijing  China 《中国科学D辑(英文版)》2004,47(5)

The Nihewan (Nihowan) Basin is well known in the world for producing abundant mammal fossils and paleoliths. As one issue of the program 搕he early hominid evolution and environmental background in East Asia?a biostratigraphic survey was made in July 2001, and a large number of mammal fossils were un-earthed and 5 lithic artifacts were recognized from the Majuangou gully in the Nihewan Basin, Hebei Prov-ince, North China. 1 Stratigraphic section The new site is located on the south bank…  相似文献   

A new oil spill detection algorithm based on Dempster-Shafer evidence theory     

Zhang  Tianlong  Guo  Jie  Xu  Chenqi  Zhang  Xi  Wang  Chuanyuan  Li  Baoquan 《中国海洋湖沼学报》2022,40(2):456-469

Journal of Oceanology and Limnology - Features of oil spills and look-alikes in polarimetric synthetic aperture radar (SAR) images always play an important role in oil spill detection. Many oil...  相似文献   

三疣梭子蟹低盐适应相关的SNP开发     

冯艳艳  张德宁  吕建建  高保全  李健  刘萍 《海洋学报(英文版)》2019,38(8):41-47

盐度是影响三疣梭子蟹人工繁育非常重要的一个环境因素,抗低盐品系的三疣梭子蟹受到水产养殖界的广泛喜爱。分子标记辅助育种可以大大加快良种选育和性状改良的的过程,目前作为第三代的分子标记技术的SNP,广泛应用到三疣梭子蟹耐低盐品系选育过程中。本实验室已有的研究中,通过不同群体分别在盐度11和33下的基因表达差异,构建的比较转录组学数据中总共包含了615条与低渗调节相关的基因片段。为了发掘三疣梭子蟹与低盐适应相关SNP,本研究基于三疣梭子蟹比较转录组学数据研究结果,筛选出低盐调节相关候选基因片段50条,设计引物进行PCR扩增,共得到总长为18511 bp的DNA片段。通过直接测序法在低盐相关片段上发现了85个SNP位点,分布频率为0.46/100 bp,其中转换突变的比例为81%,颠换突变的比例为19%,转换的比例远远大于颠换,符合“transition bias”原理。C/T或G/A突变所占比例为55%;G/T或C/A比例为26%,A/T突变所占比例为12%,G/C突变比例为7%。通过飞行质谱法,在三疣梭子蟹低盐适应性状分离群体中各成功分型了23个SNP位点。通过卡方检验分析发现,8个SNPs与低盐适应显著相关（P<0.05）。其中有三个关联性SNP位点位于表皮蛋白基因上,有三个SNP位点位于三个新基因上,其他两个SNP位点分别位于水通道蛋白和氯离子通道蛋白基因上。这些标记的开发为三疣梭子蟹耐低盐新品种选育方法的建立奠定了良好的基础。  相似文献   

黄河三角洲关键种泥螺Bullacta exarata对沉积物-水体界面溶解氧和营养盐通量的影响     

李宝泉  Bouma Tjeerd J.  王全超  Soissons Laura M.  Cozzoli Francesco  冯光海  李晓静  周政权  陈琳琳 《海洋学报(英文版)》2019,38(8):48-55

泥螺自2001因养殖目的引入黄河三角洲以来,随着分布范围的扩大和种群数量的增长,已成为当地潮间带的关键种。泥螺给当地民众带来较高收入,但其对底栖生态系统的潜在影响还不清楚。为了明确该种群的生物扰动对底栖微藻和微生物的初级生产,以及对水体-沉积物界面营养盐交换的影响,开展了该项实验。结果表明,在光照条件下,泥螺能显著影响沉积物-水体界面的溶解氧DO通量;在黑暗及无生物处理组的恢复期,泥螺能显著增加两界面间氨氮的通量。底栖微藻和小型生物在黑暗条件下也能增加氨氮的通量;但在有光照条件下,上述微藻和小型底栖动物对沉积物-水体界面间溶解氧和氨氮通量的影响不明显。实验结果为更深入理解泥螺对生态系统的影响提供重要理论支持。  相似文献   

Community structure of macrobenthos in coastal water off Rushan, southern Shandong Peninsula, and the relationships with environmental factors   总被引：6，自引：1，他引：5  

LIXinzheng  LIBaoquan  WANGHongf  WANGJinbao  WANGXiaochen  ZHOUJin  HANQingxi  MALin  DONGChao  ZHANGBaolin 《海洋学报(英文版)》2009,28(5):81-93

To understand the present actuality of the marine ecosystem in the southern coastal water region of the Shandong Peninsula and the impact of the global change and the human activities to the marine ecosystem of the region,the macrobenthic community structure was researched based on data from 26 sampling stations carried out on four seasonal cruises from December 2006 to November 2007.The data was analyzed using PRIMER 6.0 and SPSS 15.0 software packages.The results showed that 236 macrobenthic species in total were collected from the research region by the field works.Most of the species belong to Polychaeta (76 species),Mollusca (75) and Crustacea (60).Of which,33 species were common species by the four cruises.The dominant species were different among the four seasons,however,the polychaete species Nephtys oligobranchia and Sternaspis scutata were always dominant in the four seasons.The abundances and biomasses of the macrobenthos from the research region were variable in the four seasons.The results of CLUSTER and MDS analysis showed that the similarities of macrobenthic structures among the stations were low,most of the similarities were at about 40% of similarity values,only that of two stations were up to 60%.In accordance with the similarity values of the macrobenthic structures,the 26 stations were clustered as six groups at arbitrary similarity level of 30%.The ABC curve indicated that the marcofauna communities in the research region had not been disturbed distinctly.The results of BIOENV and BVSTEP (Spearman) analysis implied that the concentrations of organic matter in bottom water and heavy metal copper in sediment,water depth and temperature of bottom were the most significant environmental factors to affect the macrobentic community.  相似文献   

Assessing benthic ecological status in coastal area near Changjiang River estuary using AMBI and M-AMBI   总被引：4，自引：0，他引：4  

刘录三  李宝泉  林岿璇  蔡文倩  王全超 《中国海洋湖沼学报》2014,32(2):290-305

The Changjiang （Yangtze） River estuary has been subject to a variety of anthropogenic pressures in recent decades. To assess the ecological health of the coastal benthic ecosystem adjacent to the estuary, three surveys were conducted in 2005, 2009, and 2010. The AZTI＇s Marine Biotic Index （AMBI） and multivariate-AMBI （M-AMBI） were used to analyse the benthic ecological status of this coast. The AMBI indicate that the ecological status of the coast adjacent to the Changjiang River estuary was only slightly degraded in all 3 years. In contrast, the M-AMBI indicated that the ecological status was seriously degraded, a result that is most likely due to pollution and eutrophication induced by human activities. The assessment of the coast＇s ecological status by the AMBI was not in agreement with that of the M-AMBI at some stations because of lower biodiversity values at those sites. The analysis of the two indices integrated with abiotic parameters showed that the M-AMBI could be used as a suitable bio-indicator index to assess the benthic ecological status of the coast adjacent to the Changjiang River estuary. The reference conditions proposed for the coast of the Changjiang River estuary should be further evaluated in future studies. Designation of local species could also provide an important reference for Chinese waters. To improve the reliability of AMBI and M-AMBI, further research into the ecology of local species is required to understand their arrangement in ecological groups.  相似文献   

基于碳氮稳定同位素技术的小清河口邻近海域底栖食物网结构研究   总被引：1，自引：1，他引：0  

张传鑫  陈静  纪莹璐  陈琳琳  李海汇  王全超  李宝泉  邢荣莲 《海洋学报》2022,44(1):89-100

为了掌握小清河口邻近海域底栖食物网结构特征,于2020年10月在小清河口邻近海域采集沉积物有机质、悬浮颗粒有机物、浮游动物和浮游植物4种潜在食源及35种生物样本,应用碳氮稳定同位素技术以及贝叶斯混合模型(MixSIAR)分析了小清河口邻近海域底栖食物网结构和营养关系.结果显示,潜在食源的δ13C值范围为-25.56‰～...  相似文献