全文获取类型
收费全文 | 97篇 |
免费 | 6篇 |
国内免费 | 9篇 |
专业分类
地球物理 | 13篇 |
地质学 | 4篇 |
海洋学 | 93篇 |
综合类 | 2篇 |
出版年
2023年 | 1篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 5篇 |
2012年 | 2篇 |
2011年 | 5篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 6篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 8篇 |
2002年 | 3篇 |
2001年 | 6篇 |
2000年 | 10篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1989年 | 1篇 |
排序方式: 共有112条查询结果,搜索用时 109 毫秒
21.
The East Sea, with an average depth of 1700 m, has long been subject to heavy fishing pressure, resulting in derelict fishing gear. Most derelict fishing gears, such as fishing nets, fishing ropes, and crab pots, sink to the seabed and do not degrade. This gear results in “ghost fishing,” which has adverse impacts on deep benthic habitats. Recently, the Korean government has started to remove derelict fishing gears from the deep seabed of the East Sea by bottom trawling with heavy hooks (50–80 kg) and ropes. A total of 207.8 and 252.2 tons of marine debris in 2009 and 2010, respectively, were removed from the seabed, most of which were derelict fishing gears. Contrary to monitoring surveys and clean-up in shallow waters, removal of marine debris from remote deep habitats is much more difficult and dangerous for removal crews. 相似文献
22.
23.
对虾养殖围隔生态系细菌的生物量 总被引:1,自引:0,他引:1
对5个对虾养殖围隔生态系细菌生物量(以C计,下同)的研究结果表明,浮游细菌总生物量波动在0.09~0.83mg/dm3之间,平均0.37±0.21mg/dm3,占水层颗粒有机碳含量的11.94%;附着细菌生物量在(0.14~3.69)x10-2mg/dm3)之间,平均(0.77±0.58)x10-2mg/dm3,占浮游细菌总生物量的2.08%±1.95%。随着养殖时间的推移,浮游细菌总生物量、附着细菌生物量均有所上升。底泥细菌生物量为(44~132)x(10-6m/m),平均(86±23)x(10-6m/m),占底泥有机碳含量的1.55%。 相似文献
24.
辽西地区燕山板内造山带早中生代构造变形的年代学限定 总被引:4,自引:0,他引:4
在辽西进行的构造研究确认了这里曾经在早中生代期间发生过几次重要的构造变形事件,地质上,这几次构造变形的时代被限定在中三叠世老虎沟组沉积之后到晚侏罗世髫髻山/蓝旗组火山岩喷发之前。期间,第一期逆冲推覆构造被水泉沟组不整合覆盖,第二期逆冲推覆构造被髫髻山组/蓝旗组不整合覆盖。本文通过对水泉沟组火山岩、邓杖子组火山岩砾石、髫髻山组底部火山岩以及侵位到逆冲构造岩片中的安山玢岩脉体进行锆石SHRIMP法U-Pb定年,比较准确地限定了燕山板内造山带早中生代几次构造变形的时代。这对于研究燕山板内造山带早期变形特征和变形历史、研究整个燕山造山带的变形过程都具有重要的意义。 相似文献
25.
ML Camara B Mérigot F Leprieur JA Tomasini I Diallo M Diallo 《African Journal of Marine Science》2016,38(2):189-206
In a context of growing fishing pressures and recommendations for an ecosystem approach to fisheries, there is a need to monitor changes in fish communities over time. In this study, we analysed data from scientific trawl surveys carried out on the continental shelf off Guinea between 1985 and 2012. We performed factorial analyses and calculated biodiversity indices to characterise the changes in the structure and composition of fish communities that occurred over the 28-year period in this area, particularly given intensive fishing activities. We show that, over the study period, fish communities on the Guinean shelf were structured primarily according to spatial factors, with temporal changes being less pronounced than expected. However, a temporal analysis of biodiversity indices and species dominance showed that the intensification of fishing had significant effects on the general ecological features of the fish assemblages under study. There was a decrease in fish density and in mean trophic level. In addition, there were changes in species dominance, whereby large, slow-growing species with high commercial value were gradually replaced by smaller, fast-growing species of lesser commercial interest. These results from field observations are in line with some conclusions from previous modelling studies in the same geographical area, and provide further support for the hypothesis of a progressive ‘ecosystem effect of fishing’ occurring in Guinean waters. 相似文献
26.
27.
28.
29.
30.