全文获取类型
收费全文 | 532篇 |
免费 | 57篇 |
国内免费 | 64篇 |
专业分类
测绘学 | 5篇 |
大气科学 | 11篇 |
地球物理 | 85篇 |
地质学 | 105篇 |
海洋学 | 252篇 |
天文学 | 2篇 |
综合类 | 22篇 |
自然地理 | 171篇 |
出版年
2023年 | 6篇 |
2022年 | 15篇 |
2021年 | 10篇 |
2020年 | 18篇 |
2019年 | 19篇 |
2018年 | 13篇 |
2017年 | 26篇 |
2016年 | 16篇 |
2015年 | 23篇 |
2014年 | 40篇 |
2013年 | 49篇 |
2012年 | 26篇 |
2011年 | 30篇 |
2010年 | 27篇 |
2009年 | 31篇 |
2008年 | 32篇 |
2007年 | 35篇 |
2006年 | 34篇 |
2005年 | 16篇 |
2004年 | 18篇 |
2003年 | 19篇 |
2002年 | 27篇 |
2001年 | 17篇 |
2000年 | 13篇 |
1999年 | 12篇 |
1998年 | 19篇 |
1997年 | 9篇 |
1996年 | 5篇 |
1995年 | 9篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有653条查询结果,搜索用时 15 毫秒
131.
洱海生物群落的历史演变分析 总被引:20,自引:5,他引:15
根据1957-1997年期间对洱海水体进行的历次综合研究结果分析,由污染引起的氮,磷等营养元素含量升高促进藻类生长繁殖,40年来其密度和生物量上升近10倍;近5年的变化尤为明显,一度出现以螺旋鱼腥藻为主的“水华”。 相似文献
132.
湖泊是全球生态系统的重要组成部分。尽管湖泊初级生产力的生物多样性在湖泊生态系统中发挥着非常重要的作用,但对其如何在千年时间尺度上对气候变化做出响应却知之甚少,而千年时间尺度与预测未来变化最为相关。本文以云南云龙天池湖泊为研究对象,以湖泊重要的初级生产力硅藻为研究手段,分析了末次冰消期期间硅藻生物多样性对千年尺度上气候变化的响应。云龙天池硅藻生物多样性表现为暖期高、冷期低。随着全球温度的快速变化,硅藻生物多样性亦对应的快速响应:在转暖时(Bolling/Allerod暖期)快速增加,在转冷时(Herinrich 1和Younger Dryas)快速降低。这些变化主要与温度变化驱动的湖泊环境条件的变化(比如冰封期长短、边岸带水生植被的变化等)有关。研究结果还表明,在末次冰消期期间,云龙天池湖泊硅藻生物多样性与千年尺度的气候变化同步,而且在长时间尺度上,气候变暖对高山湖泊生物多样性可能是有利的。 相似文献
133.
134.
Jón EIR 《Frontiers of Earth Science》2008,2(4):449-457
A high-resolution diatom record from core MD99-2275 shows a general paleoceanographic change in the northern North Atlantic
since 5000 cal. a B.P. by Principle Component Analysis. Sea surface temperature (SST) increased gradually during 5000 and
3000 cal. a B.P. on the North Icelandic shelf as a result of increasing influence of warm Atlantic water mass from the Irminger
Current. It apparently started to decrease since 3000 cal. a B.P. due to the weakening influence of warm water and enhanced
influence of the Polar and Arctic water masses from the East Greenland Current and the East Icelandic Current. Abrupt decreases
in SST and intrusions of Polar and Arctic water superimposed on the late Holocene cooling trend during 3000-2600, 1300-1000
and 600-200 cal. a B.P.. The paleoceanographic record revealed from core MD99-2275 corresponds well with δ18O record from the GISP2 and is generally consistent with other SST records based on diatom on the North Icelandic shelf.
__________
Translated from Marine Science Bulletin, 2008, 27(5) [译自:海洋通报] 相似文献
135.
Kevin Baker Kristien Ooms Steven Verstockt Pascal Brackman Philippe De Maeyer Rik Van de Walle 《制图学和地理信息科学》2017,44(5):422-435
ABSTRACTRouting and navigation services for leisure activities are conditioned by special needs and trade-offs. The advent of online communities and large crowdsourced datasets offers opportunities to improve the adoption of a user’s perspective in these suggested paths. This paper focuses on achieving two goals. First, the presented methodology analyses a dataset of 190,610 historical GPS traces to gain insights into the appreciation or attractiveness of each edge in a real-world network for a specific leisure activity (i.e. road cycling). Second, as literature on these leisure activities is still sparse, we want to create a thorough understanding of the activities at hand for future work. An appreciation model is proposed and the spread of this score is analyzed in shortest-path alternatives of popular routing engines for this activity. This analysis successfully discriminates these shortest paths based on the scoring value and three morphological parameters of the path. However, the robustness of the model should be improved to ensure the viability of the proposed approach in future work. More specifically, further research on the local optimality of the route choices will be imperative. 相似文献
136.
Community Recovery Following the Deepwater Horizon Oil Spill: Toward a Theory of Cultural Resilience
Hannah E. Clarke 《社会与自然资源》2017,30(2):129-144
Culture plays an important role in communities’ abilities to adapt to environmental change and crises. The emerging field of resilience thinking has made several efforts to better integrate social and cultural factors into the systems-level approach to understanding social–ecological resilience. However, attempts to integrate culture into structural models often fail to account for the agentic processes that influence recovery at the individual and community levels, overshadowing the potential for agency and variation in community response. Using empirical data on the 2010 BP oil spill’s impact on a small, natural-resource-dependent community, we propose an alternative approach emphasizing culture’s ability to operate as a resource that contributes to social, or community, resilience. We refer to this more explicit articulation of culture’s role in resilience as cultural resilience. Our findings reveal that not all cultural resources that define resilience in reference to certain disasters provided successful mitigation, adaptation, or recovery from the BP spill. 相似文献
137.
In the 1920's the Swedish geologist Lennart von Post found evidence of irregular early Holocene isostatic uplift in the region northwest of Lake Vänern in western Sweden. von Post based his conclusions on levellings of ancient shore lines. These were indirectly dated by pollen stratigraphical investigations in basins situated at approximately the same altitudes as the shore lines. To test von Post's hypothesis, we have adopted a different methodological approach. The sediments in twelve small lake basins, within five minor areas in this region, have been investigated with respect to when they became isolated from ancient Lake Vänern. Initially all the lake thresholds were levelled. Altitudes range between 165 and 96 m above sea level. By combining the results of mineral magnetic and diatom stratigraphical analyses it has been possible to determine the level in the sediment when the basin became isolated. The 14C age of this isolation level has been inferred from AMS dates based on the NaOH-soluble fraction of bulk sediment, partly with very low organic content. Altogether, 36 radiocarbon datings have been carried out, ranging from 10080 to 8800 14C years BP. Pollen analyses, and subsequent correspondence analysis (CA) of all pollen spectra, were carried out around the isolation level in each basin as a complement to the AMS datings.If the region had been subject to irregular isostatic uplift, lakes at the same altitude in the five areas should have been isolated at different times. The AMS determined isolation ages, corrected according to CA of the pollen stratigraphy and compensated for the relatively higher rebound of the northerly situated sites support von Post's conclusion, from the beginning of this century, that the region northwest of Lake Vänern has been subjected to irregular isostatic uplift. 相似文献
138.
Florence Sylvestre Simone Servant-Vildary Marc Fournier Michel Servant 《International Journal of Salt Lake Research》1995,4(4):281-300
This study is focused on the endorheic Uyni-Coipasa Basin located in the southern Bolivian Altiplano. Stratigraphical and fossil diatom studies based on a detailed radiocarbon chrnology revealed six phases in water-level changes and paleosalinity variations. At 15,430±80 yr B.P., lacustrine conditions settled in the southern Bolivian Altiplano. A saline lake, characterized by benthic meso-metasaline species, reached +4 m altitude above the present bottom of the basin. After 15,430±80 yr B.P., the level rapidly rose to +27 m, as suggested by a tychoplanktonic mesosaline flora. Between 14,500 years and 13,000 years, finely lanminated sediments at +32 m contained successively a dominance of epiphytic mesosaline to hypersaline species and tychoplanktonic oligosaline diatoms, indicating weak fluctuations in water-level and salinity. At 13,000 years, strong changes in the diatom flora occurred; epiphytic oligo-hypersaline diatoms were replaced by planktonic meso-polysaline species. They indicate a deep salt lake (the lake reached +100 m). After 12,000 years, the lake level abruptly dropped, as suggested by fluviatile sediments with a benthic mesopolysaline diatom flora. The main lake was replaced by shallow saline ponds. A wet pulse occurred at 11,400 years, characterized by low water level (+7 m) and high salinity. This lacustrine phase remained until 10,400 yr B.P. These data indicate changes in Precipitation minus Evaporation (P-E). Our regional interpretations are based on a comparison with teh available data on the northern (Lake Titicaca) and southern (Lipez are) Bolivian Altiplano and on the northern Chilean Altiplano (Atacama Desert). 相似文献
139.
Human disturbance and trophic status changes in Crystal Lake, McHenry County, Illinois, USA 总被引:6,自引:0,他引:6
The paleolimnology (sediment chemistry, 210Pb dating, pollen, and diatoms) of Crystal Lake, McHenry County, Illinois, USA was studied to investigate the impact of European settlement on lake trophic status. Pollen clearly indicates a vegetational shift from Quercus dominance to Ambrosia. 210Pb dating suggests that the Ambrosia rise likely occurs around the 1840's, which is consistent with historical records on the European settlement in this area. Coincident with the vegetational shifts, several diatom species, Cyclotella meneghiniana, Fragilaria crotenensis, Asterionella formosa and Tabellaria fenestrata, all increase while C. comta decreases after the settlement. However, C. comta and Aulacoseira ambigua, two dominant species, remain abundant throughout the entire core. Their relative abundances at the surface sediments reach presettlement levels. It is hypothesized that Crystal Lake, a glacial lake rich in CaCO3, may have been able to assimilate increases of phosphorus by coprecipitating phosphorus with CaCO3. Such a 'buffering mechanism may be responsible for the lake's resistance to trophic changes or recovery following disturbance. 相似文献
140.
In an increasingly urbanised and ageing world the spatial distribution of an older population is a matter of growing scholarly and policy interest. Much of the research on this topic has tended to draw on one of two key measures: structural ageing, or the ratio of older cohorts to the rest of the population, or numeric ageing, which simply counts the number of older people without reference to the rest of the population. This paper argues that, on their own, these measures have limitations, and that considerable value lies in assessing the interplay between numeric and structural ageing measures. The population ageing matrix, a theoretical framework that classifies the demographic dynamics of population ageing across metropolitan areas, is presented and examined through the case study of Perth, Western Australia. The value of the matrix to reveal patterns and trends missed by analyses of single measures is investigated and areas that are experiencing changes in the composition and size of the ageing demographic are identified. The paper also reflects on the implications of these findings for policy and planning. 相似文献