全文获取类型
收费全文 | 799篇 |
免费 | 47篇 |
国内免费 | 42篇 |
专业分类
测绘学 | 60篇 |
大气科学 | 104篇 |
地球物理 | 67篇 |
地质学 | 133篇 |
海洋学 | 14篇 |
天文学 | 8篇 |
综合类 | 43篇 |
自然地理 | 459篇 |
出版年
2023年 | 3篇 |
2022年 | 18篇 |
2021年 | 13篇 |
2020年 | 35篇 |
2019年 | 42篇 |
2018年 | 25篇 |
2017年 | 30篇 |
2016年 | 25篇 |
2015年 | 25篇 |
2014年 | 27篇 |
2013年 | 68篇 |
2012年 | 20篇 |
2011年 | 28篇 |
2010年 | 18篇 |
2009年 | 31篇 |
2008年 | 38篇 |
2007年 | 40篇 |
2006年 | 36篇 |
2005年 | 43篇 |
2004年 | 43篇 |
2003年 | 29篇 |
2002年 | 32篇 |
2001年 | 41篇 |
2000年 | 58篇 |
1999年 | 24篇 |
1998年 | 24篇 |
1997年 | 11篇 |
1996年 | 11篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有888条查询结果,搜索用时 234 毫秒
881.
LIU Xiaokang DONG Zhibao DING Yaping LU Ruijie LIU Liyun DING Zhiyong LI Yijing 《地理学报(英文版)》2022,32(10):1956-1968
The Mu Us dune field in China has become a focal region for research of the prevention and control of desertification. Agricultural practices in this area have been modernized in recent years, evidenced by the development of Center Pivot Irrigation(CPI) farmlands.However, the impacts of CPI farmlands on combating desertification remain poorly understood. This study chose the southeastern part of the Mu Us dune field as a study area to investigate the variations of CPI farmlands from 2009 to 2018... 相似文献
882.
基于基塘系统保护的国土空间治理策略——以顺德区为例 总被引:1,自引:0,他引:1
以佛山市顺德区作为实证研究案例,采用野外调研、访谈等研究方法,剖析基塘与国土空间的协同发展机制,提出基于多功能基塘的国土空间治理策略。结果表明:顺德国土空间治理面临空间破碎化和空间嵌套分布、灾害与生态风险加剧、岭南水乡文化特色日渐流失等问题;协调基塘与不同地域子系统之间的功能耦合关系,发挥基塘对地域系统功能的支撑与协同作用,是实现国土空间协同发展和可持续利用的基础;实施基塘功能分区治理,保护集中连片基塘,整合基塘文化资源,推进基塘与村级工业园、村边塘、村心塘协同治理等策略,发挥基塘的多功能作用,有助于实现国土空间的安全、高效与可持续利用。 相似文献
883.
884.
885.
886.
亚洲季风与中国干湿、农牧气候界线之关系 总被引:11,自引:4,他引:11
基于中国553个气象站点1958~2000年日降水量资料、北方295个气象站点同期(20(cm)蒸发皿资料,界定出半干旱区和农牧交错区各自的范围。利用东亚夏季风强度指数(1951~1995年)与印度夏季降水量(1951~1998年)资料, 分析了半干旱区和农牧交错区东南-西北界10年际空间变化与亚洲夏季风的关系。近50年中国干湿、农牧气候界线的动态变化是影响中国的季风环流强弱作用在空间上的实物表现, 季风环流的强弱变化控制着气候界线空间摆动的范围与方向, 其年代际变化是中国干湿、农牧气候界线呈现出年代际变化特征的根源。分析显示, 在现代情况下, 农牧气候界线位置的空间摆动主要反映人类生产活动强度的强弱差异, 人为因素起主导作用。 相似文献
887.
Rolf Guttesen 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(2):81-91
The article deals with aspects of the historical geography of the Faeroe Islands in the 19th century with a focus on animal production, i.e. sheep and cows. It is based on material from the Regional Archive, Føroya Landsskjalasavn. The tithe lists showing the King's third from Norderöe district, 1801–1859, are analysed in detail and compared with the statements from another series of documents, the Sheriff s half-yearly reports on the state of the district. Together these two sets of records give a detailed picture of the development and variation in the number of cows, paying “butter-tithe” and the number of sheep slaughtered, paying “wool-tithe”. The number of cows surviving the winter, depended on the amount and quality of winter fodder or hay, which was produced in the infield the preceding summer. The sheep, on the other hand, that can survive the winter while grazing in the outfield, are dependent on the severity or mildness of the winter as well as their condition in the lambing period. The two series provide data on summer as well as winter weather conditions. The analysis makes an attempt, using the concepts known from the critical realist theory of science, to find the mechanisms as well as necessary and contingent conditions involved in the two processes. 相似文献
888.
Approximately ten years have passed since Globally Important Agricultural Heritage Systems (GIAHS) was introduced to Japan in 2011, with 11 GIAHS sites designated so far. The Japan Nationally Important Agricultural Heritage Systems (J-NIAHS), which considers resilience, multi-stakeholder participation and sixth industrialization, was subsequently established in 2016, and has designated 15 J-NIAHS sites. GIAHS sites can be classified into three major types: Landscape, farming method, and genetic resource conservation types, and most Japanese GIAHS sites are of the landscape type. Since there is almost no national subsidy for GIAHS or J-NIAHS, designated sites are expected to secure funding for conservation from their own efforts. For this reason, a voluntary network of the Japanese GIAHS sites has been active in promoting cooperation on GIAHS conservation. The priorities of the Japanese GIAHS have focused on raising public awareness about GIAHS and J-NIAHS, improving livelihoods, as well as fostering the international exchange of experience and knowledge regarding Agricultural Heritage Systems, especially among Japan, China and Korea. 相似文献