全文获取类型
收费全文 | 263篇 |
免费 | 2篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 23篇 |
废物处理 | 8篇 |
环保管理 | 48篇 |
综合类 | 39篇 |
基础理论 | 62篇 |
污染及防治 | 49篇 |
评价与监测 | 13篇 |
社会与环境 | 22篇 |
灾害及防治 | 5篇 |
出版年
2024年 | 1篇 |
2022年 | 5篇 |
2021年 | 10篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 14篇 |
2016年 | 17篇 |
2015年 | 14篇 |
2014年 | 5篇 |
2013年 | 13篇 |
2012年 | 12篇 |
2011年 | 17篇 |
2010年 | 13篇 |
2009年 | 11篇 |
2008年 | 10篇 |
2007年 | 19篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 9篇 |
2003年 | 6篇 |
2002年 | 8篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 6篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1976年 | 1篇 |
1964年 | 1篇 |
1959年 | 2篇 |
1951年 | 1篇 |
1950年 | 1篇 |
1948年 | 1篇 |
1946年 | 1篇 |
1940年 | 1篇 |
1936年 | 2篇 |
排序方式: 共有269条查询结果,搜索用时 31 毫秒
61.
62.
Discrimination between nestmate and non-nestmate kin by social wasps (Polistes fuscatus,Hymenoptera: Vespidae) 总被引:1,自引:0,他引:1
George J. Gamboa Jeff E. Klahn Allan O. Parman Ruth E. Ryan 《Behavioral ecology and sociobiology》1987,20(2):125-128
Summary The threespine stickleback,Gasterosteus aculeatus is a voracious cannibal of both its own eggs and those of conspecific neighbours. Females, but not males, can distinguish their progeny from those of other fish and attacked alien eggs more frequently. In experiments to examine nest raiding, females that initiated raids on nests resulting in cannibalism were the first females to spawn in the reconstructed nest. These results support the hypothesis that cannibalism by females may be adaptive in situations where intense female competition for male guardians occurs. 相似文献
63.
Land use change around protected areas: management to balance human needs and ecological function. 总被引:6,自引:0,他引:6
Ruth DeFries Andrew Hansen B L Turner Robin Reid Jianguo Liu 《Ecological applications》2007,17(4):1031-1038
Protected areas throughout the world are key for conserving biodiversity, and land use is key for providing food, fiber, and other ecosystem services essential for human sustenance. As land use change isolates protected areas from their surrounding landscapes, the challenge is to identify management opportunities that maintain ecological function while minimizing restrictions on human land use. Building on the case studies in this Invited Feature and on ecological principles, we identify opportunities for regional land management that maintain both ecological function in protected areas and human land use options, including preserving crucial habitats and migration corridors, and reducing dependence of local human populations on protected area resources. Identification of appropriate and effective management opportunities depends on clear definitions of: (1) the biodiversity attributes of concern; (2) landscape connections to delineate particular locations with strong ecological interactions between the protected area and its surrounding landscape; and (3) socioeconomic dynamics that determine current and future use of land resources in and around the protected area. 相似文献
64.
65.
66.
67.
68.
69.
70.
Monika Schaffner Hans-Peter Bader Ruth Scheidegger 《Environment, Development and Sustainability》2011,13(2):403-422
With the worldwide intensification of agriculture, non-point source pollution of surface waters has become a pressing issue.
Conventional river water quality models consider non-point sources as accumulated entries into the rivers and do not investigate
into the processes generating the pollution at its source, thus preventing the determination of effective mitigation measures.
The models require extensive data inputs, which is a deficiency in many developing and emerging countries with limited data
availability. The current study applies a Material Flow Model as a complementary approach to quantify non-point source pollution
from agricultural areas. Rice farming in the Thachin River Basin is presented as a case study, with a focus on nutrients.
The total nitrogen and phosphorus flows from rice farming to the river system are quantified, the key parameters influencing
these flows are determined and potential mitigation measures are discussed. The results show that rice contributes considerable
nutrient loads to the Thachin River Basin. Scenario simulations demonstrate that a significant nutrient load reduction could
be achieved by following the official recommendations for fertilizer application, thus confirming the local efforts to introduce
best management practice. Our results underline the importance of non-point source pollution control in intensive agricultural
areas, particularly of tropical lowland delta areas such as the Central Plains of Thailand. The specific benefit of applying
a Material Flow Model in this context is that with limited data availability, one can reach an understanding of the system
and gain a first overview over its key pollution problems. This can serve as supportive basis for determining consecutive
in-depth research requirements. 相似文献