首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   11163篇
  免费   420篇
  国内免费   3695篇
安全科学   805篇
废物处理   647篇
环保管理   1062篇
综合类   5669篇
基础理论   2098篇
环境理论   2篇
污染及防治   3730篇
评价与监测   408篇
社会与环境   359篇
灾害及防治   498篇
  2024年   5篇
  2023年   149篇
  2022年   481篇
  2021年   389篇
  2020年   281篇
  2019年   262篇
  2018年   355篇
  2017年   457篇
  2016年   413篇
  2015年   557篇
  2014年   803篇
  2013年   1047篇
  2012年   905篇
  2011年   1054篇
  2010年   774篇
  2009年   688篇
  2008年   749篇
  2007年   614篇
  2006年   515篇
  2005年   397篇
  2004年   518篇
  2003年   588篇
  2002年   391篇
  2001年   312篇
  2000年   310篇
  1999年   326篇
  1998年   297篇
  1997年   355篇
  1996年   258篇
  1995年   208篇
  1994年   148篇
  1993年   184篇
  1992年   157篇
  1991年   112篇
  1990年   60篇
  1989年   34篇
  1988年   27篇
  1987年   10篇
  1986年   19篇
  1985年   12篇
  1984年   12篇
  1983年   10篇
  1982年   16篇
  1981年   8篇
  1975年   1篇
  1974年   3篇
  1973年   1篇
  1972年   2篇
  1971年   1篇
  1968年   1篇
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
411.
Conflicts between local people's livelihoods and conservation have led to many unsuccessful conservation efforts and have stimulated debates on policies that might simultaneously promote sustainable management of protected areas and improve the living conditions of local people. Many government‐sponsored payments‐for‐ecosystem‐services (PES) schemes have been implemented around the world. However, few empirical assessments of their effectiveness have been conducted, and even fewer assessments have directly measured their effects on ecosystem services. We conducted an empirical and spatially explicit assessment of the conservation effectiveness of one of the world's largest PES programs through the use of a long‐term empirical data set, a satellite‐based habitat model, and spatial autoregressive analyses on direct measures of change in an ecosystem service (i.e., the provision of wildlife species habitat). Giant panda (Ailuropoda melanoleuca) habitat improved in Wolong Nature Reserve of China after the implementation of the Natural Forest Conservation Program. The improvement was more pronounced in areas monitored by local residents than those monitored by the local government, but only when a higher payment was provided. Our results suggest that the effectiveness of a PES program depends on who receives the payment and on whether the payment provides sufficient incentives. As engagement of local residents has not been incorporated in many conservation strategies elsewhere in China or around the world, our results also suggest that using an incentive‐based strategy as a complement to command‐and‐control, community‐ and norm‐based strategies may help achieve greater conservation effectiveness and provide a potential solution for the park versus people conflict.  相似文献   
412.
广州市环境监测管理信息化建设中若干问题探讨   总被引:1,自引:0,他引:1  
以广州市环境监测中心站推进信息化的实践为例,重点对环境监测管理信息化规划、开发和应用3个环节所涉及的信息化进程路线、应用系统开发的需求分析和推广应用等问题进行了一些探讨,提出切合自身的解决思路或办法。  相似文献   
413.
Environmental Science and Pollution Research - Groundwater pollution seriously threatens water resource safety due to high-intensity land use throughout the world. However, the relationship between...  相似文献   
414.
Environmental Science and Pollution Research - In the face of the global haze crisis, exploring the driving force of political factors for controlling minute atmospheric particles has become...  相似文献   
415.
Environmental Science and Pollution Research - In this study, the degradation performance of nutrients in zeolite trickling filter (ZTF) with different influent C/N ratios and aeration conditions...  相似文献   
416.
Environmental Science and Pollution Research - This study explores the symmetric and asymmetric effects of physical infrastructure on energy consumption, economic growth, and air pollution of...  相似文献   
417.

Nanoplastics are widely distributed in freshwater environments, but few studies have addressed their effects on freshwater algae, especially on harmful algae. In this study, the effects of polystyrene (PS) nanoplastics on Microcystis aeruginosa (M. aeruginosa) growth, as well as microcystin (MC) production and release, were investigated over the whole growth period. The results show that PS nanoplastics caused a dose-dependent inhibitory effect on M. aeruginosa growth and a dose-dependent increase in the aggregation rate peaking at 60.16% and 46.34%, respectively, when the PS nanoplastic concentration was 100 mg/L. This caused significant growth of M. aeruginosa with a specific growth rate up to 0.41 d?1 (50 mg/L PS nanoplastics). After a brief period of rapid growth, the tested algal cells steadily grew. In addition, the increase in PS nanoplastics concentration promoted the production and release of MC. When the PS nanoplastic concentration was 100 mg/L, the content of the intracellular (intra-) and extracellular (extra-) MC increased to 199.1 and 166.5 μg/L, respectively, on day 26, which was 31.4% and 31.1% higher, respectively, than the control. Our results provide insights into the action mechanism of nanoplastics on harmful algae and the potential risks to freshwater environments.

  相似文献   
418.
Environmental Science and Pollution Research - The concentrations of major and trace elements in the sediments from the Four River inlets of Dongting Lake were analysed. The results show that the...  相似文献   
419.
Environmental Science and Pollution Research - In recent years, the development and utilization of water resources have imposed great impacts on hydrological characteristics and ecological...  相似文献   
420.
Environmental Science and Pollution Research - In the process of water treatment, excessive nitrogen and phosphorus pollutants are of great concern. Therefore, we prepared nanoscale zerovalent iron...  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号