全文获取类型
收费全文 | 1383篇 |
免费 | 156篇 |
国内免费 | 505篇 |
专业分类
安全科学 | 298篇 |
废物处理 | 33篇 |
环保管理 | 105篇 |
综合类 | 1020篇 |
基础理论 | 277篇 |
污染及防治 | 104篇 |
评价与监测 | 66篇 |
社会与环境 | 92篇 |
灾害及防治 | 49篇 |
出版年
2024年 | 14篇 |
2023年 | 45篇 |
2022年 | 106篇 |
2021年 | 106篇 |
2020年 | 105篇 |
2019年 | 69篇 |
2018年 | 72篇 |
2017年 | 61篇 |
2016年 | 67篇 |
2015年 | 103篇 |
2014年 | 87篇 |
2013年 | 128篇 |
2012年 | 106篇 |
2011年 | 131篇 |
2010年 | 112篇 |
2009年 | 97篇 |
2008年 | 89篇 |
2007年 | 113篇 |
2006年 | 112篇 |
2005年 | 68篇 |
2004年 | 57篇 |
2003年 | 45篇 |
2002年 | 40篇 |
2001年 | 30篇 |
2000年 | 41篇 |
1999年 | 13篇 |
1998年 | 5篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 2篇 |
排序方式: 共有2044条查询结果,搜索用时 15 毫秒
11.
Controlled-release fertilizer(CRF):A green fertilizer for controlling non-point contamination in agriculture 总被引:9,自引:0,他引:9
Fertilizers contribute greatly to high yields but also result in environmental non-point contamination, including the emission of greenhouse gas(N2O) and eutrophication of water bodies. How to solve this problem has become a serious challenge, especially for China as its high ecological pressure. Controlled-release fertilizer(CRF) has been developed to minimize the contamination while keeping high yield and has become a green fertilizer for agriculture. Several CRFs made with special coating technology were used for testing the fertilizer effects in yield and environment through pot experiment and field trial. The result indicated that the CRFs had higher N use efficiency, thus reducing N loss through leaching and volatilization while keeping higher yields. Comparing with imported standard CRFs,the test on CRFs showed similar fertilizer effect but with much lower cost. CRFs application is becoming a new approach for minimizing non-point contamination in agriculture. 相似文献
12.
ZHANG Jian-ying QIU Li-min HE Jia LIAO Yuan LUO Yong-ming College of Environmental Resource Sciences Zhejiang University Hangzhou China. Soil Environment Bioremediation Research Center Institute of Soil Science Chinese Academy of Sciences Nanjing China 《环境科学学报(英文版)》2007,(3)
A total of 198 agricultural soil samples were collected from Zhangjiagang and Changshu in Southern Jiangsu for analysis of 13 polychlorinated biphenyls (PCBs) in order to assess the levels of pollution, sources, area distribution, and potential risk for the environment. All methods were rigorously tested and an adequate quality control was ensured. Only one site had no PCBs residues, and the highest total PCBs concentration in the surface soils was 32.83 ng/g. The average concentration in all the soil samples was 4.13 ng/g, signaling low-level pollution. Tetra-, penta-, and hexa-chlorinated biphenyls were dominant species in soil samples, accounting for more than 75% ofΣPCBs in the soil samples. PCB118 was the most abundant congener in all the samples. The PCB118 was about 20% ofΣPCBs. The soil organic matter content showed only a weak correlation with the levels of all PCB congeners, in which a better correlation was noted for the more volatile lighter PCB congeners than for the heavier homologues. To a certain extent, the sources and land use seemed to influence the levels of PCBs. 相似文献
13.
环境保护与公众参与--绿色中国第九届论坛在京隆重召开 总被引:1,自引:0,他引:1
以“环境保护与公众参与”为主题的第九届“绿色中国论坛”,于12月3日在北京昆仑饭店隆重召开,这是2005中国环境文化节的重头戏。全国人大副委员长许嘉璐、全国政协副主席陈奎元.中宣部副部长胡振民.全国政协人资环委副主任温克刚等领导同志。来自清华大学.中国政法大学等著名高校的知名专家学者和企业家代表.文化界代表。以及全国70多家环保组织负责人应邀到会。国家环保总局副局长潘岳主持了论坛开幕式。并致开幕词。潘岳副局长还邀请中宣部副部长欧阳坚为本次论坛致词。本刊精编了论坛上的精彩发言,在此与读者共同分享。[编者按] 相似文献
14.
15.
16.
我国环保基础设施建设融资的ABS方式 总被引:1,自引:0,他引:1
本文阐述了我国环保基础设施建设资金短缺的情况,指出必须利用金融创新为环保融资服务,ABS融资就是其中的一种方法。本文介绍了ABS融资方式的涵义,并提出了其在环保基础设施融资方面所具有的优势,即保障国家安全、降低融资风险、降低融资成本、筹资前景广阔和改善公司财务状况,同时,也指出了使用ABS方式进行融资的所应当注意的一些问题,即保障可预期的现金流问题以及风险管理问题,并针对这些问题提出了相应的解决对 相似文献
17.
18.
19.
20.