全文获取类型
收费全文 | 240篇 |
免费 | 16篇 |
国内免费 | 75篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 1篇 |
环保管理 | 39篇 |
综合类 | 150篇 |
基础理论 | 76篇 |
污染及防治 | 15篇 |
评价与监测 | 4篇 |
社会与环境 | 18篇 |
灾害及防治 | 19篇 |
出版年
2023年 | 4篇 |
2021年 | 1篇 |
2018年 | 3篇 |
2017年 | 1篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2011年 | 27篇 |
2010年 | 13篇 |
2009年 | 9篇 |
2008年 | 7篇 |
2007年 | 15篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 47篇 |
2003年 | 28篇 |
2002年 | 10篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 10篇 |
1998年 | 8篇 |
1997年 | 22篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 7篇 |
1993年 | 15篇 |
1992年 | 14篇 |
1991年 | 20篇 |
1989年 | 8篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1961年 | 2篇 |
1957年 | 1篇 |
1933年 | 1篇 |
排序方式: 共有331条查询结果,搜索用时 15 毫秒
211.
绿肥可以解决有机肥源不足的困难,减少化肥用量,节省成本和能源消耗,改善土壤环境,提高土壤肥力和地力;提高作物产量和产品质量;促进畜牧业的发展。本文根据广东的实际,指出广东的现代化农业需要大种绿肥,也可以大种绿肥。要使广东的绿肥生产得到恢复和发展,必须抓好如下的措施:从战略高度来认识绿肥的重要性;加强领导,把它提到重要的议事日程上来;广泛开展试验示范,并加强宣传发动;增加经济投入,省、市、县各级要设立绿肥种子繁育和经营风险金。 相似文献
212.
我国工业固体废物污染治理行业2006年发展报告 总被引:2,自引:0,他引:2
中国环境保护产业协会固体废物处理利用委员会 《中国环保产业》2007,(11):12-15
本文介绍了2006年我国工业固体废物的产生、排放以及治理状况;概述了近年来国内工业固体废物处理利用技术取得的进展及重点发展领域,并对固体废物处理利用行业的发展提出了建议。 相似文献
213.
214.
中国环境保护产业协会水污染治理委员会 《中国环保产业》2007,(9):50-53
本文通过调查52家水污染治理企业,总结了我国水污染治理行业2006年的基本情况,阐述了行业发展的主要进展和目前存在的主要问题及对策建议,并对行业的发展进行了展望。 相似文献
215.
全国个体防护装备标准化技术委员会秘书处 《中国个体防护装备》2005,(5):33-36
2005年8月10日,全国个体防护装备标准化技术委员会换届会议在广西北海市顺利召开。全国个体防护装备标准化技术委员会自诞生以来,先后进行过三次换届.此次换届,是在2004年经国家标准化管理委员会对全国标准化技术委员会清理整顿之后,按国家标准化管理委员会的要求,在国家安全生产监督管理总局的直接领导下进行的, 相似文献
216.
217.
Distribution of various aluminum fractions in surface water of the Le An River
ResearchCenterforEco-EnvironmentalSciences,Beijing100085,ChinaAbstract—Totalcon... 相似文献
218.
Effect of applying selenium fertilizer to improve soil and increase selenium level in food for prevention and treatment of Kaschin-Beck disease 总被引:3,自引:0,他引:3
Chen Daizhong Ren Shangxue Lu Wulong Li Jiyun Fan Lihong Jia Zhenhu Zhang Fujing Xu Lijing Zhang Xuan 《环境科学学报(英文版)》1993,5(3):299-309
For prevention and treatment of Kaschin-Beck disease by applying Se fertilizer to soil to increase Se up to normal level for the wheat grains is introduced in this paper. After use this measure the intake of Se by the residents in the exemplary area increased from 10.4μg to 33.6 μg per day in average. After supplementing Se to human body one year, there is no new patient found among 300 healthy children in the exemplary area but 4 patients found among 264 healthy children in the control area. It is shown that by applying Se fertilizer to KBD area is a effective way for preventing and cure this disease. 相似文献
219.
Before 1970s the Second Songhua River and Ji Canal of China had been polluted seriously by mercury. During peak pollution period, mercury levels in water, sediment and fish body of these rivers were close to or even higher than that of famous Minamata Bay of Japan. Some residents who live near to the polluted rivers were affected and the methyl mercury values in their blood, hair and urine were higher than normal people obviously . Since the fish had decreased even vanished in these rivers, so the food chain that transfers mercury to human also was out off almostly. However, nervous symptoms of Minamata disease were discovered among fisherman who had eaten more fishes. This report relates the stories about the mercury pollution of the Second Songhua River and Ji Canal. 相似文献
220.
HUANG Ze-chun AN Zhi-zhuang CHEN Tong-bin LEI Mei XIAO Xi-yuan LIAO Xiao-yong Centre for Environmental Remediation Institute of Geographical Sciences Natural Resources Research Chinese Academy of Sciences Beijing China. 《环境科学学报(英文版)》2007,(6)
In order to understand the similarity or difference of inorganic As species uptake and transport related to phosphorus in As-hyperaccumulator,uptake and transport of arsenate(As(V))and arsenite(As(III))were studied using Pteris vittata L.under sandculture.Higher concentrations of phosphate were found to inhibit accumulation of arsenate and arsenite in the fronds of P.vittata.The reduction in As accumulation was greater in old fronds than in young fronds,and relatively weak in root and rhizome.Moderateincreases,from 0.05 to 0.3 mmol/L,in phosphate reduced uptake of As(III)more than As(V),while the reverse was observed at highconcentrations of phosphate(1.0 mmol/L).Phosphate apparently reduced As transport and the proportion of As accumulated in frondsof P.vittata when As was supplied as As(V).It may in part be due to competition between phosphorus and As(V)during transport.Incontrast,phosphate had a much smaller effect on As transport when the As was supplied as As(III).Therefore,the results from presentexperiments indicates that a higher concentration of phosphate suppressed As accumulation and transport in P.vittata,especially inthe fronds,when exposed to As(V);but the suppression of phosphate to As transport may be insignificant when P.vittata exposed toAs(III)under sand culture conditions.The finding will help to understand the interaction of P and As during their uptake process in P.vittata. 相似文献