全文获取类型
收费全文 | 2402篇 |
免费 | 131篇 |
国内免费 | 506篇 |
专业分类
安全科学 | 202篇 |
废物处理 | 142篇 |
环保管理 | 300篇 |
综合类 | 1319篇 |
基础理论 | 602篇 |
环境理论 | 1篇 |
污染及防治 | 259篇 |
评价与监测 | 120篇 |
社会与环境 | 78篇 |
灾害及防治 | 16篇 |
出版年
2024年 | 3篇 |
2023年 | 23篇 |
2022年 | 46篇 |
2021年 | 62篇 |
2020年 | 83篇 |
2019年 | 67篇 |
2018年 | 58篇 |
2017年 | 64篇 |
2016年 | 84篇 |
2015年 | 99篇 |
2014年 | 162篇 |
2013年 | 182篇 |
2012年 | 191篇 |
2011年 | 212篇 |
2010年 | 191篇 |
2009年 | 141篇 |
2008年 | 122篇 |
2007年 | 188篇 |
2006年 | 175篇 |
2005年 | 127篇 |
2004年 | 102篇 |
2003年 | 104篇 |
2002年 | 92篇 |
2001年 | 88篇 |
2000年 | 69篇 |
1999年 | 71篇 |
1998年 | 35篇 |
1997年 | 35篇 |
1996年 | 25篇 |
1995年 | 20篇 |
1994年 | 23篇 |
1993年 | 21篇 |
1992年 | 19篇 |
1991年 | 10篇 |
1990年 | 15篇 |
1989年 | 5篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 4篇 |
排序方式: 共有3039条查询结果,搜索用时 546 毫秒
581.
582.
Tobias Roth Lukas Kohli Beat Rihm Reto Meier Valentin Amrhein 《Conservation biology》2021,35(6):1766-1776
Nitrogen (N) deposition from agriculture and combustion of fossil fuels is a major threat to plant diversity, but its effects on organisms at higher trophic levels are unclear. We investigated how N deposition may affect species richness and abundance (number of individuals per species) in butterflies. We reviewed the peer-reviewed literature on variables used to explain spatial variation in butterfly species richness and found that vegetation variables appeared to be as important as climate and habitat variables in explaining butterfly species richness. It thus seemed likely that increased N deposition could indirectly affect butterfly communities via its influence on plant communities. To test this prediction, we analyzed data from the Swiss biodiversity monitoring program for vascular plants and butterflies in 383 study sites of 1 km2 that are evenly distributed throughout Switzerland. The area has a modeled N deposition gradient of 2–44 kg N ha−1 year−1. We used traditional linear models and structural equation models to infer the drivers of the spatial variation in butterfly species richness across Switzerland. High N deposition was consistently linked to low butterfly diversity, suggesting a net loss of butterfly diversity through increased N deposition. We hypothesize that at low elevations, N deposition may contribute to a reduction in butterfly species richness via microclimatic cooling due to increased plant biomass. At higher elevations, negative effects of N deposition on butterfly species richness may also be mediated by reduced plant species richness. In most butterfly species, abundance was negatively related to N deposition, but the strongest negative effects were found for species of conservation concern. We conclude that in addition to factors such as intensified agriculture, habitat fragmentation, and climate change, N deposition is likely to play a key role in negatively affecting butterfly diversity and abundance. 相似文献
583.
LAUREL R. FOX 《Conservation biology》2007,21(6):1556-1561
Abstract: Species with known demographies may be used as proxies, or approximate models, to predict vital rates and ecological properties of target species that either have not been studied or are species for which data may be difficult to obtain. These extrapolations assume that model and target species with similar properties respond in the same ways to the same ecological factors, that they have similar population dynamics, and that the similarity of vital rates reflects analogous responses to the same factors. I used two rare, sympatric annual plants (sand gilia [ Gilia tenuiflora arenaria ] and Monterey spineflower [ Chorizanthe pungens pungens ]) to test these assumptions experimentally. The vital rates of these species are similar and strongly correlated with rainfall, and I added water and/or prevented herbivore access to experimental plots. Their survival and reproduction were driven by different, largely stochastic factors and processes: sand gilia by herbivory and Monterey spineflower by rainfall. Because the causal agents and processes generating similar demographic patterns were species specific, these results demonstrate, both theoretically and empirically, that it is critical to identify the ecological processes generating observed effects and that experimental manipulations are usually needed to determine causal mechanisms. Without such evidence to identify mechanisms, extrapolations among species may lead to counterproductive management and conservation practices. 相似文献
584.
神农架野生珍稀濒危植物及其保护对策研究 总被引:4,自引:0,他引:4
李兆华 《长江流域资源与环境》1992,1(1):8-54
本文研究表明神农架共有国家保护的野生珍稀濒危植物21科26属28种(包括变种)。保护植物之生活型以高位芽植物占绝对优势,花期主要集中于4~5月,果期主要集中于9~11月。本文还从就地保护和迁地保存两方面阐述了珍稀濒危植物的保护对策。 相似文献
585.
586.
川西草原十字花科油料植物资源的研究和利用 总被引:12,自引:0,他引:12
首次对四川西部草原的野生十字花科油料植物资源作了比较系统的调查研究,收集植株和种子标本约12属20种。经过种子油分分析和引种观察,筛选出几种有特种用途且适应力较强的植物资源。这些植物资源是蕴藏量大的食用油料播娘蒿(Descurainia sophia)、菥蓂(Thlaspi arvense),高亚油酸的优质食用油料植物高蔊菜(Rorippa elata),高亚麻酸的工业用油料植物涩荠(Malcolmia africana)、独行菜(Lepidiumapetalum)等。可供进一步的开发利用。 相似文献
587.
火电厂废水的净化与回收利用 总被引:3,自引:0,他引:3
李贤贵 《石油化工环境保护》2001,(4)
针对火电厂废水悬浮物含量高、粒径小、难分离、废水量大的特点 ,采用高浊度废水净化技术 ,优化工艺流程 ,实现了火电厂所有废水的净化与回收利用 ,且经济效益显著。 相似文献
588.
Effects of mercury contaminated rice from typical chemical plant area in China on nitric oxide changes and c-fos expression of rats brain 总被引:3,自引:0,他引:3
CHENG Jin-ping WANG Wen-hu JIA Jin-ping HU Wei-xuan SHI Wei Lin Xue-yu 《环境科学学报(英文版)》2005,17(2):177-180
IntroductionMercury(Hg) ,asoneoftheprioritypollutantandhottopicinthefrontofenvironmentalresearchinmanycountries ,hasbeenpaidhigherattentionintheworldsincethemiddleoflastcentury .Chinaisthethirdlargestmercuryproducer,GuizhouProvince(2 4°3 0′— 2 9°13′N 相似文献
589.
The kinds and the distribution of the coal in China are investigated.The results indicated that the 80% coal in China is used by the method of the coal gasification.The possibility of utilization and development of the fuel cell power plant in China is analyzed.A combined cycle generation system is designed.Its net electrical efficiency is about 55%(LHV),which is higher than that of the fire power plant.So it is environmental-friendly and high-efficient generation mode. 相似文献
590.
秦岭淮河以南地区具有平原型气象特征,大气污染扩散有其地域性规律。大型火力发电厂在地方大气污染防治中有着举足轻重的地位。探讨平原型污染气象与火电厂除尘效率的关系,寻求大气污染物 总量控制的途径。 相似文献