全文获取类型
收费全文 | 17874篇 |
免费 | 894篇 |
国内免费 | 6353篇 |
专业分类
安全科学 | 1262篇 |
废物处理 | 1058篇 |
环保管理 | 1405篇 |
综合类 | 10110篇 |
基础理论 | 3074篇 |
环境理论 | 4篇 |
污染及防治 | 5943篇 |
评价与监测 | 739篇 |
社会与环境 | 699篇 |
灾害及防治 | 827篇 |
出版年
2024年 | 8篇 |
2023年 | 273篇 |
2022年 | 844篇 |
2021年 | 679篇 |
2020年 | 553篇 |
2019年 | 534篇 |
2018年 | 661篇 |
2017年 | 770篇 |
2016年 | 818篇 |
2015年 | 1010篇 |
2014年 | 1367篇 |
2013年 | 1875篇 |
2012年 | 1556篇 |
2011年 | 1633篇 |
2010年 | 1214篇 |
2009年 | 1181篇 |
2008年 | 1234篇 |
2007年 | 1149篇 |
2006年 | 1049篇 |
2005年 | 760篇 |
2004年 | 521篇 |
2003年 | 642篇 |
2002年 | 577篇 |
2001年 | 492篇 |
2000年 | 534篇 |
1999年 | 537篇 |
1998年 | 462篇 |
1997年 | 408篇 |
1996年 | 382篇 |
1995年 | 321篇 |
1994年 | 262篇 |
1993年 | 202篇 |
1992年 | 172篇 |
1991年 | 101篇 |
1990年 | 78篇 |
1989年 | 59篇 |
1988年 | 54篇 |
1987年 | 32篇 |
1986年 | 25篇 |
1985年 | 15篇 |
1984年 | 16篇 |
1983年 | 18篇 |
1982年 | 11篇 |
1981年 | 14篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1976年 | 2篇 |
1975年 | 4篇 |
1974年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
61.
Dynamics and Causation of Environmental Equity, Locally Unwanted Land Uses, and Neighborhood Changes
Feng Liu 《Environmental management》1997,21(5):643-656
/ Why are some environmental risks distributed disproportionately in the neighborhoods of the minorities and the poor? A hypothesis was proposed in a recent study that market dynamics contributed to the current environmental inequity. That is, locally unwanted land uses (LULUs) make the host communities home to more poor people and people of color. This hypothesis was allegedly supported by a Houston case study, whereby its author analyzed the postsiting changes of the socioeconomic characteristics of the neighborhoods surrounding solid waste facilities. I argue that such an analysis of postsiting changes alone is insufficient to test the causation hypothesis. Instead, I propose a conceptual framework for analysis of environmental equity dynamics and causation. I suggest that the presiting neighborhood dynamics and the characteristics of control neighborhoods be analyzed as the first test for the causation hypothesis. Furthermore, I present theories of neighborhood change and then examine alternative hypotheses that these theories offer for explaining neighborhood changes and for the roles of LULUs in neighborhood changes. These alternative hypotheses should be examined when analyzing the relationship between LULUs and neighborhood changes in a metropolitan area. Using this framework of analysis, I revisited the Houston case. First, I found no evidence that provided support for the hypothesis that the presence of LULUs made the neighborhoods home to more blacks and poor people, contrary to the conclusion made by the previous study. Second, I examined alternative hypotheses for explaining neighborhood changes-invasion-succession, other push forces, and neighborhood life-cycle; the former two might offer better explanation.KEY WORDS: Environmental equity and justice; Locally unwanted lane uses; Siting; Market dynamics; Invasion-succession; Neighborhood changes 相似文献
62.
63.
Lu Jiehua Wang Hongbo & Pan Yi . Institute of Population Research Peking University Beijing China . Department of Sociology University of California at Los Angeles Los Angeles USA. 《中国人口.资源与环境(英文版)》2005,3(1)
INTRODUCTIONIn recent thirty years, due to the decreasing fertility andincreasing life expectancy, China's population is aging ata very rapid pace and the elderly population size is keepingon growing. During the dramatic aging progress, the oldestold group in China is catching our eyes. More and moreold people of China are becoming the oldest old. Theextremely old population (aged 80 and above) is increasingat 5.1% annually, while the old population above 65 isincreasing at 2.9%, and the… 相似文献
64.
Zheng Lei Li Dewen Song Shuzheng Wang Hongtu Sui Jinjun 《Environment, Development and Sustainability》2022,24(3):3110-3125
Environment, Development and Sustainability - In order to reveal the distribution and migration law of downwind and upwind coal cutting, total dust (TD) and respirable dust (RD) concentration... 相似文献
65.
Zhang Yuqing Zhan Chengcheng Wang Hui Gao Ya 《Environment, Development and Sustainability》2022,24(8):9777-9808
Environment, Development and Sustainability - This study analyzes the evolution of the land use structure, demographic reconstruction, and social reconstruction of Dachangshan Island, Changhai... 相似文献
66.
Jiao Youzhou Xue Huizan He Chao Wang Zigang Ma Xiaoran Liu Xinxin Liu Liang Chang Chun Petracchini Francesco Li Panpan 《Environment, Development and Sustainability》2022,24(4):4709-4726
Environment, Development and Sustainability - Anaerobic digestion (AD) is an attractive straw resource treatment technology as it can improve the utilization efficiency of straw resource. Raw straw... 相似文献
67.
Feng Jingchun Tang YunQing Xue Song Zhang Ke 《Environment, Development and Sustainability》2022,24(1):138-155
Environment, Development and Sustainability - The PPP mode of rural water environment governance was conducive to attracting social capital for giving full play to the decisive role of the market... 相似文献
68.
Environment, Development and Sustainability - Sustainability assessing on agricultural production systems has developed rapidly over the last two decades, and various models are formulated from... 相似文献
69.
Russian Journal of Ecology - The aim of this study is to explore the effects of the litter cover thickness and cleaning methods on seed germination and seedling growth of Pinus densata. The overall... 相似文献
70.
羽序灯心草作为酸性矿山废弃地先锋植物潜力 总被引:1,自引:0,他引:1
生态复垦是当前世界各国酸性矿山废弃地修复的主要方法.通过研究云南来利山锡矿区废弃地土壤pH值、肥力特征及重金属含量,以及矿区生长的羽序灯心草形态特征和植株体内重金属的分布特征,分析植株耐酸性、对废弃地土壤肥力的适应性及对Zn和Cu等重金属污染的耐性,探讨其作为酸性矿山废弃地先锋植物的潜力.结果表明,研究区域根际土壤pH值均值范围为3.46~4.01,呈酸性;土壤中有机质、全钾、全磷和速效磷含量分别为10.28~25.75g·kg~(-1)、 8.84~9.32g·kg~(-1)、 0.56~0.63g·kg~(-1)和1.82~5.72mg·kg~(-1),处于较低水平;土壤中Zn、Cu和Fe含量均值范围分别为54.93~114.49、 92.53~127.59和47 133.60~112 259.63 mg·kg~(-1),其中重金属Cu含量超出风险筛选值1.85~2.55倍;研究区域羽序灯心草株高均值范围为43.77~55.42 cm,对照组植株高度为51.38~57.66 cm,无显著差异,表明羽序灯心草具有耐酸性及对重金属污染具有耐性.进一步分析对重金属Cu和Zn的富集能力和转移特征,发现对Cu和Zn都具有富集能力,且对Zn具有运转能力,具有一定的富集吸收潜力.株高与根际土壤中速效磷的含量显著相关,后期羽序灯心草作为先锋植物在矿山废弃地进行种植时,可针对性地补充含速效磷的肥料改善土壤肥力条件.综合分析结果表明,羽序灯心草作为先锋植物修复酸性矿山废弃地具有巨大潜力. 相似文献