全文获取类型
收费全文 | 498篇 |
免费 | 17篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 18篇 |
废物处理 | 8篇 |
环保管理 | 105篇 |
综合类 | 82篇 |
基础理论 | 126篇 |
环境理论 | 1篇 |
污染及防治 | 123篇 |
评价与监测 | 26篇 |
社会与环境 | 36篇 |
灾害及防治 | 5篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 14篇 |
2021年 | 13篇 |
2020年 | 9篇 |
2019年 | 10篇 |
2018年 | 23篇 |
2017年 | 23篇 |
2016年 | 30篇 |
2015年 | 24篇 |
2014年 | 25篇 |
2013年 | 47篇 |
2012年 | 30篇 |
2011年 | 44篇 |
2010年 | 21篇 |
2009年 | 18篇 |
2008年 | 28篇 |
2007年 | 19篇 |
2006年 | 21篇 |
2005年 | 17篇 |
2004年 | 15篇 |
2003年 | 13篇 |
2002年 | 12篇 |
2001年 | 11篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1966年 | 1篇 |
1963年 | 2篇 |
1942年 | 1篇 |
排序方式: 共有530条查询结果,搜索用时 0 毫秒
121.
Life history trade-offs in tropical trees and lianas 总被引:1,自引:0,他引:1
It has been hypothesized that tropical trees partition forest light environments through a life history trade-off between juvenile growth and survival; however, the generality of this trade-off across life stages and functional groups has been questioned. We quantified trade-offs between growth and survival for trees and lianas on Barro Colorado Island (BCI), Panama using first-year seedlings of 22 liana and 31 tree species and saplings (10 mm < dbh < 39 mm) of 30 tree species. Lianas showed trade-offs similar to those of trees, with both groups exhibiting broadly overlapping ranges in survival and relative growth rates as seedlings. Life history strategies at the seedling stage were highly correlated with those at the sapling stage among tree species, with all species showing an increase in survival with size. Only one of 30 tree species demonstrated a statistically significant ontogenetic shift, having a relatively lower survival rate at the sapling stage than expected. Our results indicate that similar life history trade-offs apply across two functional groups (lianas and trees), and that life history strategies are largely conserved across seedling and sapling life-stages for most tropical tree species. 相似文献
122.
Asiedu Benjamin Ampomah Gyamfi Bright A. Oteng Evans 《Environmental science and pollution research international》2021,28(36):49949-49957
Environmental Science and Pollution Research - Due to various environmental degradation and natural resource depletion around the world, researchers’ and policymakers’ attention has... 相似文献
123.
124.
125.
Benjamin Pauget Frédéric Gimbert Mickael Coeurdassier Coline Druart Nadia Crini Annette de Vaufleury 《Environmental science and pollution research international》2016,23(4):2987-2996
To better understand the fate of metals in the environment, numerous parameters must be studied, such as the soil properties and the different sources of contamination for the organisms. Among bioindicators of soil quality, the garden snail (Cantareus aspersus) integrates multiple sources (e.g. soil, plant) and routes (e.g. digestive, cutaneous) of contamination. However, the contribution of each source on metal bioavailability and how soil properties influence these contributions have never been studied when considering the dynamic process of bioavailability. Using accumulation kinetics, this study showed that the main assimilation source of Cd was lettuce (68 %), whereas the main source of Pb was the soil (90 %). The plant contribution increased in response to a 2-unit soil pH decrease. Unexpectedly, an increase in the soil contribution to metal assimilation accompanied an increase in the organic matter (OM) content of the soil. For both metals, no significant excretion and influence of source on excretion have been modelled either during exposure or depuration. This study highlights how the contribution of different sources to metal bioavailability changes based on changes in soil parameters, such as pH and OM, and the complexity of the processes that modulate metal bioavailability. 相似文献
126.
Benjamin C. McLellan Ross P. Williams Janine Lay Arie van Riessen Glen D. Corder 《Journal of Cleaner Production》2011,19(9-10):1080-1090
Geopolymer concrete is seen as a potential alternative to standard concrete, and an opportunity to convert a variety of waste streams into useful by-products. One key driver in geopolymer development is the desire to reduce greenhouse gas emissions from the production of concrete products. This paper presents an examination of the lifecycle cost and carbon impacts of Ordinary Portland Cement (OPC) and geopolymers in an Australian context, with an identification of some key challenges for geopolymer development. The results of the examination show that there is wide variation in the calculated financial and environmental “cost” of geopolymers, which can be beneficial or detrimental depending on the source location, the energy source and the mode of transport. Some case study geopolymer concrete mixes based on typical Australian feedstocks indicate potential for a 44–64% reduction in greenhouse gas emissions while the financial costs are 7% lower to 39% higher compared with OPC. 相似文献
127.
128.
129.
130.
David W. York Benjamin C. Dysart Lawrence W. Gahan 《Journal of the American Water Resources Association》1977,13(2):283-298
ABSTRACT: The previous paper in this two-part series presented the basic information of a newly developed mathematical model of multiple-use in natural areas. The model is a unified system for the assessment of cases where development is proposed for relatively natural areas. This paper presents the results of an application of the model to a study of the proposed timber harvest in the Great Santec Swamp in South Carolina. This was done in an effort to demonstrate the utility of the model as a planning and assessment tool. Four potential uses of the Swamp were investigated: logging of hardwood saw timber, hunting, fishing, and nature observation. The model system proved to be extremely useful in the evaluation of potential management schemes and in the selection of the most promising or optimal management plan. 相似文献