全文获取类型
收费全文 | 1499篇 |
免费 | 48篇 |
国内免费 | 23篇 |
专业分类
安全科学 | 61篇 |
废物处理 | 65篇 |
环保管理 | 335篇 |
综合类 | 125篇 |
基础理论 | 474篇 |
环境理论 | 4篇 |
污染及防治 | 297篇 |
评价与监测 | 106篇 |
社会与环境 | 83篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 11篇 |
2022年 | 25篇 |
2021年 | 33篇 |
2020年 | 26篇 |
2019年 | 30篇 |
2018年 | 38篇 |
2017年 | 52篇 |
2016年 | 54篇 |
2015年 | 51篇 |
2014年 | 53篇 |
2013年 | 128篇 |
2012年 | 71篇 |
2011年 | 120篇 |
2010年 | 71篇 |
2009年 | 88篇 |
2008年 | 104篇 |
2007年 | 96篇 |
2006年 | 78篇 |
2005年 | 57篇 |
2004年 | 58篇 |
2003年 | 53篇 |
2002年 | 35篇 |
2001年 | 18篇 |
2000年 | 14篇 |
1999年 | 19篇 |
1998年 | 15篇 |
1997年 | 14篇 |
1996年 | 18篇 |
1995年 | 13篇 |
1994年 | 18篇 |
1993年 | 13篇 |
1992年 | 15篇 |
1991年 | 8篇 |
1990年 | 5篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1978年 | 4篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1959年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有1570条查询结果,搜索用时 15 毫秒
271.
272.
Future Taxonomic Partnerships: Reply to Goldstein 总被引:1,自引:0,他引:1
273.
Nicholas Andrew Robinson 《Conservation biology》1995,9(1):114-125
On mainland Australia, the eastern barred bandicoot, Perameles gunnii , is confined to a relic wild population numbering less than 100 individuals in the city of Hamilton. Animals derived from this population are being bred in captivity in order to promote their recovery. The species also exists in Tasmania, where tittle is known of its conservation and taxonomic status. Mitochondrial DNA variability was compared within and between populations of P. gunnii using restriction fragment length polymorphisms. Genetic variability was found to be high among P. gunnii in Hamilton compared to those in Tasmania (higher diversity index, nucleotide sequence divergence, and greater number of haplotypes), despite the known decline and subdivision of the Hamilton population. Restriction fragment length polymorphisms distinguished animals from the east and the west of Hamilton and from the north and south of Tasmania. Nucleotide sequence divergence was substantial (2.2–2.5%) between Hamilton and Tasmania. Implications are that captive breeding and reintroduction should be designed to genetically represent the structure within Hamilton in order to minimize inbreeding and that the introduction of Tasmanian P. gunnii would not benefit the Hamilton population. It is concluded that mitochondrial DNA markers clearly can provide useful information about the history and current status of endangered marsupial populations, to the benefit of conservation management. 相似文献
274.
275.
276.
Coal companies are reluctant to include wetland development in reclamation plans partly due to a lack of information on the
resulting characteristics of such sites. It is easier for coal companies to recreate terrestrial habitats than to attempt
experimental methods and possibly face significant regulatory disapproval. Therefore, we studied a young (10 years) wetland
on a reclaimed surface coal mine in southern Illinois so as to ascertain soil and water characteristics such that the site
might serve as a model for wetland development on surface mines. Water pH was not measured because of equipment problems,
but evidence (plant life, fish, herpetofauna) suggests suitable pH levels. Other water parameters (conductivity, salinity,
alkalinity, chloride, copper, total hardness, iron, manganese, nitrate, nitrite, phosphate, and sulfate) were measured, and
only copper was seen in potentially high concentrations (but with no obvious toxic effects). Soil variables measured included
pH, nitrate, nitrite, ammonia, potassium, calcium, magnesium, manganese, aluminum, iron, sulfate, chloride, and percent organic
matter. Soils were slightly alkaline and most parameters fell within levels reported for other studies on both natural and
manmade wetlands. Aluminum was high, but this might be indicative more of large amounts complexed with soils and therefore
unavailable, than amounts actually accessible to plants. Organic matter was moderate, somewhat surprising given the age of
the system. 相似文献
277.
278.
Precopulatory sexual cannibalism (predation of a potential mate prior to copulation) offers an extreme example of intersexual conflict, a current focus in behavioral ecology. The aggressive-spillover hypothesis, posits that precopulatory sexual cannibalism may be a nonadaptive by-product of a general syndrome of voracity (aggression towards prey) that is expressed in multiple behavioral contexts. In this view, selection favoring high levels of voracity throughout ontogeny spills over to cause sexual cannibalism in adult females even when it is not necessarily beneficial. Using the North American fishing spider, Dolomedes triton, we present the first in depth test of this hypothesis. We found support for three aspects of the spillover hypothesis. First, voracity towards hetero-specific prey results in high feeding rates, large adult size, and increased fecundity. Second, juvenile and adult voracity are positively correlated (i.e., voracity is a consistent trait over ontogeny). Third, voracity towards hetero-specific prey is indeed positively correlated with precopulatory sexual cannibalism. Assays of antipredator behavior further revealed positive correlations between boldness towards predators, voracity and precopulatory sexual cannibalism. Overall, our results support the notion that precopulatory sexual cannibalism in D. triton is part of a behavioral syndrome spanning at least three major contexts: foraging, predator avoidance, and mating. 相似文献
279.
280.
John Humphreys Richard W. G. Caldow Selwyn McGrorty Andrew D. West Antony C. Jensen 《Marine Biology》2007,151(6):2255-2270
The Manila clam Ruditapes philippinarum was introduced to Poole Harbour (lat 50°N) on the south coast of England in 1988 as a novel species for aquaculture. Contrary
to expectations, this species naturalised. We report on individual growth patterns, recruitment, mortality and production
within this population. On the intertidal mudflats the abundance of clams (>5 mm in length) varied seasonally between 18 and
56 individuals m−2. There appear to be two recruitment events per year and there were 6 year classes in the population. A mid-summer decline
in abundance was partly due to increased mortality but probably also a result of down-shore migration in response to high
water temperatures and the development of anoxic conditions. A winter fishery removes c 75% of clams of fishable size (maximum
shell length ≥40 mm) and c 20% of the annual production. The fishery depresses the maximum age and size attained by the clams
but appears to be sustainable. Clam mortality due to factors other than fishing is highest in late-winter to early spring.
The growth of the clams is intermediate in comparison with many published studies but remarkably good given their intertidal
position. As on the coasts of the Adriatic Sea, where the clam is also non-native, the Manila clam has thrived in a shallow,
eutrophic, lagoon-like system on the English coast. While the Poole Harbour population is currently Europe’s most northerly
reported self-sustaining, naturalised population, given forecasts of increasing air and sea temperatures it might be expected
that this species will eventually spread to more sites around the coasts of Northern Europe with associated economic and ecological
consequences. 相似文献