全文获取类型
收费全文 | 43355篇 |
免费 | 365篇 |
国内免费 | 275篇 |
专业分类
安全科学 | 973篇 |
废物处理 | 2164篇 |
环保管理 | 5863篇 |
综合类 | 6175篇 |
基础理论 | 12238篇 |
环境理论 | 14篇 |
污染及防治 | 10917篇 |
评价与监测 | 3070篇 |
社会与环境 | 2337篇 |
灾害及防治 | 244篇 |
出版年
2022年 | 226篇 |
2021年 | 267篇 |
2019年 | 250篇 |
2018年 | 1789篇 |
2017年 | 1691篇 |
2016年 | 1822篇 |
2015年 | 682篇 |
2014年 | 878篇 |
2013年 | 2838篇 |
2012年 | 1450篇 |
2011年 | 2593篇 |
2010年 | 1772篇 |
2009年 | 1724篇 |
2008年 | 2237篇 |
2007年 | 2643篇 |
2006年 | 1388篇 |
2005年 | 1173篇 |
2004年 | 1197篇 |
2003年 | 1155篇 |
2002年 | 1162篇 |
2001年 | 1358篇 |
2000年 | 1015篇 |
1999年 | 569篇 |
1998年 | 453篇 |
1997年 | 448篇 |
1996年 | 491篇 |
1995年 | 523篇 |
1994年 | 501篇 |
1993年 | 460篇 |
1992年 | 432篇 |
1991年 | 419篇 |
1990年 | 447篇 |
1989年 | 418篇 |
1988年 | 390篇 |
1987年 | 369篇 |
1986年 | 330篇 |
1985年 | 314篇 |
1984年 | 394篇 |
1983年 | 352篇 |
1982年 | 389篇 |
1981年 | 359篇 |
1980年 | 297篇 |
1979年 | 320篇 |
1978年 | 262篇 |
1977年 | 231篇 |
1976年 | 209篇 |
1975年 | 213篇 |
1974年 | 210篇 |
1973年 | 224篇 |
1972年 | 230篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
191.
The pattern of settlement over time of three broadcast spawning coral species (Cyphastrea serailia, Acanthastrea lordhowensis, and Goniastrea australensis) from the Solitary Islands (30°00′S; 153°20′E) was studied in 1995 and 1996 in order to determine the maximum length of time
these larvae could remain in the water column and still retain the ability to settle and metamorphose. Larvae were maintained
in aquaria and the number which had settled on biologically-conditioned tile pairs was monitored every 5 to 10 d. While the
majority of larvae settled quickly after becoming competent, some larvae survived and settled for extended periods after spawning.
Competency periods ranged from 26 d for C. serailia to 56 d for G. australensis and 78 d for A. lordhowensis. These data greatly extend the known competency periods for larvae of broadcast-spawning corals and indicate the potential
for transport of broadcast-spawned coral larvae over large distances. Medium to long-distance larval dispersal of the species
studied provides a mechanism for their widespread distribution in subtropical regions, on reefs which are often widely spaced
and relatively isolated.
Received: 27 May 1997 / Accepted: 27 November 1997 相似文献
192.
Karyotypic characterization of the great sturgeon, Huso huso, by multiple staining techniques and fluorescent in situ hybridization 总被引:1,自引:0,他引:1
F. Fontana J. Tagliavini L. Congiu M. Lanfredi M. Chicca C. Laurente R. Rossi 《Marine Biology》1998,132(3):495-501
A karyotype analysis by several staining techniques was carried out on the great sturgeon, Huso huso (Linnaeus, 1758). The karyotype (2n = 118 ± 2) was composed of 42 pairs of meta-/submetacentric chromosomes and 17 pairs of acrocentrics/microchromosomes. Constitutive
heterochromatin was mainly located at the centromeric regions of the acrocentric chromosomes. The biarmed chromosomes showed
weak C-bands. Fluorescent staining with GC-specific chromomycin A3 showed clearly recognizable fluorescent regions, whereas a more uniform base composition was revealed by the AT-specific
4,6-diamidino-2 phenylindole. After Ag-staining, nucleolar organizer regions could be observed on the short arms of two medium-sized
submetacentrics and on two acrocentrics. Digoxigenated 28S and 5S rDNA probes, prepared from Acipenser naccarii DNA and hybridized to metaphase chromosomes, showed signals on six and two chromosomes, respectively. The telomeric sequence
(TTAGGG)
n
detected by FISH was located at both ends of each chromosome. Results are discussed in relation to karyotype organization
and evolution in sturgeons.
Received: 1 April 1998 / Accepted: 21 July 1998 相似文献
193.
Starch-gel electrophoresis of allozymes was used to differentiate the two red mullet species (Mullus barbatus L. and M. surmuletus L.) in the Mediterranean Sea and, further, to investigate the genetic stock structure of M. barbatus in the eastern Mediterranean area. Twenty putative enzyme-coding loci were examined in eight M. barbatus samples caught in the Aegean and Ionian Seas (Greece) and in the Gulf of Lion (France), and two M. surmuletus samples caught in the Aegean and Gulf of Lion. A high degree of genetic polymorphism was found in both species. Species-specific
electrophoretic patterns were found in PGI* and PGM*. Estimates of variance of allele frequencies among samples (F
ST) and 2 analyses both revealed significant differences (P < 0.05) among the M. barbatus samples. Most of the genetic variation was among samples regardless of region. The mean value of Nei's genetic distance between
the two species was 0.329. Genetic distance among M. barbatus samples was low (maximum Nei's D = 0.012), with the sample from Platania differing most from other M. barbatus samples. This is probably be due to founder effects existing at this area. These results suggest that allozyme analysis may
provide important information on the genetic structure of the red mullet to ensure sustainable management of this species.
Received: 7 May 1997 / Accepted: 13 October 1997 相似文献
194.
195.
196.
Major and trace elements of selected pedons in the USA 总被引:6,自引:0,他引:6
Few studies of soil geochemistry over large geographic areas exist, especially studies encompassing data from major pedogenic horizons that evaluate both native concentrations of elements and anthropogenically contaminated soils. In this study, pedons (n = 486) were analyzed for trace (Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Zn) and major (Al, Ca, Fe, K, Mg, Na, P, Si, Ti, Zr) elements, as well as other soil properties. The objectives were to (i) determine the concentration range of selected elements in a variety of U.S. soils with and without known anthropogenic additions, (ii) illustrate the association of elemental source and content by assessing trace elemental content for several selected pedons, and (iii) evaluate relationships among and between elements and other soil properties. Trace element concentrations in the non-anthropogenic dataset (NAD) were in the order Mn > (Zn, Cr, Ni, Cu) > (Pb, Co) > (Cd, Hg), with greatest mean total concentrations for the Andisol order. Geometric means by horizon indicate that trace elements are concentrated in surface and/or B horizons over C horizons. Median values for trace elements are significantly higher in surface horizons of the anthropogenic dataset (AD) over the NAD. Total Al, Fe, cation exchange capacity (CEC), organic C, pH, and clay exhibit significant correlations (0.56, 0.74, 0.50, 0.31, 0.16, and 0.30, respectively) with total trace element concentrations of all horizons of the NAD. Manganese shows the best inter-element correlation (0.33) with these associated total concentrations. Total Fe has one of the strongest relationships, explaining 55 and 30% of the variation in total trace element concentrations for all horizons in the NAD and AD, respectively. 相似文献
197.
Indicators of ecosystem recovery 总被引:6,自引:0,他引:6
198.
Thomas C. Winter 《Journal of the American Water Resources Association》2000,36(2):305-311
ABSTRACT: The vulnerability of wetlands to changes in climate depends on their position within hydrologic landscapes. Hydrologic landscapes are defined by the flow characteristics of ground water and surface water and by the interaction of atmospheric water, surface water, and ground water for any given locality or region. Six general hydrologic landscapes are defined; mountainous, plateau and high plain, broad basins of interior drainage, riverine, flat coastal, and hummocky glacial and dune. Assessment of these landscapes indicate that the vulnerability of all wetlands to climate change fall between two extremes: those dependent primarily on precipitation for their water supply are highly vulnerable, and those dependent primarily on discharge from regional ground water flow systems are the least vulnerable, because of the great buffering capacity of large ground water flow systems to climate change. 相似文献
199.
Spatiotemporal variability of wet atmospheric nitrogen deposition to the Neuse River Estuary, North Carolina 总被引:1,自引:0,他引:1
Excessive nitrogen (N) loading to N-sensitive waters such as the Neuse River estuary (North Carolina) has been shown to promote changes in microbial and algal community composition and function (harmful algal blooms), hypoxia and anoxia, and fish kills. Previous studies have estimated that wet atmospheric deposition of nitrogen (WAD-N), as deposition of dissolved inorganic nitrogen (DIN: NO3-, NH3/NH4+) and dissolved organic nitrogen, may contribute at least 15% of the total externally supplied or "new" N flux to the coastal waters of North Carolina. In a 3-yr study from June 1996 to June 1999, we calculated the weekly wet deposition of inorganic and organic N at eleven sites on a northwest-southeast transect in the watershed. The annual mean total (wet DIN + wet organics) WAD-N flux for the Neuse River watershed was calculated to be 956 mg N/m2/yr (15026 Mg N/yr). Seasonally, the spring (March-May) and summer (June-August) months contain the highest total weekly N deposition; this pattern appears to be driven by N concentration in precipitation. There is also spatial variability in WAD-N deposition; in general, the upper portion of the watershed receives the lowest annual deposition and the middle portion of the watershed receives the highest deposition. Based on a range of watershed N retention and in-stream riverine processing values, we estimate that this flux contributes approximately 24% of the total "new" N flux to the estuary. 相似文献
200.