全文获取类型
收费全文 | 10128篇 |
免费 | 711篇 |
国内免费 | 50篇 |
专业分类
林业 | 655篇 |
农学 | 492篇 |
基础科学 | 85篇 |
1771篇 | |
综合类 | 669篇 |
农作物 | 543篇 |
水产渔业 | 883篇 |
畜牧兽医 | 4678篇 |
园艺 | 166篇 |
植物保护 | 947篇 |
出版年
2023年 | 90篇 |
2022年 | 187篇 |
2021年 | 319篇 |
2020年 | 335篇 |
2019年 | 392篇 |
2018年 | 379篇 |
2017年 | 399篇 |
2016年 | 400篇 |
2015年 | 272篇 |
2014年 | 379篇 |
2013年 | 596篇 |
2012年 | 611篇 |
2011年 | 658篇 |
2010年 | 329篇 |
2009年 | 370篇 |
2008年 | 515篇 |
2007年 | 500篇 |
2006年 | 431篇 |
2005年 | 392篇 |
2004年 | 365篇 |
2003年 | 328篇 |
2002年 | 362篇 |
2001年 | 272篇 |
2000年 | 271篇 |
1999年 | 219篇 |
1998年 | 71篇 |
1997年 | 64篇 |
1996年 | 68篇 |
1995年 | 59篇 |
1994年 | 42篇 |
1993年 | 39篇 |
1992年 | 85篇 |
1991年 | 56篇 |
1990年 | 66篇 |
1989年 | 73篇 |
1988年 | 67篇 |
1987年 | 53篇 |
1986年 | 48篇 |
1985年 | 61篇 |
1984年 | 42篇 |
1983年 | 46篇 |
1982年 | 31篇 |
1980年 | 27篇 |
1979年 | 39篇 |
1978年 | 22篇 |
1977年 | 23篇 |
1974年 | 23篇 |
1973年 | 27篇 |
1972年 | 25篇 |
1970年 | 28篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
C.M. Morvillo E.B. de la Fuente A. Gil M.A. Martínez-Ghersa J.L. González-Andújar 《European Journal of Agronomy》2011,34(4):211-221
Annual wormwood interference on soybean crop growth and yield may result from competition and allelopathy, which are modulated by crop management. Allelochemicals released by annual wormwood (e.g. artemisinin) may affect the crop directly or indirectly through the effect on the nitrogen fixing symbiont, Bradyrhizobium japonicum. The objectives were (i) to quantify the crop response (i.e. biomass production, nodulation and yield) to weed interference and (ii) to determinate the relative change of competition and allelopathy interferences, when a sublethal dose of herbicide is applied. Two split plot field experiments with three replications were used. The experiment involved a factorial combination of five weed–crop density (soybean/annual wormwood, plants m?2) levels: D1, pure soybean, 40/0 plants m?2; D2, 40/2 plants m?2; D3, 40/4 plants m?2 and D4, 40/8 plants m?2, and D5, pure annual wormwood, 0/8 plants m?2, two activated carbon (allelopathy) levels: C?, with activated carbon (reduced allelopathy) and C+, non activated carbon applied (with allelopathy) and two herbicide levels: H?, untreated and H+, treated with a sub-lethal dose of glyphosate. Activated carbon to adsorb allelochemicals (with and without activated carbon) and glyphosate application (with and no herbicide) were assigned to sub-plots. Increasing weed density did not affect crop biomass at flowering, but changed nodule number and soybean yield with a different pattern depending on carbon and herbicide treatment. Relative crop yield decreased with increasing relative weed biomass. This decrease was particularly drastic when allelopathy was reduced by activated carbon and without herbicide application. The maximum yield losses of 33% in 2006 and 17% in 2007 were observed with the highest weed density (8 plants m?2). In contrast, without carbon (high allelopathy level), soybean yield remained stable within the explored range of annual wormwood biomass, despite the fact that weed biomass at high densities (D4) was high enough to generate competition. The lack of response to increasing weed density could be related to the indirect effect of allelochemicals interacting with soil microorganisms (i.e. B. japonicum) that positively affected the nodulation (e.g. larger nodules in 2006 and increased nodules biomass due to higher number of roots in 2007 at high densities). With herbicide application, soybean yield of both carbon treatments remained stable when biomass of annual wormwood increased. This research provided strong evidence in support of the existence of positive effect of allelopathic and competitive interactions between annual wormwood and soybean crop under field conditions that may be overridden under herbicide application. 相似文献
12.
Garosi LS Rossmeisl JH de Lahunta A Shelton GD Lennox G 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2005,19(4):606-609
Two Great Danes were presented for an investigation of 6-month histories of incessant tremor of all 4 limbs and trunk occurring only when the dogs were standing at rest. Dog 1 was a 2-year-old intact female harlequin Great Dane living in the UK, and dog 2 was a 2-year-old castrated male fawn Great Dane living in the United States. The owners described both dogs as having constant quivering of the limbs while standing, suggestive of an involuntary dance, since the age of 18 months. The intensity of the tremors was reported in both dogs to have steadily increased since onset. In dog 1, tremors were noticed to be more pronounced in the fore limbs when she was eating and more pronounced in the hind limbs when she was trying to sit. The owner of dog 1 also reported that the dog could no longer assume a position of recumbency without manual assistance because of the severity of the tremors. Intermittently, tremors were reported to involve the facial musculature of dog 2. Vaccinations were current, and the owners of both dogs did not report any previous medical history, exposure to natural or manufactured toxins, or concurrent treatment. No familial relationship was identified between these 2 dogs. 相似文献
13.
14.
15.
16.
Estimates of forest biomass in the Brazilian Amazon: New allometric equations and adjustments to biomass from wood-volume inventories 总被引:1,自引:0,他引:1
Euler Melo Nogueira Philip Martin Fearnside Bruce Walker Nelson Reinaldo Imbrozio Barbosa Edwin Willem Hermanus Keizer 《Forest Ecology and Management》2008
Uncertainties in biomass estimates in Amazonian forests result in a broad range of possible magnitude for the emissions of carbon from deforestation and other land-use changes. This paper presents biomass equations developed from trees directly weighed in open forest on fertile soils in the southern Amazon (SA) and allometric equations for bole-volume estimates of trees in both dense and open forests. The equations were used to improve the commonly used biomass models based on large-scale wood-volume inventories carried out in Amazonian forest. The biomass estimates from the SA allometric equation indicate that equations developed in forests on infertile soils in central Amazonia (CA) result in overestimates if applied to trees in the open forests of SA. All aboveground components of 267 trees in open forests of SA were cut and weighed, and the proportion of the biomass stored in the crowns of trees in open forest was found to be higher than in dense forest. In the case of inventoried wood volume, corrections were applied for indentations and hollow trunks and it was determined that no adjustment is needed for the form factor used in the RadamBrasil volume formula. New values are suggested for use in models to convert wood volume to biomass estimates. A biomass map for Brazilian Amazonia was produced from 2702 plots inventoried by the RadamBrasil Project incorporating all corrections for wood density and wood volume and in factors used to add the bole volume of small trees and the crown biomass. Considering all adjustments, the biomass map indicates total biomass of 123.1 Gt (1 Gt = 1 billion tons) dry weight (aboveground + belowground) for originally forested areas in 1976 in the Brazilian Legal Amazon as a whole (102.3 Gt for aboveground only) at the time of the RadamBrasil inventories, which were carried out before intensive deforestation had occurred in the region. Excluded from this estimate are 529,000 km2 of forest lacking sufficient RadamBrasil inventory data. After forest losses of 676,000 km2 by 2006 – not counting 175,000 km2 of this deforested area lacking RadamBrasil data – the estimated dry biomass stock was reduced to 105.4 and 87.6 Gt (aboveground + belowground and only above-ground). Thus, in 2006 the carbon storage in forested areas in Brazilian Amazonia as a whole will be around 51.1 Gt (assuming 1 Mg dry biomass = 0.485 Mg C). Biomass estimates by forest type (aggregated into 12 vegetation classes) are provided for each state in the Brazilian Legal Amazon. 相似文献
17.
Leucocyte profile and growth rates as indicators of crowding stress in pejerrey fingerlings (Odontesthes bonariensis) 下载免费PDF全文
Yuri Dornelles Zebral Bruna Zafalon‐Silva Mabel Wiegand Mascarenhas Ricardo Berteaux Robaldo 《Aquaculture Research》2015,46(9):2270-2276
Crowding is one of the most common stressors found in intensive aquaculture, compromising growth rates and immune function. Plasmatic cortisol is a classic stress biomarker for fish, but its quantification is expensive and demands blood volumes that small individuals do not provide, constraining the usage of this technique to assess stress in fingerlings. The leucocyte profile is an alternative methodology to quantify stress with reduced costs and volumes of blood. Stress conditions promote neutrophilia and lymphocytopenia as response to elevated glucocorticoids levels. Considering the difficulties to assess stress imposed by intensive fish farming using measurement of glucocorticoid hormones, this study aimed to evaluate the stress‐induced changes in leucocyte profiles and growth rates imposed by crowding in fingerlings of Odontesthes bonariensis, a promising South‐American candidate for freshwater aquaculture. To meet these objectives, fingerlings (initial weight 0.05 ± 0.06 g and length 1.68 ± 0.13 cm) were reared for 45 days under three rearing densities (1, 5 and 10 fingerlings L?1). At the end of this period, fish were anaesthetized and euthanized to obtain the leucocyte profile, neutrophil:lymphocyte ratio (N:L) and growth rate. Increasing density promoted: significant reduction in growth (final length, weight and specific growth rate); neutrophilia and lymphocytopenia; and increased N:L ratio. Concluding, the tested rearing densities imposed distinct levels of stress characterized by different N:L ratio, demonstrating that the leucocyte profile is a reliable alternative to measure stress levels in O. bonariensis fingerlings and probably in other fish species. 相似文献
18.
F Bernard R Furneaux C Adrega Da Silva J-F Bardet 《Veterinary and comparative orthopaedics and traumatology》2008,21(1):64-68
rhBMP-2 solution on a collagen sponge was placed along the diaphysis of an atrophicradius, which had a history of recurring fractures. Two months after rhBMP-2 treatment, new mineralized bone was present, which significantly increased the diameter of the radius and allowed the removal of the external skeletal fixator (ESF). Due to carpo-metacarpal joint compromise, a pancarpal arthrodesis was performed seven months later. At follow-up evaluation two years later the dog was only very mildly lame. 相似文献
19.
Peters JW de Boer B Broeze-ten Voorde G Broeze J Wiemer P Sterk T Spoormakers T 《Tijdschrift voor diergeneeskunde》2008,133(7):272-278
Prevalence of dental disorders in 483 horses and ponies Five equine veterinarians working at three equine referral hospitals examined the oral cavity of 483 horses and ponies prior to surgery, to gain information about the prevalence of common dental disorders in the horse. A thorough examination, using hands/fingers, a full-mouth speculum, a dental mirror and a good light source, is essential to detect such disorders. Many horses examined needed dental attention even though there were no problems with mastication or riding. The most detected abnormalities were sharp enamel points on the buccal side of the upper arcade and the lingual side of the lower arcade, and hooks at 106/206 and 311/411. Regular dental care would improve the condition and welfare of horses. 相似文献
20.
Derossi R Medeiros U de Almeida RG Righetto FR Frazílio FO 《Veterinary journal (London, England : 1997)》2008,178(2):294-297
The aim of the study was to evaluate and compare the effects of caudal epidural administration of meperidine (MP), lidocaine (LD), and a combination of the two (MPLD) in six mature saddle horses. Horses were randomly assigned to receive three treatments (MP 0.3 mg/kg; LD 0.2 mg/kg; and MPLD: MP 0.3 mg/kg and LD 0.2 mg/kg), with at least 1 week between treatments. Drugs were injected into the epidural space between the first and second coccygeal areas in conscious standing horses. Analgesia, ataxia, sedation, cardiovascular and respiratory effects, and rectal temperature were recorded at different intervals before (baseline) and after administration. Epidural administration of MPLD resulted in a longer duration of analgesia of the tail, perineum, and upper hind limb regions than did administration of MP or LD alone. 相似文献