全文获取类型
收费全文 | 1204篇 |
免费 | 74篇 |
国内免费 | 1篇 |
专业分类
林业 | 225篇 |
农学 | 26篇 |
基础科学 | 10篇 |
181篇 | |
综合类 | 89篇 |
农作物 | 26篇 |
水产渔业 | 45篇 |
畜牧兽医 | 546篇 |
园艺 | 24篇 |
植物保护 | 107篇 |
出版年
2021年 | 18篇 |
2020年 | 14篇 |
2019年 | 8篇 |
2018年 | 28篇 |
2017年 | 31篇 |
2016年 | 42篇 |
2015年 | 22篇 |
2014年 | 30篇 |
2013年 | 59篇 |
2012年 | 70篇 |
2011年 | 64篇 |
2010年 | 43篇 |
2009年 | 21篇 |
2008年 | 46篇 |
2007年 | 50篇 |
2006年 | 49篇 |
2005年 | 41篇 |
2004年 | 43篇 |
2003年 | 36篇 |
2002年 | 40篇 |
2001年 | 18篇 |
2000年 | 24篇 |
1999年 | 19篇 |
1998年 | 9篇 |
1992年 | 9篇 |
1991年 | 18篇 |
1990年 | 13篇 |
1989年 | 22篇 |
1988年 | 11篇 |
1987年 | 18篇 |
1986年 | 10篇 |
1985年 | 15篇 |
1984年 | 8篇 |
1983年 | 12篇 |
1982年 | 8篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1975年 | 8篇 |
1974年 | 9篇 |
1973年 | 17篇 |
1972年 | 15篇 |
1971年 | 13篇 |
1970年 | 12篇 |
1969年 | 12篇 |
1968年 | 8篇 |
1967年 | 12篇 |
1931年 | 8篇 |
1930年 | 9篇 |
1929年 | 28篇 |
1926年 | 11篇 |
排序方式: 共有1279条查询结果,搜索用时 15 毫秒
1.
Foltête Jean-Christophe Savary Paul Clauzel Céline Bourgeois Marc Girardet Xavier Sahraoui Yohan Vuidel Gilles Garnier Stéphane 《Landscape Ecology》2020,35(5):1053-1053
Landscape Ecology - In the original publication of the article, the sixth author name has been misspelt. The correct name is given in this Correction. The original article has been corrected. 相似文献
2.
Geographic variation in host fish use and larval metamorphosis for the endangered dwarf wedgemussel 下载免费PDF全文
Barbara St. John White C. Paola Ferreri William A. Lellis Barry J. Wicklow Jeffrey C. Cole 《水产资源保护:海洋与淡水生态系统》2017,27(5):909-918
- Host fishes play a crucial role in survival and dispersal of freshwater mussels (Unionoida), particularly rare unionids at conservation risk. Intraspecific variation in host use is not well understood for many mussels, including the endangered dwarf wedgemussel (Alasmidonta heterodon) in the USA.
- Host suitability of 33 fish species for dwarf wedgemussel glochidia (larvae) from the Delaware and Connecticut river basins was tested in laboratory experiments over 9 years. Relative suitability of three different populations of a single host fish, the tessellated darter (Etheostoma olmstedi), from locations in the Connecticut, Delaware, and Susquehanna river basins, was also tested.
- Connecticut River basin A. heterodon metamorphosed into juvenile mussels on tessellated darter, slimy sculpin (Cottus cognatus), and Atlantic salmon (Salmo salar) parr. Delaware River basin mussels metamorphosed using these three species, as well as brown trout (Salmo trutta), banded killifish (Fundulus diaphanus), mottled sculpin (Cottus bairdii), striped bass (Morone saxatilis), and shield darter (Percina peltata). Atlantic salmon, striped bass, and sculpins were highly effective hosts, frequently generating 5+ juveniles per fish (JPF) and metamorphosis success (MS; proportion of attaching larvae that successfully metamorphose) ≥ 0.4, and producing juveniles in repeated trials.
- In experiments on tessellated darters, mean JPF and MS values decreased as isolation between the mussel source (Connecticut River) and each fish source increased; mean JPF = 10.45, 6.85, 4.14, and mean MS = 0.50, 0.41, and 0.34 in Connecticut, Delaware, and Susquehanna river darters, respectively. Host suitability of individual darters was highly variable (JPF = 2–11; MS = 0.20–1.0).
- The results show that mussel–host fish compatibility in A. heterodon differs among Atlantic coastal rivers, and suggest that hosts including anadromous Atlantic salmon and striped bass may help sustain A. heterodon in parts of its range. Continued examination of host use variation, migratory host roles, and mussel–fish interactions in the wild is critical in conservation of A. heterodon and other vulnerable mussel species.
3.
Cyprinid herpesvirus 3 as a potential biological control agent for carp (Cyprinus carpio) in Australia: susceptibility of non‐target species 下载免费PDF全文
K A McColl A Sunarto J Slater K Bell M Asmus W Fulton K Hall P Brown D Gilligan J Hoad L M Williams M St J Crane 《Journal of fish diseases》2017,40(9):1141-1153
Carp (Cyprinus carpio L.) is a pest species in Australian waterways, and cyprinid herpesvirus 3 (CyHV‐3) is being considered as a potential biological control (biocontrol) agent. An important consideration for any such agent is its target specificity. In this study, the susceptibility to CyHV‐3 of a range of non‐target species (NTS) was tested. The NTS were as follows: 13 native Australian, and one introduced, fish species; a lamprey species; a crustacean; two native amphibian species (tadpole and mature stages); two native reptilian species; chickens; and laboratory mice. Animals were exposed to 100–1000 times the approximate minimum amount of CyHV‐3 required to cause disease in carp by intraperitoneal and/or bath challenge, and then examined clinically each day over the course of 28 days post‐challenge. There were no clinical signs, mortalities or histological evidence consistent with a viral infection in a wide taxonomic range of NTS. Furthermore, there was no molecular evidence of infection with CyHV‐3, and, in particular, all RT‐PCRs for viral mRNA were negative. As a consequence, the results encourage further investigation of CyHV‐3 as a potential biocontrol agent that is specific for carp. 相似文献
4.
Nicholas A Lyons Neal Alexander Katharina DC St?rk Thomas D Dulu Jonathan Rushton Paul EM Fine 《Veterinary research》2015,46(1)
Foot and mouth disease (FMD) is a highly transmissible viral infection of cloven hooved animals associated with severe economic losses when introduced into FMD-free countries. Information on the impact of the disease in FMDV-endemic countries is poorly characterised yet essential for the prioritisation of scarce resources for disease control programmes. A FMD (virus serotype SAT2) outbreak on a large-scale dairy farm in Nakuru County, Kenya provided an opportunity to evaluate the impact of FMD on clinical mastitis and culling rate. A cohort approach followed animals over a 12-month period after the commencement of the outbreak. For culling, all animals were included; for mastitis, those over 18 months of age. FMD was recorded in 400/644 cattle over a 29-day period. During the follow-up period 76 animals were culled or died whilst in the over 18 month old cohort 63 developed clinical mastitis. Hazard ratios (HR) were generated using Cox regression accounting for non-proportional hazards by inclusion of time-varying effects. Univariable analysis showed FMD cases were culled sooner but there was no effect on clinical mastitis. After adjusting for possible confounders and inclusion of time-varying effects there was weak evidence to support an effect of FMD on culling (HR = 1.7, 95% confidence intervals [CI] 0.88-3.1, P = 0.12). For mastitis, there was stronger evidence of an increased rate in the first month after the onset of the outbreak (HR = 2.9, 95%CI 0.97-8.9, P = 0.057).
Electronic supplementary material
The online version of this article (doi:10.1186/s13567-015-0173-4) contains supplementary material, which is available to authorized users. 相似文献5.
6.
7.
8.
Agronomic traits of soybean cultivars released in different decades after grafting record‐yield cultivar as rootstock 下载免费PDF全文
Shengyou Li Fei Teng Demin Rao Xingdong Yao Huijun Zhang Haiying Wang Shuhong Song Steven K. St. Martin Futi Xie 《Plant Breeding》2017,136(2):133-138
Breeders have seldom considered the selection for root traits during the genetic improvement in soybean. It is hypothesized that grain yield would be increased by the root function improvement, especially for the current cultivars. The objective of this grafting experiment was to determine the effect of record‐yield cultivars L14 or Z35 as rootstocks on agronomic traits of cultivars released in different decades. A total of 11 cultivars, released in different decades, were used to graft onto L14 or Z35 rootstocks. The agronomic traits were measured in the pot‐culture experiments. Grafting cultivars released in different decades onto L14 or Z35 rootstocks resulted in higher yield, 100‐seed mass and apparent harvest index as compared with those of non‐grafted or self‐grafted plants. Grain yield gain of cultivars grafted onto record‐yield cultivar rootstocks was 0.40 g/plant/year from 1966 to 2006, which was larger than that of non‐grafts and self‐grafts (0.27 g/plant/year). The yield of current cultivars should increase more if their root functions were improved. 相似文献
9.
Marie Le Roux Mathilde Redon Frédéric Archaux Jed Long Stéphane Vincent Sandra Luque 《Landscape Ecology》2017,32(5):1005-1021
Context
Context Bats are considered as an ecological indicator of habitat quality due to their sensitivity to human-induced ecosystem changes. Hence, we will focus the study on two indicator species of bats as a proxy to evaluate structure and composition of the landscape to analyze anthropic pressures driving changes in patterns.Objectives
This study develops a spatially-explicit model to highlight key habitat nodes and corridors which are integral for maintaining functional landscape connectivity for bat movement. We focus on a complex mountain landscape and two bat species: greater (Rhinolophus ferrumequinum) and lesser (Rhinolophus hipposideros) horseshoe bats which are known to be sensitive to landscape composition and configuration.Methods
Species distribution models are used to delineate high-quality foraging habitat for each species using opportunistic ultrasonic bat data. We then performed connectivity analysis combining (modelled) suitable foraging habitat and (known) roost sites. We use graph-theory and the deviation in the probability of connectivity to quantify resilience of the landscape connectivity to perturbations.Results
Both species were confined to lowlands (<1000 m elevation) and avoided areas with high road densities. Greater horseshoe bats were more generalist than lesser horseshoe bats which tended to be associated with broadleaved and mixed forests.Conclusions
The spatially-explicit models obtained were proven crucial for prioritizing foraging habitats, roost sites and key corridors for conservation. Hence, our results are being used by key stakeholders to help integrate conservation measures into forest management and conservation planning at the regional level. The approach used can be integrated into conservation initiatives elsewhere.10.
Goyette Jean-Olivier Cimon-Morin Jérôme Mendes Poliana Thériault Maxime Pellerin Stéphanie Poulin Monique 《Landscape Ecology》2021,36(9):2691-2706
Landscape Ecology - Human activities have led to the degradation of wetlands, impinging on their capacity to deliver essential ecosystem services to society. Wetland restoration now appears an... 相似文献