全文获取类型
收费全文 | 26226篇 |
免费 | 755篇 |
国内免费 | 15篇 |
专业分类
林业 | 4292篇 |
农学 | 1617篇 |
基础科学 | 184篇 |
5191篇 | |
综合类 | 1149篇 |
农作物 | 2671篇 |
水产渔业 | 2803篇 |
畜牧兽医 | 5178篇 |
园艺 | 1277篇 |
植物保护 | 2634篇 |
出版年
2024年 | 13篇 |
2023年 | 105篇 |
2022年 | 180篇 |
2021年 | 348篇 |
2020年 | 351篇 |
2019年 | 373篇 |
2018年 | 3051篇 |
2017年 | 3043篇 |
2016年 | 1615篇 |
2015年 | 421篇 |
2014年 | 509篇 |
2013年 | 730篇 |
2012年 | 1581篇 |
2011年 | 2849篇 |
2010年 | 2465篇 |
2009年 | 1574篇 |
2008年 | 1890篇 |
2007年 | 2155篇 |
2006年 | 489篇 |
2005年 | 512篇 |
2004年 | 485篇 |
2003年 | 537篇 |
2002年 | 413篇 |
2001年 | 199篇 |
2000年 | 225篇 |
1999年 | 141篇 |
1998年 | 49篇 |
1997年 | 30篇 |
1996年 | 31篇 |
1995年 | 27篇 |
1994年 | 28篇 |
1993年 | 34篇 |
1992年 | 41篇 |
1991年 | 33篇 |
1990年 | 42篇 |
1989年 | 69篇 |
1988年 | 42篇 |
1987年 | 39篇 |
1986年 | 27篇 |
1985年 | 26篇 |
1984年 | 22篇 |
1983年 | 21篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 17篇 |
1977年 | 15篇 |
1976年 | 13篇 |
1972年 | 11篇 |
1968年 | 12篇 |
1966年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Edival Ângelo Valverde Zauza Lúcio Mauro da Silva Guimarães Nilza de Lima Pereira Sales Samuel Alves dos Santos Rafael Ferreira Alfenas Acelino Couto Alfenas 《Forest Pathology》2023,53(2):e12806
An outbreak of a new and severe disease was observed in Eucalyptus plantations of Bahia state, Brazil. An Ascomycota fungus has been frequently associated with the main symptoms of the disease namely leaf spot, branch cankers, shoot blight, defoliation, and dieback. Based on morphological characteristics, phylogenetic analysis (ITS and TEF-1α genes), and pathogenicity test on Eucalyptus plants, Pseudoplagiostoma eucalypti was identified as the causal agent of the disease. Although P. eucalytpi has been known from in Brazil since 1998, this is the first report of it causing severe disease and die-back on Eucalyptus spp. and we also record new symptoms associated with the pathogen. 相似文献
992.
Water relation parameters of bare-root seedlings of Chinese fir (Cunninghamia lanceolata Hook.)and Masson pine (Pinus massoniana Lamb.)were measured and changes of root growth potential as well as field survival rate of both species were studied after the bare-root seedlings were exposed in a sunny field condition.the results showed that masson pine had a lower osmotic potential(-2.07Mpa) at turgor loss point and at full turgor(-1.29Mpa),compared with Chinese fir(-1.80Mpa and -1.08Mpa respectively).The parameter Vp/Vo(63.27%) of Masson pine was higher than that of chinese fir (58.03%).This means that Masson pine has a stronger ability to tolerate desiccation,compared to Chinese fir according to analysis of above water relation parameters.Root growth potential and field survival rate decreased with prolonging duration of exposure.The field survival rate of both species was reduced to less than 40% after the seedling being exposed only two hours.Water potentials of -1.60 Mpa and -1.70 Mpa were suggested to be critical values for Chinese fir and Masson pine respectively in successful reforestation. 相似文献
993.
QINGuanq-hua JIANGYue-zhong QIAOYu-ling B.Nottola 《林业研究》2003,14(3):225-229
Poplar is one of the dominant tree species for the establishment of fast growing plantations in Shandong Province.Eighteen poplar clones belonging to Populus aigeiros section were introduced from Italy, Turkey and domestic regions. Populus deltoides cv. ‘Lux‘ 1-69/55 (1-69), which was widely used in Shandong Province, China, was taken as control clone (1-69).Following a randomized complete block design, seedling test and controlled afforestation trials were carried out at Juxian County,Caoxian County and Laiyang City. The results showed that the poplar clone (Populus x euramericana cv. ‘102/74‘), namely 102/74, performed well both in terms of adaptability and growth rate. The mean height of 13.9 m (H), diameter at breast height of 18.0 cm (DBH) and volume growth of 0.1445 m3 (V) were 2.2 %, 21.6% and 52.9% higher than those of 1-69 (CK), respectively,at the age of 5 years at three experimental sites. Moreover, the clone can be propagated easily and showed high resistance to poplar disease, pest as well as salinity and had longer growing period. Furthermore, wood basic density and fiber length of new poplar clone (102/74) were as same as 1-69 (CK). It was concluded that the selected clone (102/74) was ideal for the estab-lishment of fast-growing poplar plantations, especially for the pulpwood plantations in Shandong Province. 相似文献
994.
Effect of temperature and compression on the mechanical behavior of steam-treated wood 总被引:2,自引:0,他引:2
The mechanical behavior of steamed spruce wood changes dramatically with compression along the grain, the change being much more moderate perpendicular to the grain. The stiffness decrement due to increased temperature is greatest in the tangential material direction. The stiffness decrement due to compression is greatest along the grain. Compression to 80% compressive strain at 131°C inverts the order of the material directions regarding stiffness, the stiffness being the least along the grain. Plastic strain due to compression is greater at higher temperatures. The compression-induced decrement of stiffness along the grain is greater at higher temperatures, but the off-axis decrement of stiffness is less at higher temperatures. 相似文献
995.
This paper describes the use by family forest landowners of educational programs provided by Washington State University Cooperative
Extension (WSUCE), and the associated use of technical assistance programs provided by state and federal agencies and the
private sector. Approximately 100,000 family forest owners controlled 19% or over 1.2 M ha of Washington’s forestland and
accounted for 29% of the timber harvested in the state on a volume basis in 1998. A variety of public and private assistance
and education programs are available to encourage and help family forest owners manage their forests. In 1999 a mail survey
was conducted to evaluate use and effectiveness of Washington’s family forest assistance and education programs. Over half
of the 872 responding family forest landowners had contact with an extension educator, program or educational material, and
about three quarters of these respondents gave an overall rating of the usefulness of extension programs and materials as
good or excellent. Respondents attending WSUCE forestry educational programs have larger median land ownership size, are older,
have owned their forests longer, have a higher rate of absentee ownership, and are better educated than non-users. They are
more likely to actively manage their forests for timber production and exhibit a clearer understanding of the multiple-use
capabilities of their forests. 相似文献
996.
A study was conducted with the objective of obtaining a profile of farmers who have participated in the Farm Partnership Scheme
in Ireland. This scheme is a joint venture between Coillte (The Irish Forestry Board) and farmers. Under the terms of the
scheme, Coillte is responsible for the establishment, management and harvesting of the forest plantation on the farmer’s land.
The farmer retains ownership of the land, receives premium payments and shares in the harvesting profits. Fifty farmers who
joined the Farm Partnership Scheme between 1993–1997 were interviewed in 1999 and a detailed questionnaire was completed.
Survey results indicate that the typical farm partner was male, married and aged 50 years or older. Over half of those surveyed
had an off-farm job. The most popular reason for farmers opting to participate in the Farm Partnership Scheme was that they
did not have sufficient time to undertake the establishment and management of a forest plantation themselves. The average
size of forest established under the scheme was 23.7 ha, with Sitka spruce the most popular species planted. The average annual
payment under the scheme was €8077. For 46% of those surveyed, the returns from the Farm Partnership Scheme comprised all
of their farm income. 相似文献
997.
Tree planting for poverty reduction in less-favoured areas of the Ethiopian highlands 总被引:1,自引:0,他引:1
This paper assesses the potential impact of planting of eucalypt trees as a strategy to reduce poverty in a less-favoured
area of the highlands of Ethiopia. Results from simulations with a bio-economic model for a less-favoured case study area
in the highlands are combined with survey data at community, household and plot level to assess how general the results of
the bio-economic model are. Application of the bio-economic model shows clearly that land degradation, population growth,
stagnant technology and drought threaten food security. Household welfare and land quality are deteriorating rapidly in the
area and interventions are urgently needed to avoid human disaster. Planting of eucalypts on land unsuitable for crop production
may substantially increase household incomes if market outlets for trees can be found. Tree planting will not have severe
negative effects on food production or land conservation. A policy combining promotion of tree planting and conservation of
cropland may achieve win-win benefits in terms of increased household incomes as well as more sustainable land-use. Analysis
of survey data from the Amhara Region of Ethiopia reveals that there is a large area of land that is unsuitable for crop production
located close to all-weather roads in the less-favoured areas of the region. Few trees have been planted on this type of land
up to now. The past policy seems to have discouraged tree planting except on homestead plots that are more suitable for food
crops.
This paper reports part of the IFPRI/ILRI project ‘Policies for Sustainable Land Management in the East African Highlands’.
These two agencies have provided funds and logistical support for the work. The Norwegian Ministry of Foreign Affairs has
provided funds for this research in the Amhara Region in Ethiopia. The authors also draw on earlier work funded by Research
Council of Norway. Any correspondence should be directed to the first author. 相似文献
998.
FLORES, the Forest Land Oriented Resource Envisioning System, is a framework to facilitate quantitative modelling of ecological,
economic and social issues at the landscape scale. This issue ofSmall-scale Forest Economics, Management and Policy describes the evolution of FLORES from a concept to a series of models calibrated for diverse locations, and documents the
lessons learned.
The idea to construct and use landscape-scale models of the forest frontier, based on simulating household decisions and land
use at a spatial scale close to the field level, arose from a desire to add rigour to land-use policy research at CIFOR, the
Center for International Forestry Research (Vanclay 1995). This simulation modelling approach to addressing interdisciplinary
issues, where people are strongly interacting with forest resources, became known as FLORES, the Forest Land Oriented Resource
Envisioning System (Vanclay 1998). Muetzelfeldtet al. (1998) constructed a simple prototype of a FLORES model to illustrate the concept and demonstrate the ability of a system-dynamics
modelling environment to animate such a model (Muetzelfeldt and Taylor 1997, 2001, Muetzelfeldt and Massheder 2003). In 1999,
FLORES became a reality, when 50 scientists from diverse disciplines met in Bukittinggi, Indonesia to construct the first
FLORES model styled on this prototype (CIFOR 1999, Vanclayet al. 2003).
The research reported in this special issue was made possible by generous financial support from the Department for International
Development (UK), the European Community, the Asian Development Bank (under RETA 5812) and the Center for International Forestry
Research. The views expressed herein are those of the authors alone. We would like to thank the following people who have
assisted in the production of this special issue by acting as anonymous referees for these and other papers: Andy Warner,
Brendan Moran, Bruno Verbist, Chris Dake, Chris Legg, Doug Sheil, Euan Mason, Francois Bousquet, Frank Vanclay, Geoff Slaughter,
James Gambiza, John Herbohn, John Poulsen, Jungho Suh, Mike Spilsbury, Paul Phillips, Paul van Gardingen, Phil Norman, Philip
Nyhus, Roger Wheate, Ross Sigley, Steve Harrison and Tom Evans. Thanks also to the editorial staff, especially Steve Harrison,
John Herbohn and Jungho Suh, for making this special issue possible. 相似文献
999.
Mandy Haggith Ravi Prabhu Happyson Mudavanhu Frank Matose Tendayi Mutimukuru Richard Nyirenda Wavell Standa-Gunda 《Small-Scale Forestry》2003,2(2):155-169
This paper explores the challenge of defining the scope of a systems model, emphasising three aspects: boundary, granularity
and conceptual scope. The significance of these is illustrated by reference to a model of land-use decisions made in villages
bordering on the Mafungautsi forest in Zimbabwe. The purpose of this model was to help policy players (Forestry Commission
staff, non-governmental organisations, researchers and local people) to understand the impact of policy interventions on local
people’s livelihoods. Scoping decisions that were made in building the Mafungautsi model were deliberately liberal, to encompass
the interests of all participants in the modelling process. These decisions now present a range of serious challenges: the
difficulty of model calibration, the computational expense of running simulations, and the difficulty for new users to understand
the model. Facilitators of modelling teams need to consider the serious implications of giving everyone what they want and
including all participants’ ideas in a model. In the long run, it may be better to be tough and reject many suggestions at
the outset. The former approach is unlikely to lead to a tractable model, while the latter may ultimately offer greater satisfaction
for all.
We are grateful to the UK’s Department for International Development (DFID) and the European Community for financial support
of this project. Thanks also to all of the ACM team who have contributed ideas on the process and content of the modelling
work and who make it fun to undertake collaborative research. Thanks also to the participants in the Zimbabwe FLAC workshops
for their input into the specification of the Mafungautsi model. Finally thanks to Robert Muetzelfeldt, Jasper Taylor, Jonathan
Massheder, Fergus Sinclair and Jerry Vanclay for helping us to ride on the FLORES bandwagon. 相似文献
1000.
BYUNBong-Kyu YANShan-chun LICheng-de 《林业研究》2003,14(3):210-212
Genus Eurydoxa Filipjev in China is reviewed and noted for the first time. Based on the present study, two species are recognized, including rhodopa Diakonoff and advena Filipjev. All available information for the species is reviewed and provided. 相似文献