首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   12607篇
  免费   854篇
林业   1102篇
农学   453篇
基础科学   58篇
  2617篇
综合类   469篇
农作物   505篇
水产渔业   1088篇
畜牧兽医   5755篇
园艺   209篇
植物保护   1205篇
  2023年   89篇
  2022年   114篇
  2021年   282篇
  2020年   273篇
  2019年   195篇
  2018年   540篇
  2017年   578篇
  2016年   564篇
  2015年   405篇
  2014年   534篇
  2013年   708篇
  2012年   890篇
  2011年   826篇
  2010年   443篇
  2009年   418篇
  2008年   641篇
  2007年   577篇
  2006年   485篇
  2005年   516篇
  2004年   422篇
  2003年   398篇
  2002年   334篇
  2001年   270篇
  2000年   254篇
  1999年   226篇
  1998年   55篇
  1997年   44篇
  1996年   52篇
  1992年   136篇
  1991年   119篇
  1990年   111篇
  1989年   129篇
  1988年   126篇
  1987年   125篇
  1986年   116篇
  1985年   105篇
  1984年   82篇
  1983年   77篇
  1982年   48篇
  1981年   58篇
  1980年   50篇
  1979年   105篇
  1978年   93篇
  1977年   84篇
  1976年   55篇
  1975年   48篇
  1974年   100篇
  1973年   71篇
  1972年   94篇
  1971年   87篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Phytoparasitica - The current agricultural scenario faces a range of challenges, with phytosanitary ones being paramount. In most cases, plant diseases are treated with chemicals; however, they...  相似文献   
2.
3.
Journal of Plant Diseases and Protection - The objective of the present work was to evaluate the pathogenicity of Fusarium tricinctum in barley and to determine the potential effects on grain...  相似文献   
4.
5.

The ecological literature has documented the effects of plant hybridization on phenotypic variation, and dominant, intermediate, or novel morphological, chemical and physiological traits in hybrids. It is important to understand the ecological consequences of hybridization by evaluating their impact on phenotypic expression of functional traits. We evaluated the relationship between genetic diversity of Quercus laurina and functional foliar traits along an oak diversity gradient. We selected five study sites that represent an oak diversity gradient where Q. laurina is present. Using chloroplast and nuclear microsatellites, we evaluated genetic diversity, measured functional foliar traits of Q. laurina in each site and assessed the effects of local climate variables on the oak community and functional traits. We found a greater abundance of Q. laurina in all study sites. We did not find a relationship between the number of accompanying red oak species and the population genetic diversity in Q. laurina, but higher genetic diversity was found in all study sites in comparison with European oak species. Sites with more oak species had more variation of foliar functional traits. Our results do not support the hypothesis that predicts higher levels of genetic diversity of Q. laurina in communities with greater oak diversity from the same section, but we demonstrated an increase in the foliar functional traits of Q. laurina associated with oak richness and climate variables. We highlight the need to consider environmental and ecological variables linkages as regulatory mechanisms of the phenotypic plasticity expressed in changes of some functional attributes of oaks.

  相似文献   
6.
Plant Foods for Human Nutrition - Vegetal wastes are currently a source of pollution due to the excess of organic compounds in the environment. Seeds are the main by-product of the avocado industry...  相似文献   
7.
  1. Isoëtes sabatina is the rarest aquatic quillwort in Europe. Although recently found (2013) in Lake Bracciano (central Italy), the species is just one step away from extinction with an estimated population not exceeding 400 individuals and a spatial range of a few hundred square metres.
  2. Lake Bracciano is a deep, oligo-mesotrophic Mediterranean volcanic lake that has been subjected to human activities. From January to October 2017, the lake experienced a dramatic water level decrease (up to −1.50 m), which significantly affected the littoral zone and the habitat of I. sabatina.
  3. To improve the chances of survival of I. sabatina, the first eco-taxonomic investigation on this species was carried out to describe its genetic distinctness, physical and chemical requirements and companion species.
  4. The phylogenetic position of I. sabatina was investigated by applying standard DNA barcoding methods. Simultaneously, during summer 2019, the physical and chemical features of water and sediments of the I. sabatina population and five small Alpine lakes colonized by Isoëtes echinospora – a supposed close relative – were characterized. These data were then compared with the available data on the trophic requirements of the target obligate aquatic Isoëtes, together with Isoëtes lacustris and Isoëtes malinverniana.
  5. The present survey confirmed the taxonomic and ecological distinctness of I. sabatina – providing the first evidence of genetic differentiation from I. echinospora. Isoëtes sabatina grows in waters with temperature, conductivity and total alkalinity up to 30°C, 561 μS cm−1 and 3.45 meq L−1, respectively.
  6. The edaphic requirements of I. sabatina confirm its outstanding conservation value, and this study offers a basic understanding of how to prevent its extinction. Now, all possible actions must be taken immediately to save this species.
  相似文献   
8.
The use of live animals for educational purposes is an old practice that is still employed in teaching and research institutions. However, there are several objections to this practice, whether for ethical or humanitarian reasons. Surgical techniques teaching using anatomical pieces and/or preserved cadavers promotes greater learning efficiency, provides exercise repetition and increases the confidence and satisfaction of the students when compared to the use of live animals. The current work aimed to analyse the feasibility of using fresh swine urinary bladder and small intestines (jejunum), obtained from slaughterhouses, fixed in 99.8% ethyl alcohol (EA) and preserved in sodium chloride hypersaturated solution (SCHS) at 30%, for 7, 14 and 21 days, as an alternative method for surgical skills training (SST). Swine viscera, fixed in EA and preserved in SCHS, presented a realistic appearance, absence of odour and maintained the viable morphological characteristics during the performance of the operative techniques. Preservation solutions had low cost, were easy to acquire and did not offers risks to human health. Therefore, urinary bladders and small intestines fixed in 99.8% EA for 30 days and maintained in 30% SCHS at different periods were demonstrated as a good viable option as a preservation method for surgical skills training.  相似文献   
9.
10.
Gangwar  R. K.  Makádi  M.  Demeter  I.  Táncsics  A.  Cserháti  M.  Várbíró  G.  Singh  J.  Csorba  Á.  Fuchs  M.  Michéli  E.  Szegi  T. 《Eurasian Soil Science》2021,54(7):1007-1018
Eurasian Soil Science - This study was conducted with the aim to assess the effect of land use on chemical properties (organic carbon; pH; electrical conductivity; available P, K, Ca, Mg, Na),...  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号