全文获取类型
收费全文 | 251篇 |
免费 | 34篇 |
国内免费 | 1篇 |
专业分类
林业 | 31篇 |
农学 | 2篇 |
基础科学 | 1篇 |
34篇 | |
综合类 | 27篇 |
农作物 | 14篇 |
水产渔业 | 26篇 |
畜牧兽医 | 119篇 |
园艺 | 9篇 |
植物保护 | 23篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 8篇 |
2021年 | 13篇 |
2020年 | 17篇 |
2019年 | 17篇 |
2018年 | 11篇 |
2017年 | 20篇 |
2016年 | 13篇 |
2015年 | 8篇 |
2014年 | 11篇 |
2013年 | 6篇 |
2012年 | 21篇 |
2011年 | 24篇 |
2010年 | 13篇 |
2009年 | 11篇 |
2008年 | 16篇 |
2007年 | 11篇 |
2006年 | 14篇 |
2005年 | 4篇 |
2004年 | 13篇 |
2003年 | 7篇 |
2002年 | 2篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1902年 | 1篇 |
1900年 | 1篇 |
1883年 | 1篇 |
排序方式: 共有286条查询结果,搜索用时 750 毫秒
161.
162.
163.
Melody A. de Laat Tobias Warnken Julien Delarocque Dania B. Reiche Anne J. Grob Karsten Feige Harry B. Carslake Andy E. Durham Martin N. Sillence Kristen E. Thane Nicholas Frank Johan Brojer Sanna Lindase Johanna Sonntag 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2023,37(1):302-314
164.
165.
166.
Silvicultural treatments creating large canopy openings failed to restore regeneration of balsam fir (Abies balsamea (L.) Mill.) due to browsing pressure from white-tailed deer (Odocoileus virginianus Zimmermann). Consequently, we tested two alternative silvicultural treatments aimed at improving balsam fir establishment on Anticosti Island (Québec, Canada). In 1998 and 1999, we set up shelterwood seed cutting using three harvest intensities (0, 25 and 40% of basal area) and strip clearcutting with scarification using three different strip widths (15, 30 and 45 m), both with fenced and unfenced regeneration plots, in balsam fir stands. After 8 years, shelterwood seed cutting did not allow the establishment of new balsam fir seedlings, nor the development of unbrowsed balsam fir seedlings. In the strip clearcutting, deer browsing suppressed growth of palatable species in all strip widths. This favoured the development of unpalatable species, especially white spruce (Picea glauca (Moench) Voss). Our study demonstrates that the use of silvicultural treatments alone is unlikely to restore balsam fir regeneration on Anticosti Island, as long as the deer population remains higher than 20 deer/km2. 相似文献
167.
Brigitte Courtois Nourollah Ahmadi Farkhanda Khowaja Adam H. Price Jean-François Rami Julien Frouin Chantal Hamelin Manuel Ruiz 《Rice》2009,2(2-3):115-128
During the last 10 years, a large number of quantitative trait loci (QTLs) controlling rice root morphological parameters have been detected in several mapping populations by teams interested in improving drought resistance in rice. Compiling these data could be extremely helpful in identifying candidate genes by positioning consensus QTLs with more precision through meta-QTL analysis. We extracted information from 24 published papers on QTLs controlling 29 root parameters including root number, maximum root length, root thickness, root/shoot ratio, and root penetration index. A web-accessible database of 675 root QTLs detected in 12 populations was constructed. This database includes also all QTLs for drought resistance traits in rice published between 1995 and 2007. The physical position on the pseudo-chromosomes of the markers flanking each QTL was determined. An overview of the number of root QTLs in 5-Mb segments covering the whole genome revealed the existence of “hot spots,” The 32 trait × chromosome combinations comprising six or more QTLs were subjected to a meta-QTL analysis using the software package MetaQTL. The method enabled us both to determine the likely number of true QTLs in these areas using an Akaike information criterion and to estimate their position. The meta-QTL confidence intervals were notably reduced and, for the smallest ones, encompassed only a few genes. 相似文献
168.
Vialatte Aude Barnaud Cecile Blanco Julien Ouin Annie Choisis Jean-Philippe Andrieu Emilie Sheeren David Ladet Sylvie Deconchat Marc Clément Floriane Esquerré Diane Sirami Clelia 《Landscape Ecology》2019,34(7):1653-1673
Landscape Ecology - While the concept of ecosystem services (ES) is well established in the scientific and policy arenas, its operationalization faces many challenges. Indeed, ES supply, demand and... 相似文献
169.
Teixeira Fernanda Zimmermann Bachi Laura Blanco Julien Zimmermann Ilaine Welle Iara Carvalho-Ribeiro Sónia M. 《Landscape Ecology》2019,34(7):1583-1600
Landscape Ecology - The landscape approach and the ecosystem services (ES) framework have been widely used to investigate human-nature relationships and orient landscape planning and management.... 相似文献