全文获取类型
收费全文 | 2257篇 |
免费 | 212篇 |
国内免费 | 135篇 |
专业分类
林业 | 267篇 |
农学 | 180篇 |
基础科学 | 109篇 |
154篇 | |
综合类 | 950篇 |
农作物 | 63篇 |
水产渔业 | 303篇 |
畜牧兽医 | 178篇 |
园艺 | 87篇 |
植物保护 | 313篇 |
出版年
2024年 | 15篇 |
2023年 | 60篇 |
2022年 | 64篇 |
2021年 | 77篇 |
2020年 | 101篇 |
2019年 | 133篇 |
2018年 | 94篇 |
2017年 | 98篇 |
2016年 | 93篇 |
2015年 | 88篇 |
2014年 | 110篇 |
2013年 | 147篇 |
2012年 | 145篇 |
2011年 | 164篇 |
2010年 | 132篇 |
2009年 | 139篇 |
2008年 | 106篇 |
2007年 | 120篇 |
2006年 | 93篇 |
2005年 | 94篇 |
2004年 | 68篇 |
2003年 | 50篇 |
2002年 | 52篇 |
2001年 | 51篇 |
2000年 | 34篇 |
1999年 | 35篇 |
1998年 | 32篇 |
1997年 | 31篇 |
1996年 | 23篇 |
1995年 | 16篇 |
1994年 | 23篇 |
1993年 | 21篇 |
1992年 | 29篇 |
1991年 | 12篇 |
1990年 | 18篇 |
1989年 | 13篇 |
1988年 | 13篇 |
1987年 | 3篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有2604条查询结果,搜索用时 265 毫秒
181.
182.
The life history traits of 42 marine fish species were grouped according to the theoretical classifications of life history strategies. This provides a conceptual framework of management options, because life history strategies are the underlying determinants for population responses to climate and ocean changes, they can be used to classify typical population responses. When faced with providing management advice for species for which there is no information on absolute or relative biomass, such as newly exploited species, life history traits can be used to classify the species into a strategist grouping and the appropriate management options can be selected from the conceptual framework. 相似文献
183.
Yvonne Sadovy George Mitcheson Maria B. Rasotto 《Aquarium Sciences and Conservation》2001,3(4):253-263
The mandarinfish, Synchiropus splendidus, is a small, pelagic-spawning enthic dragonet of the western Pacific. Although popular in the marine aquarium trade, little
is known of its fishery or biology. All aquarium-trade animals are currently taken from the wild and the impact of heavy collecting
is unknown. The specialized and selective nature of the fishery for mandarinfish is described and its potential to disrupt
the mating system identified. As a possible alternative to wild capture and as an aid to sustainable exploitation, egg production
and early development relevant to mariculture are described, including egg output, embryo, larva and post-settlement development
to 30 days, based on live material. Egg output was determined for 40 females and ranged from 12 to 205 eggs. Embryo and larva
development were rapid, with settlement occurring within 14 days at 24–26 °C, and at 3.5 mm TL. The swimbladder is retained
in adults. Our limited attempts at raising the mandarinfish to settlement were encouraging and suggest an excellent potential
for mariculture with implications for both conservation and improved maintenance of fish in captivity. At present, given that
this species is difficult to maintain in captivity, it is only suitable for experienced aquarists. Preliminary diet information
is provided.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
184.
S. R. Adams M. B. Flinn B. M. Burr M. R. Whiles J. E. Garvey 《Ecology of Freshwater Fish》2006,15(3):291-300
Abstract – Ecology of larval blue sucker, Cycleptus elongatus , a North American catostomid that has declined throughout its range, is poorly known because larvae have rarely been sampled. A total of 316 young blue suckers (16.0–39.0 mm total length) was captured over 3 years at 14 off-channel sites in Pool 25, Mississippi River. Blue suckers demonstrated distinct temporal and spatial abundance patterns. Blue suckers were only captured in late May/early June, and were more abundant during a year of little flooding. Abundance was correlated with the distance a site was from the main channel, being highest in island borders and island sloughs in proximity to the channel. Fish guts contained a relatively high biomass of chironomids and zooplankton, suggesting islands were providing suitable feeding opportunities. Because of their proximity to flows, slack waters provided by islands were accessible to blue sucker larvae dispersing from channel spawning areas and facilitated their development into rheophilic juveniles. 相似文献
185.
186.
Myxobolus pseudodispar (Gorbunova) is a common parasite of the muscle of roach, Rutilus rutilus L., whereas its actinosporean development occurs in two oligochaete alternate hosts. This paper reports the complete developmental cycle of this parasite in the oligochaete alternate host Tubifex tubifex and the roach. In laboratory experiments, parasite-free T. tubifex specimens were infected by myxospores of M. pseudodispar collected from roach in Lake Balaton. Parasite-free roach fingerlings were infected with floating triactinospores (TAMs) released from oligochaetes on day 69 after challenge. Young plasmodia and spores in roach were first recorded on day 80 post-exposure (p.e.). Myxospores collected from experimentally infected roach initiated a new development in T. tubifex and the resulting TAMs infected roach. No infection of roach resulted from feeding oligochaetes containing mature triactinospores. 相似文献
187.
Liuwei Wang Yong Sik Ok Daniel C. W. Tsang Daniel S. Alessi Jörg Rinklebe Ondřej Mašek Nanthi S. Bolan Deyi Hou 《Soil Use and Management》2022,38(1):14-38
Engineered biochars are promising candidates in a wide range of environmental applications, including soil fertility improvement, contaminant immobilization, wastewater treatment and in situ carbon sequestration. This review provides a systematic classification of these novel biochar composites and identifies the promising future trends in composite research and application. It is proposed that metals, minerals, layered double hydroxides, carbonaceous nanomaterials and microorganisms enhance the performances of biochars via distinct mechanisms. In this review, four novel trends are identified and assessed critically. Firstly, facile synthesis methods, in particular ball milling and co-pyrolysis, have emerged as popular composite fabrication strategies that are suitable for large-scale applications. Secondly, biochar modification with green materials, such as natural clay minerals and microorganisms, align well with the on-going green and sustainable remediation (GSR) movement. Furthermore, new applications in soil health improvement and climate change mitigation support the realization of United Nation's Sustainable Development Goals (SDGs). Finally, the importance of field studies is getting more attention, since evidence of field success is critically needed before large-scale applications. 相似文献
188.
为了避免黄冠梨果实在低温贮藏(0 ℃左右)条件下果皮褐变的发生,该研究采用5、20和100 μL/L外源乙烯对黄冠梨进行贮前处理,以0 ℃贮藏下无外源乙烯处理作为对照组,以采后恒温至30 ℃、逐步降温至0 ℃处理作为程序降温组。通过外源乙烯处理组与对照及程序降温组的对比,探讨采后外源乙烯处理对黄冠梨果皮褐变与果实品质的影响。结果表明,不同浓度的外源乙烯处理均能完全抑制褐变的发生,且表皮无伤害,而程序降温组的发病指数为10%,对照组则高达37.6%。货架期结束时(6 d)外源乙烯处理组的果实硬度与对照组差异显著(P < 0.05)。外源乙烯各处理组果实含水率均高于对照及程序降温组(P < 0.05),利用低场核磁共振技术检测发现对照组自由水含量最高,5和100 μL/L外源乙烯处理组自由水含量较低。与对照组和程序降温组比较,外源乙烯处理对黄冠梨果实中可溶性固形物、可滴定酸、可溶性糖和抗坏血酸等果实品质指标都能起到提高或者维持的效果,其中5 μL/L处理浓度的效果较优。研究结果表明,贮前外源乙烯处理是一种既能抑制黄冠梨果皮褐变又能保持果实货架期品质的高效、简便的技术。 相似文献
189.
190.