全文获取类型
收费全文 | 2074篇 |
免费 | 111篇 |
国内免费 | 349篇 |
专业分类
林业 | 238篇 |
农学 | 109篇 |
基础科学 | 186篇 |
946篇 | |
综合类 | 754篇 |
农作物 | 39篇 |
水产渔业 | 16篇 |
畜牧兽医 | 171篇 |
园艺 | 16篇 |
植物保护 | 59篇 |
出版年
2024年 | 27篇 |
2023年 | 77篇 |
2022年 | 89篇 |
2021年 | 92篇 |
2020年 | 95篇 |
2019年 | 96篇 |
2018年 | 89篇 |
2017年 | 114篇 |
2016年 | 158篇 |
2015年 | 117篇 |
2014年 | 129篇 |
2013年 | 168篇 |
2012年 | 181篇 |
2011年 | 158篇 |
2010年 | 110篇 |
2009年 | 125篇 |
2008年 | 85篇 |
2007年 | 95篇 |
2006年 | 101篇 |
2005年 | 68篇 |
2004年 | 75篇 |
2003年 | 56篇 |
2002年 | 27篇 |
2001年 | 31篇 |
2000年 | 34篇 |
1999年 | 30篇 |
1998年 | 24篇 |
1997年 | 32篇 |
1996年 | 10篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 12篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1956年 | 1篇 |
排序方式: 共有2534条查询结果,搜索用时 15 毫秒
91.
92.
Short-term effects of nitrogen on methane oxidation in soils 总被引:6,自引:0,他引:6
P. Tlustos T. W. Willison J. C. Baker D. V. Murphy D. Pavlikova K. W. T. Goulding D. S. Powlson 《Biology and Fertility of Soils》1998,28(1):64-70
The short-term effects of N addition on CH4 oxidation were studied in two soils. Both sites are unfertilized, one has been under long-term arable rotation, the other
is a grassland that has been cut for hay for the past 125 years. The sites showed clear differences in their capacity to oxidise
CH4, the arable soil oxidised CH4 at a rate of 0.013 μg CH4 kg–1 h–1 and the grassland soil approximately an order of magnitude quicker. In both sites the addition of (NH4)2SO4 caused an immediate reduction in the rate of atmospheric CH4 oxidation approximately in inverse proportion to the amount of NH4
+ added. The addition of KNO3 caused no change in the rate of CH4 oxidation in the arable soil, but in the grassland soil after 9 days the rate of CH4 oxidation had decreased from 0.22 μg CH4 kg–1 h–1 to 0.13 μg CH4 kg–1 h–1 in soil treated with the equivalent of 192 kg N ha–1. A 15N isotopic dilution technique was used to investigate the role of nitrifiers in regulating CH4 oxidation. The arable soil showed a low rate of gross N mineralisation (0.67 mg N kg–1 day–1), but a relatively high proportion of the mineralised N was nitrified. The grassland soil had a high rate of gross N mineralisation
(18.28 mg N kg–1 day–1), but negligible nitrification activity. It is hypothesised that since there was virtually no nitrification in the grassland
soil then CH4 oxidation at this site must be methanotroph mediated.
Received: 31 October 1997 相似文献
93.
Oxidation of methane in the rhizosphere of rice plants 总被引:14,自引:0,他引:14
Oxidation of CH4 in the rhizosphere of rice plants was quantified using (1) methyl fluoride, a specific inhibitor of CH4 oxidation, and (2) measuring changes in plant-mediated CH4 emission after incubation under air, N2, or 40% O2. No significant rhizospheric CH4 oxidation was observed from rice plants in the ripening stage. CH4 emission from rice plants 1 week before panicle initiation increased by 40% if CH4 oxidation in the rhizosphere was blocked. The growth stage of the rice plant is an important factor determining the rhizospheric CH4 oxidation. Fluctuation of rhizospheric CH4 oxidation during the growing season may help to explain the observed seasonal CH4 emission patterns in field studies. Measurements from four rice varieties showed that one variety, Pokkali, had higher rhizospheric CH4 oxidation. This was probably because Pokkali was in an earlier growth stage than the other three varieties. Both in the early and in the late growth stages, incubation under N2 caused a much stronger CH4 flux than inhibition of CH4 oxidation alone. Apparently, N2 incubation not only blocked CH4 oxidation but also stimulated methanogenesis in the rhizosphere. Incubation under a higher O2 atmosphere (40% O2) than ambient air decreased the CH4 flux, suggesting that increasing the oxidation of the rice rhizosphere may help in reducing CH4 fluxes from rice agriculture. The O2 pressure in the rhizosphere is an important factor that reduces the plant-mediated CH4 flux. However, inhibition of methanogenesis in the rhizosphere may contribute more to CH4 flux reduction than rhizospheric CH4 oxidation. 相似文献
94.
六氟化硫(SF6)示踪法测定反刍动物甲烷排放的技术 总被引:5,自引:0,他引:5
详细描述了用六氟化硫示踪法测定反刍动物甲烷排放的技术,包括基本原理、仪器准备和测试条件。还研究了适用于中国的采气设备、示踪参数、测定条件等技术,本技术经济实用且易操作,现正在试用。 相似文献
95.
In a greenhouse study, methane emissions were measured from two diverse Indian rice-growing soils planted to five rice cultivars
under similar water regimes, fertilizer applications and environmental conditions. Significant variations were observed in
methane emitted from soils growing different cultivars. Total methane emission varied between 8.04 and 20.92gm–2 from IARI soil (Inceptisol) and between 1.47 and 10.91gm–2 from Raipur soil (Vertisol) planted to rice. In all the cultivars, emissions from IARI soil were higher than from Raipur
soil. The first methane flux peak was noticed during the reproductive phase and the second peak coincided with the grain-ripening
stage of the rice cultivars.
Received: July 7, 1996 相似文献
96.
水稻田甲烷的减排方法研究 总被引:8,自引:1,他引:8
通过多年对稻田甲烷排放量的野外实验观测和对稻田甲烷产生与排放因子的研究,总结出减少稻田烷排放的主要方法,分析了各种减排方法的效果和经济效益,并利用层次分析法对各种减排方法做了综合的评价。现有的稻田甲减排方法主要有其它肥料代替传统的有机肥,种植低甲排放的水稻品种、灌水管理等。适用中国国情的方法主要有杂交稻替代常规稻,沼渣肥替代纯有要肥,沼渣肥替代有机肥的减排效果较好,社会效益和环境效益明显优于杂交稻 相似文献
97.
浅谈推算和预测宏观尺度土壤N_2O释放量的方法 总被引:8,自引:1,他引:8
土壤是N2 O的最主要释放源 .本文综述了根据局部地区土壤N2 O释放观察结果 ,推算和预测宏观尺度土壤甚至全球土壤N2 O释放通量变化和年释放量的方法 ,评述了各类方法的优缺点 ;并着重讨论了释放过程机理模型的应用 . 相似文献
98.
以山东省桓台县为试验地点,分析在高产条件下,不同秸秆还田模式和氮肥施用量对农田N2O排放的影响.试验结果表明,氮肥施用量与秸秆还田模式都是影响土壤N2O排放的重要因素;小麦秸秆还田可以大大降低土壤N2O的排放,施用有机粪肥是影响N2O排放的另一重要因素. 相似文献
99.
100.
稻田温度与甲烷排放通量关系的研究 总被引:5,自引:0,他引:5
稻田温度与CH4 排放通量有密切关系 ,通过灰关联分析发现稻田 5cm深处温度与CH4 排放通量关系最密切 ,水稻抽穗期CH4 排放通量达极大值 ,而完熟期CH4 排放通量达极小值。温度对CH4 排放通量的增效应明显 ,减效应较弱。稻田温度与CH4排放通量的关系呈S型曲线相关关系。 相似文献