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光照状况    
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  light regime
    Effect of Light Regime after Photoinhibition on Recovery of Photosynthetic Rate and Scavenging System of Active Oxygen
    光照状况对光抑后的恢复和活性氧清除系统的影响
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  light regime
In a variable light regime, the fishes grow at a higher rate, have decreased oxygen and food requirements, improve the utilization of consumed food for growth, and decrease the oxygen expenditure per increment of unit body mass.
      
The goldfish reactions to the frequency of illumination oscillation and the succession of the stationary light regime by the oscillatory regime were described.
      
During changes of the light regime, some adaptive reactions last several months and others occur within a few days.
      
Some physiological and biochemical alterations occur as early as the next day after the light regime changes.
      
The concentration of cGMP in the tissues of oat (Avena sativaL.) seedlings was shown to depend on seedling age and the light regime of their growth.
      
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The tree size, crown structure, vegetative growth, yield effciency. some anatomical and physiological characteristics of different dwarf-type satsuma ( Citrus unshiu Marc. ) trees selected from the citrus groves of Zhejiang province were studied. These dwarf-type strains may be divided into three types: dwarf, semi-dwarf and semi-standard. The tree height was about 1.0 to 2.4 m and their crown volume were 12% to G5% of their controls. Relative to the standard strains,the dwarf types have weaker apical dominance...

The tree size, crown structure, vegetative growth, yield effciency. some anatomical and physiological characteristics of different dwarf-type satsuma ( Citrus unshiu Marc. ) trees selected from the citrus groves of Zhejiang province were studied. These dwarf-type strains may be divided into three types: dwarf, semi-dwarf and semi-standard. The tree height was about 1.0 to 2.4 m and their crown volume were 12% to G5% of their controls. Relative to the standard strains,the dwarf types have weaker apical dominance in their shoot growth, and more 1st and 2nd class scaffold branches.Moreover, their root distribution is shallower with less feeding roots. The yield per m2 of the crown of the dwarf trees was a-pproximately the same as that of the controls.The yield per m3 of crown-volume, however, was all higher than that of the controls. There was a high positive correlation between the percentage of vessel crossscc-tional area to xylcm cross-sectional area and the relative crown size.An inverse relationship was observed between the total shoot length of the young dwarf trees and the percentage of blooming trees. The mechanism of dwarfing, the potential merits and faults of dwarf strains and their possible usages were discussed.

本文报道了1978~1981年对浙江桔区所选矮生类型温州蜜柑嫁接植株的生物学特性的研究结果。文中叙述了四种矮生类型的植株大小、树体结构、树冠光照状况、生长结果及某些解剖和生理特点,讨论了各矮生类型的优缺点和潜在应用价值,对矮生原因作了初步探讨,并提出柑桔矮生型的选种指标。

To study the mechanism of photosynthesis recovery from photoinhibition and the differences a-mong rice varieties, three varieties with different sensibility to photoinhibition were used . The rate of photosynthesis for leaves of the same physiological age was measured under controlled light and temperature conditions. In the first experiment (Fig. 1) ,it was found that light was required during recovery after photoinhibition. Moreover,the recovery was accelerated if a short-term dark was given in the course....

To study the mechanism of photosynthesis recovery from photoinhibition and the differences a-mong rice varieties, three varieties with different sensibility to photoinhibition were used . The rate of photosynthesis for leaves of the same physiological age was measured under controlled light and temperature conditions. In the first experiment (Fig. 1) ,it was found that light was required during recovery after photoinhibition. Moreover,the recovery was accelerated if a short-term dark was given in the course. The second experiment (Fig. 2)showed that the initial rate of recovery was increased with rising light intensities. Under higher light intensities(800. 600. 400μE. m~-2s~-1)the rate of photosynthesis reached the maximum earlier and then dropped,while under lower light intensities (200, 110μE. m~-2s~-1),the rate continued rising. In the third experiment (Fig. 3), the trend of change in the scavenging system of active oxygen was found to be contrary to that in the photosyn-thetic rate (Pn)during the process of photoinhibition and recovery. Significant differences in recovery rates were found among varieties.

用水稻品种牛脚扁糯、Mars和02428研究光抑后的光照状况对光合速率恢复和活性氧清除系统的影响。结果看出,恢复过程需要光,恢复前给以短期黑暗再照光,对恢复有促进作用。在800μE.m~(-2)s~(-1)光强以下,恢复的初期速度随光强水平的提高而增加。在光抑和恢复过程中,活性氧清除系统的变化与光合速率呈相反的趋势。品种间清除活性氧所依赖的主要途径有差异,并且光合速率恢复速度也有很大不同。

A comparative study was carried out, 1982~1985, on the crown structure, photosynthetic characteristic, photosynthetic efficiency, production and distribution of dry matter, fruit yield and quality of two

对‘国光’苹果两种树冠结构、光照特点、光合效率、干物质的生产与分配、果品的产量与品质进行了研究。探明双层形的光照状况明显优于圆头形,其光合强度、光合效率、各器官干物质积累的总量、果实干物质的积累量,平均每公顷产量比圆头形分别高25.45%、12.47%、15.31%、50.69%、19.18%,且果品质优,产量稳定。该研究结果经在河北省大面积推广应用,其增产、增收效果十分显著。

 
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