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midday depression     
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  午休
     The results showed that net photosynthetic rate of S.baicalensis presented an atypical double-peak curve,with the peaks(19.33 and (15.45 μmol/(m~2·s)) respectively) appearing at 10:00 and 14:00.There appeared a slight phenomenon of "photosynthesis midday depression",and the stomata factors caused the decrease of Pn.
     结果表明:黄芩净光合速率日变化呈不明显的双峰曲线,峰值出现在10:00和14:00,分别为19.33,15.45μmol/(m2.s),有轻微的光合“午休”现象,黄芩净光合速率中午降低为气孔限制;
短句来源
     The results indicated that the curve of diurnal variation of net photosynthetic rate (P_n) was demonstrated single peak in spring,two peaks in clear days in summer,with midday depression of photosynthesis.
     结果表明:自然光下夏季牡丹叶片的净光合速率(Pn)明显低于春季,2个生长季节Pn日变化差异明显,即春季的Pn日变化呈“单峰型”曲线,夏季的Pn日变化为“双峰型”曲线,有明显的光合“午休”;
短句来源
     The results showed that Pn increased by 17.9% and 25.8% under elevated (550 and 750μmol·mol-1)CO2, compared to the ambient air CO2 concentration. At the same time, midday depression of photosynthesis abated or disappeared.
     结果表明,在大气CO2浓度为550、750μmol·mol-1时,比正常大气CO2水平下茶树叶片日平均净光合速率提高17.9%和25.8%,并缓解和消除了光合午休现象;
短句来源
     Relationship between Diurnal Variation of Photosynthetic Capacity, Carboxylation Efficiency and Midday Depression of Photosynthesis in Sweet Potato Leaves
     甘薯光合活力、羧化效率日变化与光合午休的关系
短句来源
     A Study on Photosynthetic Midday Depression of Wheat and Mechanism under Drought and WellWatered Conditions
     干旱与正常供水条件下小麦光合午休及其机理的研究
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  光合午休
     The results showed that Pn increased by 17.9% and 25.8% under elevated (550 and 750μmol·mol-1)CO2, compared to the ambient air CO2 concentration. At the same time, midday depression of photosynthesis abated or disappeared.
     结果表明,在大气CO2浓度为550、750μmol·mol-1时,比正常大气CO2水平下茶树叶片日平均净光合速率提高17.9%和25.8%,并缓解和消除了光合午休现象;
短句来源
     Relationship between Diurnal Variation of Photosynthetic Capacity, Carboxylation Efficiency and Midday Depression of Photosynthesis in Sweet Potato Leaves
     甘薯光合活力、羧化效率日变化与光合午休的关系
短句来源
     A Study on Photosynthetic Midday Depression of Wheat and Mechanism under Drought and WellWatered Conditions
     干旱与正常供水条件下小麦光合午休及其机理的研究
短句来源
     Results indicted that limited drip irrigation (which supplies 2/3 of water of the norm of 375 m 3·ha -1 which is widely employed in cotton cultivation in Xinjiang) caused water deficiency in cotton field, and the photosynthetic rate is reduced at 9:00 11:00 and significant midday depression is appeared, then increased again.
     结果表明 ,不同滴水量处理后 ,限量滴灌 (按新疆目前生产中 375m3 ·ha-1滴水定额的 2 /3)表现为棉田土壤水分亏缺 ,叶片光合速率在一天内的变化表现为上午 9:0 0~ 11:0 0比适量滴灌棉花叶片光合速率低 ,中午 12 :0 0~ 14 :0 0出现严重的光合午休现象 ,下午光合速率恢复。
短句来源
     Analysis of Causes of Midday Depression of Photosynthesis in Soybean Leaves
     大豆光合午休原因的分析
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  午休现象
     The results showed that Pn increased by 17.9% and 25.8% under elevated (550 and 750μmol·mol-1)CO2, compared to the ambient air CO2 concentration. At the same time, midday depression of photosynthesis abated or disappeared.
     结果表明,在大气CO2浓度为550、750μmol·mol-1时,比正常大气CO2水平下茶树叶片日平均净光合速率提高17.9%和25.8%,并缓解和消除了光合午休现象;
短句来源
     Results indicted that limited drip irrigation (which supplies 2/3 of water of the norm of 375 m 3·ha -1 which is widely employed in cotton cultivation in Xinjiang) caused water deficiency in cotton field, and the photosynthetic rate is reduced at 9:00 11:00 and significant midday depression is appeared, then increased again.
     结果表明 ,不同滴水量处理后 ,限量滴灌 (按新疆目前生产中 375m3 ·ha-1滴水定额的 2 /3)表现为棉田土壤水分亏缺 ,叶片光合速率在一天内的变化表现为上午 9:0 0~ 11:0 0比适量滴灌棉花叶片光合速率低 ,中午 12 :0 0~ 14 :0 0出现严重的光合午休现象 ,下午光合速率恢复。
短句来源
     The results showed that the daily variation of net photosynthetic rate in leaves presented single-peak curve,'midday depression' phenomenon weren't occurred,and the highest peak value appeared at noon,it's 18.7 μmol/(m~2·s).
     结果表明:花楸幼苗净光合速率日变化曲线均呈单峰型,无午休现象,且峰值(18.7μmol/(m2.s))出现在12:00,净光合速率的变化是由非气孔因素决定的;
短句来源
     There wasn't obvious photosynthetic midday depression in G80 leaves.
     G80叶片无明显光合午休现象
短句来源
     The results of the experiment indicated that the midday depression of photosynthesis was the result of the decrease in carboxilation efficiency (δA /δCi), photosythetic capacity(Ao)and RUBP regeneration capacity (Jmax)as well as an increase in the CO_2 compensation point (Γ) .
     实验结果表明,大豆叶片的光合午休现象主要是因为大豆叶片的羧化效率、光合能力,RUBP再生能力的下降以及CO_2补偿点升高造成的。
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  “midday depression”译为未确定词的双语例句
     Relationship Between Diurnal Variations of Photosynthetic Efficiency and Midday Depression of Photosynthetic Rate in Wheat Leaves Under Field Conditions
     田间小麦叶片光合效率日变化与光合“午睡”的关系
短句来源
     Potassium could reduce 26.5%~37% lose of photosynthetic rate caused by midday depression.
     钾可减少由于光合“午睡”造成的2 6 .5 %~ 37%的光合产量损失
短句来源
     The results show that the diurnal variation of its photosynthetic rate in leaves presented double peak curves but there was a significant midday depression; that the relationship between the photosynthetic rate and the light intensity is a linear one from 8∶30 to 9∶30 and the peaks occur at 9∶30 and 16∶30;
     结果表明:毛竹叶片光合速率日变化呈现双峰曲线,出现光合“午睡”现象,上午8∶00~9∶30,叶片光合速率随着光照强度的增加呈直线上升趋势,在9∶30出现全天第1个高峰值,16∶30出现第2个高峰值;
短句来源
     The first peak value was the highest,which occurred at about 10:00 am,the net photosynthetic rate was CO 213.1μmol·m -2·s -1,the second peak value occurred at 16:00 pm,the net photosynthetic rate was CO 29.5μmol·m -2·s -1.The main reason for the midday depression was stomatal factors.
     第 2个峰值出现在 16时 ,Pn为CO2 9.5 μmol·m-2 ·s-1。
短句来源
     with value 18.22 靘ol CO2·m-2·S-1, the second peak appeared at 15:00 p. m. with value 17.39靘ol CO2·m-2·S-1. There was a midday depression between 12:00~14:00 p.
     光合作用光补偿点和饱和点分别为44.6 靘ol·m-2·S-1和1 166.6 靘ol m-2·S-1;
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  midday depression
Diurnal changes in the net photosynthetic rate of all three cohorts of leaves were bimodal with an early morning maximum, a pronounced midday depression and a small recovery late in the afternoon.
      
A midday depression was observed in the photon saturated photosynthetic rate in both species, especially at the upper crown.
      
However, the midday depression of total activity indicates that besides CA1P there function some other inhibitors of RuBPCO.
      
Both initial and total RuBPCO activities as well as the activation state had a typical pattern with two peaks in the morning and afternoon, respectively, and a midday depression.
      
malaccensis, an increase in VPD leads to partial stomatal closure and, subsequently, reductions in PN and the midday depression of PN of this plant.
      
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The photosynthesis of flag leaves of wheat measured with an infrared gas analyser displayed significant 'midday depression' on bright sunny days in early summer under field conditions. The net photosynthetic rate increased rapidly for a few hours after sunrise, reached a peak at about 10 A. M. which was followed by a marked decrease until about 2 P. M., then increased again and reached a second but lower peak at about 4 P. M.

小麦叶片的光合作用有明显的“午睡”(即“中午降低”现象)。 光合作用的“中午降低”只是在较小的程度上与大气CO_2浓度下降有关,而与中午前后颇低的空气相对湿度和较高的温度引起的饱和差的增加有很大的关系。通过增加空气湿度(伴随降温)缩小饱和差,不仅消除了小麦叶片的“午睡”现象,而且显著地提高了净光合作用速率。 提出了一个解释光合作用“午睡”机理的图解。

The steppe dominanted by Stipa grandis is one of the zonal type in mid- dle part of Nei Monggol(Inner-Mongolia).Several stands with different biomass and plant height appeared after an accidental fire caused by smoking.On these stands and an additional irrigation treatment,a comparative study on photosynthetic rate was performed by means of assimilation chamber.The results are as follow: 1.In July,1981,with little precipitation,the diurnal curve of photosynthetic rate in all stands showed“double peak”form and“midday...

The steppe dominanted by Stipa grandis is one of the zonal type in mid- dle part of Nei Monggol(Inner-Mongolia).Several stands with different biomass and plant height appeared after an accidental fire caused by smoking.On these stands and an additional irrigation treatment,a comparative study on photosynthetic rate was performed by means of assimilation chamber.The results are as follow: 1.In July,1981,with little precipitation,the diurnal curve of photosynthetic rate in all stands showed“double peak”form and“midday depression”being pronounced, while in stands August,it become slight.Particularly,in stands with ample supply of water and fertilizer,the midday depression was almost absent.2.The peak value of photosynthetic rate before noon was diferent from that of afternoon.In arid weather, the peak before noon was higher than in the afternoon,while under rainy weather the reverse was observed.3.The net photosynthetic rate per day in different stands was different too,the highest one being the stand with sand cover,the next being that with thick soil and burned,and the lowest one being that with thin soil and after burning. All these facts show that the change of and difference in photsynthetic rate are cor- related with water and nutrient conditions in the environment.

大针茅(Stipa grandis)草原是内蒙古中部地带性草原类型之一。它在野火影响下出现了几个具不同生物量和结构的群落。在此基础上进行灌水处理,用同化箱 CO_2气体交换法进行了群落光合速率的比较研究。研究表明:1.在少雨的1981年7月,所有群落地段的光合日变化都呈双峰型,“中午降低”现象明显。而在多雨的8月,“中午降低”较为轻微,尤其在水肥较多的群落,甚至看不出这一现象。2.上午和下午都呈现峰值,但不相同。在干旱天气状况下,上午的峰值比下午高。而在多雨天气,则情况恰恰相反。3.不同群落地段的日净光合速率有显著差异。未经火烧覆砂地段最高,次为火烧灌水厚土地段,火烧薄土地段最低。这些事实初步说明在野外条件下光合速率的差异与环境的水分、营养状况有密切关系。

In order to evaluate the effects of important ecophysiolorical factors, such as light intensity, temperature, relative humidity, leaf structure(SLW, specific leaf weight; and SLA, specific leaf area) etc., on the net photosynthetic rate(Pn) of Gordonia under natural conditions, the diurual and seasonal variations in Pn are measured with the improved dry-weight method.The results show that the diurnal variation in Pn on sunny days in spring, summer, and autumn assumes the shape of a bimodal curve, which has two...

In order to evaluate the effects of important ecophysiolorical factors, such as light intensity, temperature, relative humidity, leaf structure(SLW, specific leaf weight; and SLA, specific leaf area) etc., on the net photosynthetic rate(Pn) of Gordonia under natural conditions, the diurual and seasonal variations in Pn are measured with the improved dry-weight method.The results show that the diurnal variation in Pn on sunny days in spring, summer, and autumn assumes the shape of a bimodal curve, which has two peaks, one in the morning and the other in the afternoon, with midday depression in between. However, in winter, Pn shows an unimodal pattern. The day average of Pn is 9.00mgdm-2 h-1 from May to November and the maximum value (23.44mgdm-2 h-1) is observed at the end of August.The curve of seasonal variations in Pn parallels, to some degree, that of the seasonal temperature. Three marked parts can be clearly distinguished. The first one lasts from January till May, in which Pn increases graadually with increasing temperature. The second one lies between May and October, and shows great fluctuation. The third period begins from October, and the Pn decreases with decreasing temperature.It is suggested that temperature and light intensity were the two master limiting ecological factors affecting Pn, and that relative humidity, chlorophyll contents and SLW have only a little on it. The relationship between temperature and Pn can be described by an asymetric bell-shaped curve, on which the three cardinal temperature of Pn can be seen: the minimum at 4-5℃, the optimum at 25-30℃, or slight higher than 30℃, and the maximum over 30℃. The light saturation point of Pn is 70,000 1x, whereas the light compensation point is 3,000lx or so. Within the optimum temperature 25-30℃, Pn is largely controlled by light intensity and positively related to it. Once below or over it, Pn is mainly determined by temperature and positively or negatively associated with it.That Gordonia is a light-demanding but fairly shade-tolerant tree species is demonstrated by shade experiment as well.

为了探讨在自然条件下重要生理生态因子,如光照强度、温度、相对湿度、叶结构(SLW,单位叶面积干重;SLA,单位叶面积率)等对四川大头茶净光合作用(Pn)的影响,本文采用改良半叶法测定四川大头茶净光合作用日变化和年变化,并结合遮阴实验详细研究了生理生态因子与Pn的关系.本文研究结果可为营造和管理亚热带常绿阔叶林和亚热带常绿针阔混交林提供一定的理论依据.实验结果表明:春、夏、秋三季晴天,Pn日变化呈双峰曲线型.即上午和下午各出现一次Pn高峰,峰谷则是Pn的中午降低现象.而冬季晴天Pn呈单峰曲线型,高峰出现在14点左右.5至11月Pn日均值为9.00mgdm~(-2)h~(-1).所测最高Pn值(23.44mgdm~(-2)h~(-1))出现在8月底.一定程度上,Pn的年变化曲线与温度年变化曲线相似,可以明显地区分为三部份:第一部份为1月到5月,Pn随着温度的逐步上升相应增高;5月到10月为第二部份,此期间,Pn波动较大.5月初Pn较 低,可能是新叶角质层未完全发育成熟,因而比成熟叶对温度更为敏感的缘故.7月中旬Pn低则是连续较高温度结果;第三部份从10月到12月,Pn随着温度的下降而降低.Pn季节变化显著,与植物...

为了探讨在自然条件下重要生理生态因子,如光照强度、温度、相对湿度、叶结构(SLW,单位叶面积干重;SLA,单位叶面积率)等对四川大头茶净光合作用(Pn)的影响,本文采用改良半叶法测定四川大头茶净光合作用日变化和年变化,并结合遮阴实验详细研究了生理生态因子与Pn的关系.本文研究结果可为营造和管理亚热带常绿阔叶林和亚热带常绿针阔混交林提供一定的理论依据.实验结果表明:春、夏、秋三季晴天,Pn日变化呈双峰曲线型.即上午和下午各出现一次Pn高峰,峰谷则是Pn的中午降低现象.而冬季晴天Pn呈单峰曲线型,高峰出现在14点左右.5至11月Pn日均值为9.00mgdm~(-2)h~(-1).所测最高Pn值(23.44mgdm~(-2)h~(-1))出现在8月底.一定程度上,Pn的年变化曲线与温度年变化曲线相似,可以明显地区分为三部份:第一部份为1月到5月,Pn随着温度的逐步上升相应增高;5月到10月为第二部份,此期间,Pn波动较大.5月初Pn较 低,可能是新叶角质层未完全发育成熟,因而比成熟叶对温度更为敏感的缘故.7月中旬Pn低则是连续较高温度结果;第三部份从10月到12月,Pn随着温度的下降而降低.Pn季节变化显著,与植物生长、发育密切相关.除秋季外,春、夏、冬三季的Pn值与当年生枝条的伸长速率呈正相关.秋季植物的开花极大地减慢了枝条的伸长.生理生态因子与

 
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