• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>日本作物學會紀事 >Ecological Studies on the Photosynthesis of Winter Cereals : I. Diurnal changes in the photosynthesis of two-rowed barley under field condiditions in winter
【24h】

Ecological Studies on the Photosynthesis of Winter Cereals : I. Diurnal changes in the photosynthesis of two-rowed barley under field condiditions in winter

机译：冬季谷物光合作用的生态学研究：I。冬季田间放大下两划大麦光合作用的日变化

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Diurnal changes in apparent photosynthesis of two-rowed barley (Hordium distichum c.v. Azuma-goruden) were measured with assimilation chambers under field conditions during the period from December 1969 to February 1970. The assimilation chamber used was 25×25 cm in area and 20 cm high. Sampling of the air inside the chamber was made hourly (exp.B) or at intervals of half an hour (exp.A and C) for five minutes using vinyl ball to measure CO2 concentration of the air. Three types of experiments were designed as indicated below: Experiment A: The assimilation chamber was placed over the plot from the nightfall before the day of each experiment and kept until the end of the experiment. Experiment B: The chamber was placed over the plot ten minutes before each sampling of air and then removed soon after the sampling, for the purpose of putting the crop under national conditions as long as possible. Experiment C: The chamber was placed over the plot ten minutes before the first sampling of the air, but kept throughout the day until the end of the experiment. Four plots were used as replicates to measure the rates of photosynthesis in most of the experiments, but two plots in some cases. Soil temperature was measured only in the experiment B. 1. Results of the experiments A, B and C showed that apparent photosynthetic rates in the morning of clear winter days were mostly lower than those in the afternoon at equivalent solar radiation level. In the experiment B, on the other hand, there were some occasions in which photosynthesis was inhibited throughout the whole day. 2. Two assumptions were made, based on the results of the experiment B, about the relation between the inhibition of apparent photosynthesis and temperature regime. (1) In the morning when air temperature remains below O°C long time, soil layer surrounding the main root zone may be frozen. When the freezing of soil is prolonged in the daytime, the inhibition of photosynthesis may be large and continue until evening. (2) 0n the day when the minimum air temperature is below O°C but the soil freezing does not continue long time, the inhibition of photosynthesis may occur only in the morning. 3. It was found in the present experiments that the air temperature inside the chamber was higher than the ambient air temperature, especially at midday with difference of from 5°C to 8°C among the temperature inside and outside the chamber. This suggests the necessity of improving on the assimilation chamber
机译：两划大麦（Hordium Distichum CV Azuma-Goruden）的昼夜变化在1969年12月至1970年2月期间，在现场条件下，在现场条件下测量了同化室。面积和20厘米的同化室为25×25厘米高的。腔室内的空气的采样每小时（EXP.B）或以半小时（EXP.A和C）的间隔使用乙烯基球以测量空气的CO 2浓度。设计了三种类型的实验如下所示：实验A：将同化室从每个实验日之前的夜幕降至夜幕降低，并保持直到实验结束。实验B：将腔室放在剧情上十分钟在每次采样前10分钟，然后在取样后立即移除，以便尽可能长时间地将作物放在国家条件下。实验C：将腔室放置在第一次采样前十分钟在空气中的第一次采样之前，但整个一天才能保持直到实验结束。使用四个地块作为复制，以测量大多数实验中的光合作用率，但在某些情况下两个地块。土壤温度仅在实验B中测量。1.实验A，B和C的结果表明，明确的冬季日的早晨的光合速率大多低于当量在等效的太阳辐射水平下的光合速率。另一方面，在实验B中，有一些偶论的光合作用在整个一天中受到抑制。 2.基于实验B的结果，对表观光合作用和温度制度的关系进行了两个假设。 （1）在早晨的空气温度仍然低于O°C时，围绕主根区的土壤层可以冷冻。当白天延长土壤的冻结时，光合作用的抑制可能很大并持续到晚上。 （2）0N当天最低空气温度低于O°C但土壤冷冻不持续长时间，仅在早晨抑制光合作用。 3.在本实验中发现，室内的空气温度高于环境空气温度，特别是在室内和室外的温度下的5°C至8°C的午集。这表明需要改善同化室的必要性

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号