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首页> 外文期刊>日本作物學會紀事 >Relation between Environmental Conditions and Production-and Consumption Activities of Individual Leaves in the Population of Rice Plant in a Paddy Field : I. Changs in photosynthesis and dark respiration of individual leaves under field conditions
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Relation between Environmental Conditions and Production-and Consumption Activities of Individual Leaves in the Population of Rice Plant in a Paddy Field : I. Changs in photosynthesis and dark respiration of individual leaves under field conditions

机译：稻田中水稻植物人口环境条件与消费活动的关系：I.在田间条件下，个体叶片光合作用和暗呼吸的常数

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To understand the life of rice plant more actually, photosynthetic and respiratory rates of individual leaf of different age were measured for 7-8 days continuously at each of the 3 growth stages (panicle formation stage, boot stage and ripening stage) under field conditions and their relationships with the environmental conditions were discussed. 1. The ambient CO2 concentrations at 3 layers (80, 50 and 20 cm from the ground level, respectively) in the canopy were high during night, probably being relatcd with the very low wind speed. During daytime, CO2 concentration of middle and low layers was lower than that of the upper layer as much as 25 ppm, but all the layers showed almost similar changing patterns of CO2 conccntration in different days or different seasons, probably due to adequate influx of air into the canopy. 2. Daily or seasonal differences in air temperature were great, but diurnal changes during active photosynthesis (8:00-17:00) were small (about 2-5°C). Dark respiration was very closely related with night temperature. 3. Both on fine and cloudy days, photosynthetic rate changed with light intensity, but responses were less sensitive in lower leaves. However, on clear days, photosynthesis remained almost constant during 9:00 to 14:00, irrespective of the light intensity, excluding its sudden drop by cloud. The photosynthesis of the uppermost leaf was saturated at the incident light intensity of 70 klx ca., the lower leaves at 50 klx ca. and the middle leaves at the intermediate intensity. 4. The middle and lower leaves photosynthcsized ca. 60-70% and ca. 35-50% of the amount for the uppermost leat respectively, and the percentages were a little higher on cloudy days than on fine days. During night, they respired 80-90% and 50-60%, respectively, compared with the uppermost leaf (100%). The ratios of dark respiration to photosynthesis were about O.1 on clear days; but they were a little higher on cloudy days and for the lower leaves. The lowest leaves at the ripening period which were just prior to dying consumed during night less than half of the photosynthate produced during daytime even on cloudy days, suggesting that even those old leaves under strong shade may not be "parasitic" in the sense of consuming more than production.
机译：要了解水稻植物的寿命，更具体地，在现场条件下，在3个生长阶段（胰穗形成阶段，起动阶段和成熟阶段）中连续测量不同年龄的单个叶片的光合作用和呼吸速率7-8天讨论了与环境条件的关系。在夜间，在冠层中，在三层（80,50和20cm）的环境CO2浓度在夜间中高，可能是较低的风速非常低的relatcd。白天期间，中低层的CO 2浓度低于上层的高达25ppm，但是所有层在不同天或不同的季节中显示出几乎类似的CO2Cnclnntration模式，可能是由于空气充足的涌入进入树冠。 2.空气温度的日常或季节性差异很大，但活性光合作用时的昼夜变化（8：00-17：00）小（约2-5°C）。暗呼吸与夜间温度非常密切相关。 3.既美细和阴天的日子，光合速率都以光强度变化，但较低叶子的反应敏感。然而，在晴朗的日子里，光合作用在9:00至14:00期间仍然持续，而不管光强度，不包括云突然下降。最上面的叶片的光合作用在入射光强度为70kLx的情况下饱和。，下叶为50kLx。和中间叶处于中间强度。 4.中下叶片光学性CA. 60-70％和CA。分别为35-50％的最高底层的量，百分比在阴天的百分比上比晴天更高。在夜间，与最上面的叶子（100％）相比，它们分别呼吸80-90％和50-60％。对光合作用的暗呼吸的比率在晴天中约为o.1;但在阴天和下叶子的阴天和下叶子有点高。成熟时期的最低叶子在夜间消耗之前消耗的夜晚消耗不到白天在白天产生的光合素的一半，表明即使在强大的阴影下的那些老叶子也可能不是“寄生的”超过生产。

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