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遮荫宽度
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  shadow width
     On the basis of the field observation data,with the principle and method of agricultural meteorology,the daily variation laws of the shadow width of the jujube tree belts and the relative sunshine intensity were analysed in the system of jujube-wheat interplanting;
     本文应用农业气象学原理和方法,根据实测资料,计算分析了枣麦间作系统中枣树带遮荫宽度及荫影内的相对光照度的时空变化规律;
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  相似匹配句对
     (4)water width of river;
     4)水体宽度;
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     The height, α, and the width, b, of the superledges are about 320—850 and 1500—1800 A respectively.
     ,宽度b为1500—1800(?)
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     A STUDY ON TREE SHADOW MOVEMENTS
     树冠遮荫动态研究
短句来源
     In shading conditions,the growth pattern of leaf width was a single″S″and the leaf growth period became longer.
     结果表明:遮荫条件下叶片宽度生长模式呈双峰型,叶片生长时间延长。
短句来源
     AN INVESTIGATION ON SHADING EFFECT OF AVENUE-TREE
     关于行道树遮荫效果的研究
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  shadow width
We investigate the behaviour of a liquid jet stimulated by pressure disturbances using a photometric measurement of the jet shadow width.
      
The size distribution was estimated from the shadow width of vesicles which were exposed by etching and the vesicle shape was checked by comparing the images obtained by tilting the replicas.
      


On the basis of the field observation data,with the principle and method of agricultural meteorology,the daily variation laws of the shadow width of the jujube tree belts and the relative sunshine intensity were analysed in the system of jujube-wheat interplanting;and the characteristics of the sunshine vertical distribution within the wheat colony inside and outside the shadow was studied.According to mathematical methods,the sunshine vertical distribution curves in the wheat colony inside and outside the shadow...

On the basis of the field observation data,with the principle and method of agricultural meteorology,the daily variation laws of the shadow width of the jujube tree belts and the relative sunshine intensity were analysed in the system of jujube-wheat interplanting;and the characteristics of the sunshine vertical distribution within the wheat colony inside and outside the shadow was studied.According to mathematical methods,the sunshine vertical distribution curves in the wheat colony inside and outside the shadow were simulated.The results show that the shadow area of the south-north planting jujube tree belts are fairly wider and the relative sunshine intensity is larger in early morning and late afternoon than at about noon;though the sunshine vertical distribution in the wheat colony are obviously different inside the shadow to outside the shadow,they both comply with Gauss Curve decreasing laws.

本文应用农业气象学原理和方法,根据实测资料,计算分析了枣麦间作系统中枣树带遮荫宽度及荫影内的相对光照度的时空变化规律;以及遮荫区、非遮荫区内小麦群体的光能铅直分布特点。应用数理方法,模拟了遮荫区及非遮荫区内小麦群体光能铅直分布曲线。结果表明,南北走向的枣带每天早、晚其遮荫区域较宽,相对光照度较大,中午前后,遮荫区域较窄,相对光照度较小;尽管遮荫区与非遮区内小麦群体的光能铅直分布有明显的差异,但二者都附合高斯曲线的递减规律。

The day changes of the sun-shading width in rice with different row directions in the areas of different latitudes and seasons during the summer half-year on northern hemisphere were calculated by using geometric model. The W-E row in the areas of low and middle latitudes and the N-S row in the areas of high latitudes showed a narrower sun-shading width and better sunlight utilization.

通过几何模拟 ,从理论上分析了北半球夏半年不同行向水稻遮荫宽度在不同纬度、不同季节的日变化 ,结果表明 :中、低纬度地区东西行向遮荫宽度较小 ,有利于群体充分利用光能 ,而高纬度地区则以南北行向有较大优势。此外 ,还讨论了行向、行距与光能利用的关系。

On the basis of field observation and with the principles and methods of agricultural meteorology,the daily variations of the shadow width of jujube tree belts and the relative light intensity were analyzed in the jujube—wheat interplanting system,and the characteristics of vertical distribution of the light within the wheat canopy inside and outside the shadow were studied. The sunshine vertical distribution curves in the wheat canopy inside and outside the shadow were simulated by mathematical methods. The...

On the basis of field observation and with the principles and methods of agricultural meteorology,the daily variations of the shadow width of jujube tree belts and the relative light intensity were analyzed in the jujube—wheat interplanting system,and the characteristics of vertical distribution of the light within the wheat canopy inside and outside the shadow were studied. The sunshine vertical distribution curves in the wheat canopy inside and outside the shadow were simulated by mathematical methods. The results showed that the shadow area of the south north planting jujube tree belts was fairly wider,but the relative light illuminance was larger in early morning and late afternoon than at about noon.Although the sunshine vertical distribution in the wheat canopy inside and outside the shadow was obviously different,they both observed the decreasing law for Gauss Curve.

应用农业气象学原理和方法 ,依据实测资料 ,分析了枣麦间作系统中枣树带遮荫宽度及阴影内的相对光照度的时空变化规律 ,以及遮荫区、非遮荫区内小麦群体的光能垂直分布特点 ;应用数理方法 ,模拟了遮荫区及非遮荫区内小麦群体光能垂直分布曲线 .结果表明 ,南北走向的枣树带每天早、晚其遮荫区域较宽 ,相对光照度较大 ;中午前后 ,遮荫区域宽度较窄 ,相对光照度较小 .尽管遮荫区与非遮荫区内小麦群体的光能垂直分布有明显的差异 ,但二者间都符合高斯曲线的递减规律

 
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