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canopy structure
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  canopy structure
The results show that small-diameter Korean pines' origination and growth have close relations to the overstory canopy structure dynamics and play an important role in the maintenance and development of Korean pine forest.
      
Canopy structure would influence DTS and DCR across canopy-atmosphere interface remarkably.
      
deltoides, was used to evaluate the genetic basis of canopy structure and function in a clonally replicated plantation.
      
Canopy structure, shoot design, and photosynthetic light recruitment were used to compare four coexisting dwarf shrub species with respect to light utilization.
      
Canopy structure and physiology of paper birch are examined in the field during two growing seasons.
      
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he Center-of-Pressure technique (CPT), originally proposed by Thorn in 1971, is firstly verified in the field, based on the canopy architecture and microclimate data of four crops. The comparison of u* estimated by CPT with that by eddy-correlation method shows that CPT not only works well in the field, but also gives more steady and accurate results, which are hardly affected by atmospheric stratification stability, than that of the log-profile fitting method which is frequently used in practice. In addition,...

he Center-of-Pressure technique (CPT), originally proposed by Thorn in 1971, is firstly verified in the field, based on the canopy architecture and microclimate data of four crops. The comparison of u* estimated by CPT with that by eddy-correlation method shows that CPT not only works well in the field, but also gives more steady and accurate results, which are hardly affected by atmospheric stratification stability, than that of the log-profile fitting method which is frequently used in practice. In addition, a physical model for directly calculating d is approximately developed. The results yield that the ratio of d, z0to h, in general, varies with the canopy structure, turbulence intensity and the stability of flow above and within the canopy; d/h increases with the increase of a (the relative height of the maximum foliage density layer) and γu (the wind extinction coefficient within canopies ). Only for short stem ctops and when their canopies reach the moderate foliage density and stable structure, d and z0 approximately and steadily approach to 0. 64h and 0. 08h, respectively. Besides, concerned with very sparse or tall crops, the fairly large stresses at the soil surface and variability of m undoubtedly influence the accuracy of CPT to a certain extent.

利用小麦、水稻、大豆及玉米作物叶面积密度和冠层内外风廓线等的实测资料,作者首先在大田条件下根据压力中心法计算了上述农田的空气动力参数,并导出了一个计算零平面位移(d)的物理模式。通过与实测资料的比较得出,压力中心法不仅完全可以用于野外的大田作物,而且结果的稳定性基本上不受大气层结的影响,精度在非中性层结下通常高于常用的对数廓线法和拽力系数法。本文结果还表明,通常情况下d,Z0与作物高度(h)之比值是随作物群体结构和大气层结、湍流状况等的不同而变化的,而不是人们所普遍接受的常数值。随群体中最大密度层的相对分布高度和风速递减指数的增大,d/h增大。只有对于矮杆的大田作物,在其群体处于中等密度时,以下关系d≈0.64h,Z0≈0.08h才较稳定。对于高杆作物或密度稀疏的群体,土壤表面湍流通量的增加以及叶子的拽力系数随风速的变化指数的选取都对压力中心法的结果产生一定的影响。

Based on the theory of relation between crop canopy structure and gap fraction in canopy ,an indi-rect method for estimating crop leaf area index(LAI)and leaf angle distribution were developed in thispaper. Using the method, the gap fraction in canopy could be calculated by observing transimittance ofgloble solar radiation,and LAI and its distribution in different leaf angle intervals could be estimatedthrough a simple mathematical model.The method has been tested for two crops,maize and oilseedrape,and...

Based on the theory of relation between crop canopy structure and gap fraction in canopy ,an indi-rect method for estimating crop leaf area index(LAI)and leaf angle distribution were developed in thispaper. Using the method, the gap fraction in canopy could be calculated by observing transimittance ofgloble solar radiation,and LAI and its distribution in different leaf angle intervals could be estimatedthrough a simple mathematical model.The method has been tested for two crops,maize and oilseedrape,and the result shows that the accuracy of the method is high enough for practical application。

设计了一种由作物冠层的辐射分布推算作物叶面积指数(LAI)和叶倾角分布函数的方法。根据作物冠层中太阳光斑密度与群体结构关系的数学表达式,LAI及其在各个叶倾角区间的分布可由不同太阳高度角时冠层内的光斑密度进行估计,而后者可通过观测冠层中的太阳总辐射和散射辐射的分布进行计算。因此,由容易测得的冠层总辐射的透过率,应用与多元回归分析类似的简单方法,就可以估算出难以直接测量的LAI和叶倾角分布函数。用对玉米和油菜进行的实测检验结果表明,推算精度可以满足实际应用的需要。

Field experiments performed in Nanjing area show that enhanced UV B radiation causes marked variations in canopy structure of wheat and in turn affects the canopy's light reflectance and absorption. Investigation has been conducted in detail and quantitatively on the variations of the structure and with possible mechanism under discussion.

南京地区小麦田间紫外辐射试验表明 ,紫外辐射量的增大能显著影响小麦的群体结构 ,进而影响小麦对紫外辐射的反射与吸收。本文从小麦群体结构的角度对上述影响进行了详细的量化分析 ,并对产生这种影响的可能机制进行了探讨。

 
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