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Preliminary results on the use of a modified point quadrat method for estimating canopy structure of grapevine training systems

机译：使用改进的点积分法估计葡萄训练系统的冠层结构的初步结果

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摘要

The reliability of a modified point quadrat method designed to describe the structure and seasonal canopy dynamics of the training systems simple curtain (SC) and traditional spur-pruned cordon (SPC) was tested in a two-year study. The method relies upon an unbiased sampling procedure as each canopy insertion is first identified within a ground-projected area by a random number generation routine (RND). From each insertion, the height of each contact with either leaves or clusters is then recorded along the vertical axis. Although the method suffered from a somewhat low percentage of effective insertions early in the season, the total leaf area-to-surface area ratio and the leaf layer number calculated for both canopy types are in accordance with those reported by others for high vigour canopies. Canopy dynamics showed an asymmetric growth in the SC starting at bloom. Both trellises resulted in similar canopy density indices and a high correlation was found between total leaf area and total numberof leaf contacts.
机译：在一项为期两年的研究中，测试了一种用于描述简单训练帘（SC）和传统正枝修剪警戒线（SPC）的训练系统的结构和季节性冠层动力学的改进的点积法的可靠性。该方法依赖于无偏采样程序，因为首先通过随机数生成例程（RND）在地面投影区域内识别每个树冠插入。从每次插入开始，沿垂直轴记录与叶子或簇的每次接触的高度。尽管该方法在季节初期的有效插入百分比较低，但针对两种冠层类型计算的总叶面积与表面积之比和叶层数与其他人针对高强度冠层所报告的一致。从开花开始，冠层动力学显示SC的不对称增长。两种格子都产生相似的冠层密度指数，并且在总叶片面积和叶片接触总数之间发现高度相关性。

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