雨棚是根据相对于墙体面积的叶面积指数(LAI)来测量的；每单位LAI，日照减少约一半。

Canopy is measured according to leaf-area-index (LAI) relative to wall area; for each unit of LAI, sunlight decreases by about half.

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由与叶面积显著相关的多个性状组成的选择指数，选择的相对效率最高。

The selection index made up of several properties and conditions remarkably correlative with the leaf area has the highest relative efficiency of selection.

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