However, because of difficulties in measuring light attenuation in canopy gap and complex structure of forest canopies.
但是、由于林隙结构极为复杂，难以精确地测量林隙上方和周围树冠空隙的透光情况。
Tree crown form and canopy structure of the tussah-feeding oak forest are important influencing the photo-productivity of the stands.
柞蚕场的树冠类型和冠层结构是影响蚕场光合生产力的主要因素之一。
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