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。

Tree crown form and canopy structure of the tussah-feeding oak forest are important influencing the photo-productivity of the stands.

youdao

群体光合作用和衰老特性的差别主要在组合间，而不在两系和三系两种类型之间，两系杂交稻未有明显的优势。

Significant differences were observed within the same kind of hybrid rice but not between the two kinds of hybrids, so did for the canopy photosynthetic rate of these hybrids.

youdao

群体光合作用和衰老特性的差别主要在组合间，而不在两系和三系两种类型之间，两系杂交稻未有明显的优势。

Significant differences were observed within the same kind of hybrid rice but not between the two kinds of hybrids, so did for the canopy photosynthetic rate of these hybrids.

youdao