一年生幼苗的年生长规律。
地径和苗高年生长节律表现为慢-快-慢的“S”型生长规律。
For all poplar clones, annual growth rhythm accorded with "S" curve both in seedling height and ground diameter.
从生长和开花结果规律看，它并非多年生植物，而是越年生植物，只是在营养积累不够时植株不开花。
On the observation of growth regulation, blossom and seed bearing, the herb was not perennial plant, but was the over-year living plant.
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