较少或过多施用氮素降低了秧苗根系活力和保护酶活性，影响秧苗生长和生理优势。
Little or excessive nitrogen fertilizer application decreased roots vigor and protection enzyme activity and reduced growth and physiology superiorities of dry seedbed seedlings.
在鼎湖山自然保护区的原始地带徒步前进，沿途观察亚热带的植物，尤其是树木间错综复杂的根系。
Walked in the Dinghu Natural protection area, observing the semi-tropical plants, especially the complex root of trees.
烟草根系腐解物处理增加了烟草中MAD含量和保护酶POD活性，与烟草生长相关酶的活力则表现为先升高后降低。
Treatment by decomposition from tobacco roots increased content of MAD and protected activity of POD and the activity of growth-related enzymes was at first increased and then decreased.
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