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From population level to functional group level, and then to community level, the yearly-variation of aboveground biomass minimizes gradually and stability increases.
从植物种群水平、植物功能群水平到群落水平，地上生物量的年度间变异性逐渐降低，稳定性逐渐增加。
Water culture experiment was carried out with winter wheat at the tillering stage to study the influence of nitrogen level on some nitrogenous substances and biomass of wheat.
利用水培研究了氮素水平对冬小麦分蘖期某些含氮化合物及生物量的影响。
The main results were as follows: 1. Plant height, culm thickness and biomass per plant were correlated to the lodging index at the 1% level of significance.
倒伏指数与株高、地上部生物量、茎粗的相关系数均达1%显著水平，表明水稻倒伏指数受株高、地上部生物量和茎粗等性状的显著影响。
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