氮素对蕨麻克隆构型的可塑性反应

试验研究N素对蕨麻克隆构型的可塑性反应结果表明,蕨麻基株根长、分枝数、分株数、间隔子、地上干物质量、地下干物质量随N素的增加呈二次曲线变化,在施纯N 90.0kg/hm2时出现拐点,说明蕨麻对异质性资源(土壤N素)具有较强的可塑性。蕨麻总分枝长、根系膨大率、球根率则随N素水平的增加而直线下降,表明施用N素后蕨麻块根不具有商品价值。进行生态恢复时施用一定量N肥能显著提高蕨麻地上部分的生长,增大植被覆盖率。

Plasticity of clonal architecture of Juema in response to nitrogen element

The plasticity of clonal architecture of Juema in response to N element was studied.The results show that the root length of genet,branch number,ramet number,spacer,shoot dry weight and root dry weight show a Conic curve with the increase of N element,and when 90.0 kg/hm~2 of N element is applied an inflexion appears,showing that Juema has plasticity in response to heterogeneity resource of N element.The changes of total branch length,expending rate of root and ball root rate decline with the increase of N element,which shows that after using N,the root tuber of Juema has not a commercial value.After the renew of ecology,the proper N fertilizer can boost the shoot weight and vegetation covering rate.