施氮量和密度对燕麦叶片C、N、P化学计量特征的影响

为分析科尔沁沙地燕麦养分限制状况,本研究测定了不同密度和施氮量处理条件下燕麦(Avena sativa)叶片C、N、P含量,并计算了C/N、C/P和N/P值,探讨密度和施氮量对燕麦叶片C、N、P化学计量特征的影响。结果表明:随施氮量的增加,叶片中C、N、P含量呈现不同的变化规律,其中N含量呈先降低后升高的变化趋势;随密度的增加,C、 N、 P含量总体呈逐渐降低的变化趋势。不同施氮量下,叶片C/P值在7.11～19.80, C/N值在1.95～4.13, N/P值在4.94～12.13;在不同种植密度时C/P值在7.11～17.66, C/N值在1.64～2.80, N/P值在2.56～12.18。在施氮量和密度互作时,N/P值在2.45～9.57,燕麦生长受N限制。

Effects of nitrogen application rate and density on the stoichiometric characteristics of C,N,and P in oat leaves

By measuring the contents of C,N,and P in oat leaves under different densities and nitrogen applications,and calculating the ratios of C/N,C/P,and N/P,the effects of density and nitrogen application on the stoichiometric characteristics of C,N,and P in oat leaves were discussed.This study aimed to provide a reference for exploring the nutrient limitations of oat leaves in the Horqin Sandy Land.The results showed that the C,N,and P contents in the leaves varied with the increasing nitrogen application,in which the N contents first decreased and then increased.With the increasing density,the contents of C,N,and P showed a gradually decreasing trend.Under different nitrogen application rates,the ranges of leaf C/P,C/N,and N/P were 7.11~19.80,1.95~4.13,and 4.94~12.13,respectively.At different planting densities,the ranges of leaf C/P,C/N,and N/P were 7.11~17.66,1.64~2.80,and 2.56~12.18,respectively.When the amount of applied nitrogen and density interact,the N/P ratio was between 2.56 and 14.18,and the growth of the oats was restricted by N.