【摘要】 【目的】探明氮、磷和钾肥对2种决明（Chamaecrista）不同器官氮含量的影响。【方法】设置氮、磷和钾肥3种肥料5个施肥水平处理，研究不同施肥量下2种决明茎、叶、根和荚的氮含量，以及地上部和地下部氮累积量，评估氮累积量与施肥量及不同器官含氮量的关系。【结果】3种施肥模式下2种决明不同器官氮含量从高到低的顺序均为荚/叶>根>茎、地上部>地下部，施氮磷钾肥没有改变器官含氮量的大小顺序。适量施肥能提高2种决明荚、叶、根和茎的氮含量，对地上部和地下部氮积累也影响显著，其中36 kg·hm^-2的施氮处理和96 kg·hm^-2的施磷处理2种决明地上部和地下部氮积累量最大，60 kg·hm^-2的施钾处理圆叶决明（Chamaecrista rotundifolia）地上部氮积累量最大，120 kg·hm^-2的施钾处理羽叶决明（Chamaecrista nictitans）氮积累量最大。【结论】品种间植物各器官的含氮量的差异大于施肥处理；36 kg·hm^-2的施氮处理和96 kg·hm^-2的施磷处理2种决明氮积累量最大，60～120 kg·hm^-2的施钾处理氮累积量最大；2种决明植株氮积累量与生物量、茎和叶的含氮量正相关，与根含氮量负相关。更多还原

【Abstract】 【Objects】 Effects of NPK fertilizations on N-accumulation in organs of two Chamaecrista spp. were compared.【Method】 Five levels of N, P, and K fertilizer were applied in soil to determine the N contents in the stems, leaves, roots,and pods as well as the above-and under-ground parts of the Chamaecrista plants grown on the treatment soil to analyze their correlations. 【Results】 The N contents in the organs of the plants under varied fertilization treatments ranked pods or leaves > roots > stems or aboveground parts > underground parts. Appropriate amount of fertilizer significantly improved the N-accumulation in the organs as well as above-and under-ground parts. The greatest N-accumulation in the aboveand underground parts of the two Chamaecrista spp. occurred when either 36 kg·hm^-2 N or 96 kg·hm^-2 P was applied,while that in the aboveground parts of C. rotundifolia by 60 kg·hm^-2 K application and of C. nictitans by 120 kg·hm^-2 K.【Conclusion】 Different fertilizations exerted a less significant effect than the plant species did on the N-accumulation of Chamaecrista spp.The Chamaecrista SPP treated with 36 kg·hm^-2 of nitogen and 96 kg·hm^-2 of phosphorus showed the highest nitrogen accumulation, while those receiving potassium in the range of 60 kg·hm^-2 to 120 kg·hm^-2 also exhibited maximum nitrogen accumulation. The N-accumulation positively correlated with the biomass and N contents in the stems and leaves, but negatively with the N content in the roots.更多还原