【摘要】 研究星星草人工草地地上部N、P、K、Na、Ca、Mg含量的季节动态及其在不同器官和不同株高的分布情况。结果表明，在生育期间，元素含量由大到小的顺序均为K＞N＞P＞Na＞Ca＞Mg。其中K、N、P、Na和Mg随着生育期的进程含量递减，而Ca在生育后期变化较小。供试元素积累量及积累速率的季节动态与生物量的变化趋势较为一致，即先升后降。在开花期后元素和干物质开始向根部运输。N在穗中最多，P、Ca、Mg在叶中最多，而K和Na则主要分布在茎中。近地面和茎的最上部元素含量相对较少。开花期为星星草最适合的收获期。更多还原

【Abstract】 Seasonal Dynamics of the contents of N,P,K,Na,Ca and Mg and their distribution in different organs and at different height were studied in the aboveground part of artificial population of Puccinellia tenuiflora. At different growth duration the content of the six elements shows K＞N＞P＞Na＞Ca＞Mg.The content of K,N,P,Na decreased with growing,and the content of Ca keep stable during the later period of growth.The seasonal changes of the accumulation and accumulative speed of the elements showed the same trend with the change of biomass,increase first and then decrease.The peak appears at blooming period.After then the accumulation of these nutrient elements stopped gradually and began to be transpor ted to the roots with nutrient substance.The distribution condition of these elements in different organs and at different height showed,N distribute mainly in ear,P,Ca,Mg mainly in leaves,and K,Na mainly in stem.At different height,there are smaller content of nutrient elements at the part of the very bottom and very top.According to the biomass and the content of nutrient elements the proper har vesting time for Puccinellia tenuiflora is blooming period.更多还原