Abstract: The effects of different utilization period on contents and accumulative rates of 11nutrient elements in artificial Trdelium pratense pasture on high elevation (1800m) area sichuan of the north subtripical sone in China are discussed in this paper.The chief results obtained are as follow: 1.The effects of utilizing T.pratense population in the different seasons, Mar.- May (Ⅰ), Jun.- Jul (Ⅱ) and Aug.- Sep.(Ⅲ) on its contents and accumulative rates of nutritive elements are as folfows: (1) Contents of N、P、Ca、Mg and Mn are Ⅰ <Ⅱ <Ⅲ, Na is Ⅰ > Ⅱ>Ⅲ, and K、 Cu、 Co are Ⅱ >Ⅰ >Ⅲ.Zn content is similar for Ⅰ,Ⅱ andⅢ.(2)Maximum accumulative rates of nutritive elements are Ⅱ >Ⅰ >Ⅲ.2.The effects of utilising T.pratense population in the different growing periods on its contents and accumulative rates of nufritive elements are as folows: (1) N、P、K、Cu and Zn content usually reduce gradually with growing and developing of T.Pratense.N、P、K、Cu and Zn contents of aftermath are lower, but Ca content is higher as compared with uncut herbage under the same groWing period.(2) Average accumulative rates of nutritive elements are lower as utilizing forage at early growing stage, then increase gradually with deferring utilizing Period.Average accumulative rates of determined an overwhelming major elernent, all are highest when the forage is utilized at Sqaring-flowering phase.

Key words: Trifolium pratense, Utilization period, Element content, Element accumulative rate

摘要： 本文研究不同利用期对四川巫溪县红地坝亚热带高海拔地区红三叶人工草地11种营养元素含量和积累速率的影响,结果如下:不同季节,即3～5月(Ⅰ)、6～7月(Ⅱ)和8～9月(Ⅲ),对红三叶营养元素含量和积累速率的影响如下:氮、磷、钙、镁.标的含量为Ⅰ<Ⅱ<大,钠为Ⅰ>Ⅱ>Ⅲ,钾、铜、钴为Ⅱ>Ⅰ>Ⅲ。锌的含量三者相近。营养元素最大积累速率出现的顺序为Ⅱ>Ⅰ>Ⅲ。红三叶在不同生育期对营养元素含量和积累速率的影响如下:随着生育期的后移,氮、磷、钾、铜、锌含量通常逐渐下降。在相同生育期的条件下,再生草与刈前比较,氮、磷、钾、铜、锌的含量较低,而钙含量较高。在生长初期营养元素的平均积累速率较低,但随着利用期的推迟而逐渐升高。在现蕾—开花期利用,大多数元素的平均积累速率最高。

关键词: 红三叶, 利用期, 营养元素含量, 积累速率