白羊草灌丛草地植物量及优势种牧草营养动态研究

对白羊草灌丛草地优势种牧草的营养动态和草地植物量的动态变化进行了研究。结果表明:(1)牧草随着生育期的延续,植株变老,粗蛋白质(CP)和粗灰分(Ash)含量逐渐降低,而中性洗涤纤维(NDF)则呈相反的趋势。豆科牧草与铁杆蒿的CP以现蕾期为转折点,禾本科牧草则在开花初期CP含量较高。(2)白羊草灌丛草地地上植物量呈“单峰”曲线,高峰期出现在8月份,地下植物量曲线以9月份为峰值,其中0~10 cm占80%以上,总植物量也以9月份为最高。

Dynamic of phytomass and its nutrients of Bothriochla ischaemum shrubland

The dynamic of phytomass and nutrients of old world bluestem(Bothriochloa Ischaemum)shrubland in different growth stages were studied.The results showed that the contents of CP,Ash declined gradually with the growth stage,on the contrary,the content of NDF increased.The contents of CP in legumes changed markedly at the bud stage and it was at early blooming stage for grasses.The dynamic curve of aboveground phytomass showed a single peak in August.For underground phytomass,it showed the highest peak in September and the proportion within 0~10 cm accounted for more than 80%,meanwhile,the total phytomass was the largest in September.