大武地区青海草地早熟禾人工草地生长动态研究

Study on growth dynamic changes of Poa pratensis cv.Qinghai pasture in Dawu area

对青海草地早熟禾人工草地生育期、盖度、高度和地上植物量年动态和4龄人工草地的季节动态进行了研究,结果表明:青海草地早熟禾生育期为134 d,生育期到第2年以后趋于稳定;盖度,高度和地上植物量年动态曲线呈倒"V"字型,地上植物量和盖度在2龄时达到了顶峰,分别为626.5 g/m2和94.7%;高度在3龄时达到最大,为74 cm,然后逐年下降;4龄青海草地早熟禾盖度,高度和地上植物量的季节动态曲线呈"单峰"型,盖度和高度在8月下旬达到最大值,分别为88.3%和70.6 cm,地上植物量干重的最大值为546.2 g/m2,出现在8月上旬。

The growth stage, coverage, height, aboveground biomass and growth dynamic changes of Poa pratensis cv. Qinghai were studied in a four years old sown pasture. The results show that its growth and reproductive duration lasted about 134 days and tend to be stable after the second year. The yearly dynamic curves of plant cover,height and aboveground biomass were all the reversed ＂V＂types. The coverage and aboveground biomass reached the highest i. e. 94. 7% and 626.5 g/m^2 respectively. The highest plant height i. e. 74 cm,appeared in the third year,then decreased year by year. The dynamic curve of cover changed with seasons,of Poa pratensis cv Qinghai and the curves of plant height and aboveground biomass were ＂one peak＂types. The highest coverage and plant height appeared during the last ten days in August i. e. 88.3% and 70.6 cm respectively. The highest dry weight of aboveground biomass i.e. 546.2 g/m^2 appeared in the first ten day period of August.