【摘要】 在连续 2a处理的基础上 ,于 1999年秋集中观察了草群、羊草和贝加尔针茅生长状况的变化。结果表明 ,经过 2次重复处理之后 ,累加效应显著。草群和主要种的高度、盖度随处理时间的推移和留茬高度的降低而呈直线或波动性下降 ;单位面积羊草植株数和单位株丛贝加尔针茅植株数也以相同的方式减少。下降和减少的程度比第 1a处理后加大。与CK相比 ,所有时间和留茬处理的生长指标都明显降低 ,揭示了不同利用方式对草地的不同影响。更多还原

【Abstract】 Based on two years cutting treatments,some changes on the growth status of community,Stipa baicalensis and Leymus chinensis were observed in middle September,1999.The results showed that after two years treatment the accumulated effects were significant.The heights and coverage of community and dominated specied sharply or unevenly descendedwith treating time-going along from spring to autumn or with stubble heightsfrom 5cm to 1cm.The plant numbers of Leymus Chinensis in unit area and Stipa baicalensis per bunch decreased in the same pattern.The degree of descending and devreasing showed grea than that observed in the first year`s autumn.Compared to the CK,nearly all growth items showed significant falling.So the influences of different utilization ways on the steppe were revealed.更多还原