摘要
对８种苜蓿在生长季内三次刈割各茬苜蓿高度生长动态的研究，结果表明：在生长季内，各连高度生长呈“Ｓ”型增长，并符合逻辑斯蒂模型．确定了各茬苜蓿高度生长最大速度值和两个时间特征值．此外，不同茬次苜蓿高度生长速度呈明显差异，二茬苜蓿高度生长速度最快，达到最大生长速度所用的时间最短；同一茬苜蓿高度生长速度在不同年度的差异不明显．该研究为苜蓿的管理和利用提供理论依据．
This paper studied the height growth dynamics of eight species Medicago sativa by mowing three times during one year. The result showed that the height growth rates of Medicago sativa of the different crop order appeared as 'S' form during one year,and coincided with Logistic model. The maximum rates and two time characteristic values of them were calculated. In addition, the height growth rates of Medicago sativa of the different crop order were different strikingly. The height growth rates of the second crop order were the fastest, and the time the second crop order needed to reach the maximum growth rates was the shortest. The differences of growth rates of the same crop order were not striking in the different year.The study provided a theoretic evidence for the management and utilization ofMedicago sativa.
基金
农业部科研基金
关键词
苜蓿
高度生长动态
逻辑斯蒂模型
牧草
刈割
three times mowing Medicago sativa height growth dynamicsLogistic model
