| 灌溉条件下不同紫花苜蓿品种生长动态模型及其类型 |
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| 引用本文： | 祁翠兰,武得礼.灌溉条件下不同紫花苜蓿品种生长动态模型及其类型[J].草业科学,2017,34(3). |
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| 作者姓名： | 祁翠兰 武得礼 |
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| 作者单位： | 甘肃省景泰县农牧局,甘肃景泰,730400;兰州大学草地农业科技学院,甘肃兰州,730020 |
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| 摘 要： | 研究了灌溉条件下15个紫花苜蓿(Medicago sativa)品种二年龄第一茬草的生长动态,其动态模型符合Logistic生长曲线;各品种之间的回归模型有明显差别。依生长曲线方程计算了各品种的最高产量潜力(K),最大生长速度(Vmax)、生长最快时间(t)、生长速度由慢变快的突变点(t1)和由快变慢的突变点(t2)、旺盛生长期(t2-t1)和生长特征值(GT)。t2可作为刈割始期的指标,供生产中参考应用。对这些特征值进行了偏相关分析,表明苜蓿产量潜力的大小取决于旺盛生长期和最大生长速度二者的乘积。以这些特征值为依据进行了聚类分析,第二类品种(金皇后、巨人201、德宝、三得利、维拉和瑞西)表现良好,宜在当地推广种植,刈割始期为5月17日。
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| 关 键 词： | 紫花苜蓿 生长曲线 聚类分析 刈割始期 |
Growth model and classification of different alfalfa varieties under irrigation conditions |
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| Qi Cui-lan,Wu De-li.Growth model and classification of different alfalfa varieties under irrigation conditions[J].Pratacultural Science,2017,34(3). |
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| Authors: | Qi Cui-lan Wu De-li |
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| Abstract: | The growth model for 15 varieties of alfalfa as the first crop in the second year under irrigation conditions was investigated.The results showed that the growth model was consistent with the logistic growth curve.There were obvious differences in the regression models of varieties.Based on these models,the highest potential yield (K),maximum growth speed (Vmax),time of maximum growth (t),turning point of growth speed from slow to fast,and that of fast to slow (t1,t2),the period of vigorous growth (t2-t1),and growth characteristic values (GT) were calculated.The variable t2 can be used as an index to the time to begin harvest with reference to production.Partial correlation analysis showed that the potential yield of alfalfa was determined by the product of days of vigorous growth and maximum growth speed.According to the values,the varieties were clustered into five types.The second classification varieties (Golden Empress,Ameristand 201,Derby,Sandili,Vela,and Rest) are appropriate for local planting with harvest beginning on May 17. |
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| Keywords: | alfalfa growth curve cluster analysis beginning time for harvest |
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