云南低纬高原区与玉米间作的大豆品种耐荫性评价
- Title:
- Evaluation of Shade Tolerance of Soybean Intercropping with Maize in Low Latitude Plateau Area of Yunnan Province
- 摘要:
- 为评价云南地区不同大豆品种和玉米间作条件下的耐荫性,以云南省农业科学院粮食作物研究所选育的13个大豆品种为参试材料,在天然遮荫环境中与玉米带状间作复合种植,选择合适的耐荫鉴定指标,构建大豆耐荫评价模型,系统评价其耐荫性。通过相关性分析、主成分分析等多元分析方法,对11个测定性状指标的耐荫系数进行统计分析,系统评价参试材料的耐荫性和产量。结果表明:运用主成分分析,将各测定指标耐荫系数转化为4个无耦合的综合指标,覆盖了84.442%信息量;运用系统聚类,将13个育成品种按隶属函数分析所得的综合耐荫性评价值(D值)分为3类:弱耐荫型(2个品种)、中等耐荫型(8个品种)、强耐荫型(3个品种);进一步运用逐步回归法构建耐荫性评价回归模型:D=-0.878+0.973X1+0.754X7-0.072X11-0.128X2,R=0.995,调整后R2=0.986,残差的标准差为0.020 56。利用该方程得出,根据株高、单株粒数、倒伏等级、底荚高度这4个指标能有效鉴定云南大豆玉米带状复合种植下的大豆耐荫性。强耐荫品种云黄22、云黄20及中耐荫品种云黄13在间作条件下单株产量较高,适宜用于云南地区(低纬高原)与玉米等作物间作。中耐荫品种云黄17在净作条件下具有较好的产量表现,更合适用于云南省大豆净作生产。
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