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Though in the face of selection against self-pollina-tion, mixed pollination systems are maintained in many plants. The ......
根据田间调查材料,分别以Holling圆盘方程、Hassell和Vailey模型及Hassell和Roger模型分析了中华蜜蜂对草莓花朵密度的功能反应,对自......