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【摘 要】
：
本试验以黄金梨（Pyrus Pyrifolia. Nakai. cv. Whangkeumbae）和鸭梨（Pyrus bretschneider. Rehd. cv. Yali）为试材,对比研究了黄金梨和鸭梨叶片光合速率的日变化、季节变化及各种
【机 构】
：
河北农业大学
【出 处】
：
河北农业大学
【发表日期】
：
2005年01期
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