外施不同浓度KH_2PO_4营养液对4年生‘中红杨’叶色的影响

Effect of applying KH_2PO_4 nutrient solution at different concentrations on leaf color of 4-year-old Populus×euramericana‘Zhonghong’

为了研究KH_2PO_4营养液对4年生‘中红杨’叶色的影响,测定了不同间隔天数、不同浓度KH_2PO_4营养液处理后叶片及对照叶片中叶绿素、类胡萝卜素、花色素苷和可溶性糖等含量。结果表明:间隔15 d叶面喷施7‰KH_2PO_4营养液能够显著提高‘中红杨'叶片中花色素苷、可溶性糖含量,而叶绿素、类胡萝卜素含量显著降低,有效提高了4年生‘中红杨'叶色的观赏价值。

Different-concentration KH2 PO4 nutrient solutions were applied to 4-year-old Populus＇ euramericana ＇Zhonghong＇ trees at different intervals of 5,10 and 15 days,and their leaves＇ chloro- phyll, carotenoid, anthocyanin and soluble sugar contents were determined. The results showed that leaf spray application of 7‰ KH2PO4 nutrient solution every 15 days could significantly increase the anthocyanin and soluble sugar contents but significantly decrease the chlorophyll and carotenoid con- tents,thus effectively improving the ornamental value of the 4-year-old trees＇ leaves.