桃树不同留枝量对冠层参数变化及果实产量和品质的影响

Effects of different shoot amounts after pruning on canopy parameter variation and fruit yield and quality

应用HEMIDIG数字冠层分析仪研究6年生燕红桃树不同留枝量(1 029、918、774、542个)的冠层参数变化,以及不同留枝量对果实产量和品质的影响。结果表明:不同处理的总透光比、冠层下总辐射、冠层下总直射辐射、冠层下总散射辐射在5月6日至6月10日下降幅度较大,6月10日以后,呈缓慢下降趋势,每株留1 029个枝的参数均最小,每株留542个枝的参数均最大;而叶面积指数与总透光比等指标变化趋势相反。每株留918个枝的果实品质及单株产量均显著高于其它3个处理;通过传统方法测定叶面积指数及总透光比与冠层分析仪测定发现,冠层分析仪测定的叶面积指数及总透光比与传统方法呈极显著正相关,表明冠层分析仪可用于桃树冠层结构的研究。

In this article, 6-year-old Yanhong peach were took as study material. Effects of different shoot amounts(1029、918、774、542) after pruning on canopy parameter variation were studied by HEMIDIG digital canopy analyzer, and the effects of different treatments on fruit yield and quality were detected. The results indicated that the total light transmission ratio, the total scattered radiation under the canopy, the total direct radiation under the canopy, the total radiation under the canopy of each treatment declined greatly from May 6 to June 10(leaf formation period), then turn slowly after June 10. The parameter values of 1029 remaining branches per plant were the minimum in all periods, whereas the values of 542 were the maximum. Meanwhile, the leaf area index performed the opposite trend compared with the total light transmission ratio and the other indicators. The fruit quality and yield of the treatment with 918 remaining branches were significantly higher than that of the other three treatments. The values of leaf area index(LAI) and total light transmittance(LTR) measured by traditional method and by canopy analyzer were significantly positively correlated, which indicated that the canopy analyzer could be used to study the characteristics of peach canopy.