水平台阶式丰水梨冠层结构特点及其与果实品质的关系

Canopy Structure Characteristics of 'Hosui'Pear Tree Pruned by Horizontal Step System and Its Relationship with Fruit Quality

以大冠疏散分层形为对照,连续多年对丰水梨采取水平台阶式整形修剪,应用W inSCANOPY2005a冠层分析仪研究了该树形的冠层结构特点,分析了与其品质的关系,结果表明:水平台阶式丰水梨的冠层开度、树冠下散射光合光量子通量密度、平均叶倾角均显著高于疏散分层形;树冠下直射光合光量子通量密度和总光合光量子通量密度分别是疏散分层形的1.83和1.76倍;而水平台阶式梨叶面积系数极显著低于疏散分层形。水平台阶式丰水梨果实平均单果重、可溶性固形物、总糖、糖酸比值分别比疏散分层形的高23.39%、20.20%、18.75%和29.78%;总酸低8.50%。

Compared with the delayed-open central leader system（DLS）,the relationship between Canopy Structure Characteristics and fruit quality were studied in 8 years-old of ＇Hosui＇ pear tree pruned by the horizontal step system technique（HSS）.The results showed that canopy openness, indirect PPFDs and mean leaf angle under tree were significantly higher in HSS than that in DLS,but direct PPFDs and total PPFDs under tree were higher by 83 %,76 % respectively.The leaf area indexes were significantly lower in HSS than that in DLS.Single fruit weight,total soluble solid,total sugar and sugar-acid ratio from HSS were higher by 23.39 %,20.20 %,18.75 % and 29.78 %,respectively. Whereas,total acid was lower by 8.50 % than that from DLS.