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【目的】拉枝对直播密植枣园树体生长、光环境以及枣果产量和品质的影响。【方法】对参试株干径和基径进行调查,分析拉枝处理与对照的生长量差异;采用LAI-2000冠层仪和照度计进行行间叶面积指数、株间透光率及树冠中部光照强度日变化进行测定;果实成熟期用蒽酮法、氢氧化钠滴定法和钼蓝比色法分别测定其总糖、总酸和VC的含量。【结果】(1)拉枝处理的干径生长量小于对照,基径生长量则高于对照,差异达显著水平;(2)拉枝处理后行间叶面积指数较对照提高119.0%,株间透光率较对照提高1倍;(3)拉枝后树冠中部光照强度日均值为334.70 lx,对照仅为101.01 lx,光环境明显改善;(4)拉枝后单果重和单株产量与对照差异达极显著水平,品质差异不显著。【结论】在不减少密植枣园有效株数的前提下,株间拉枝方式改善树体光照环境和枣果品质,提高枣果产量和经济效益。
【Objective】 The effect of pulling branches on the tree growth, light environment and jujube fruit yield and quality of direct-sowing jujube orchard. 【Method】 The dry diameter and the base diameter of the tested plants were investigated to analyze the difference of growth between the pull-out treatment and the control. The LAI-2000 canopy and the illumination meter were used to determine the inter-leaf area index, The changes of light intensity were measured in the middle part of the fruit. The contents of total sugar, total acid and VC were determined by anthrone method, sodium hydroxide titration method and molybdenum blue colorimetric method respectively. 【Result】 The results showed that: (1) The diameter of stem diameter growth of pull-off treatment was less than that of control and the growth of base diameter was higher than that of control. (2) The inter-leaf area index increased by 119.0% (3) The average daily light intensity of middle canopy after crown was 334.70 lx, the control was only 101.01 lx, the light environment improved obviously; (4) The fruit weight per plant and yield per plant The control difference reached a very significant level, the quality difference is not significant. 【Conclusion】 Under the premise of not reducing the number of effective plants in close planting jujube orchard, the way of inter-plant pull improves the light environment of the tree and jujube quality, and increases the yield and economic benefits of jujube.