果树合理密植应根据树体特性、自然环境和栽培技术,既节约用地,又合理利用空间和光能,充分发挥整个叶幕的光合生产能力,达到丰产、稳产、优质、低耗费之最终目的。果树之间的遮光主要决定于树体大小、栽植密度、坡度α、坡向β、纬度φ、太阳视赤纬δ及时角ω等因素。各种果树必须的受光条件可依据其光合作用的需光情况来确定。在传统的果树栽培中,仅凭经验决定果树栽植密 Fruit tree reasonable close planting should be based on tree characteristics, natural environment and cultivation techniques, both to save land, but also the rational use of space and light energy, give full play to the entire leaf curtain photosynthetic production capacity to achieve high yield, stable yield, high quality, low cost ultimate goal. The shade between the fruit trees is mainly determined by factors such as the size of the tree, the planting density, the gradient α, the slope β, the latitude φ, the sun’s declination δ and the angle ω. A variety of fruit trees must be light conditions based on their photosynthesis needs to determine the situation. In the traditional cultivation of fruit trees, fruit trees planted densely based on experience alone