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以单作为对照,通过大田试验研究了间作时期及种植密度对甜瓜/向日葵间作系统土地利用率及光能利用率的影响。结果表明:各间作处理的土地当量比(LER)都大于1,说明甜瓜/向日葵间作显著提高土地利用率。除甜瓜定果期间作外,其他间作处理的光能利用率都显著大于甜瓜单作;除甜瓜45cm株距间作外,其余间作处理的光能利用率均显著小于单作向日葵。甜瓜/向日葵间作能明显提高间作系统的叶面积指数,种植密度对叶面积指数也有影响。调整间作期能延长单位面积的光合时间,增加干物质累积,提高光能利用率。叶日积与光能利用率之间呈二次抛物线关系,当作物群体密度增大时,叶日积和光合产物累积量都增大,但密度增长到峰值时,叶日积继续增大不能增加光合产物积累量。
The effects of intercropping periods and planting densities on the land use efficiency and light energy utilization efficiency of melon / sunflower intercropping system were studied by single field as a control. The results showed that the land equivalent ratio (LER) of all treatments was greater than 1, indicating that the melon / sunflower intercropping significantly increased land use efficiency. Except for melon and fruiting period, the light utilization efficiency of other intercropping treatments were significantly higher than that of melon monocrops. The light utilization efficiency of other intercropping treatments except melon 45 cm was significantly lower than that of monoculture. The melon / sunflower intercropping significantly increased the leaf area index of the intercropping system, and the planting density also had an influence on the leaf area index. Intercropping can prolong photosynthetic per unit area, increase dry matter accumulation and increase light energy utilization. Leaf daily product and light energy utilization rate showed a quadratic parabola relationship. When the density of crop population increased, the accumulation of leaf daily product and photosynthetic products increased, but the density increased to the peak, Increase photosynthetic product accumulation.