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通过测定得知:稀植树在日照较长的夏季净光合强度日变化曲线比常规的双峰曲线多一高峰,即在中午出现一小高峰,故为三峰曲线型。密植园栽植密度较大时,中午净光合强度常出现负值。地势较低的园片常因通风不良、气温增高,致使呼吸强度加大,净光合强度减低。在夏日树冠稀疏的丛状形整枝树,树冠内部枝叶由于有外部枝叶的遮护,温度较低,因而比树冠外部净光合强度较高。
The results showed that the diurnal variation curve of net photosynthesis intensity of sparsely planted trees in summer with longer sunshine was more than that of the conventional double peak curve, that is, a small peak occurred at noon, so it was a tri-peak curve type. Close planting density planting density, noon net photosynthetic strength often negative. Low-lying disc often due to poor ventilation, the temperature increased, resulting in increased respiratory intensity, reduced net photosynthetic intensity. In the summer crown thin sparse pruning tree branches inside the crown due to the external branches and leaves of the shelter, the lower the temperature, and therefore higher than the outer net photosynthetic crown intensity.