苹果梨田间光合生产特性的初步研究

THE PHOTOSYNTHETIC PRODUCTIVE CHARACTERISTICS OF APPLE-LIKE PEAR UNDER FIELDCONDITION

本文主要研究了吉林省梨主栽品种“苹果梨”田间条件下光合强度的变化规律。结果表明,“苹果梨”光合强度在7～16mgCO_2dm^(-2)h^(-1)之间,光补偿点为2klx,光饱合点为53klx。生长季中光合强度6月旬中达到高峰并一直持续到7月末。一日间的光合强度依光照强度和温度而变化,呈现出“正规曲线型”和“午睡型”。

The photosynthetic productive characteristics of apple-like pear was determined under field condition. The results indicated that the photosynthetic rate of pear ranged 7 to 10 mgCOjdnv, h'1. Light saturation point of photosynthesis was about 53 k/x, which the compensation point was about 2 k/x. The highest photosynthtic rate in the growing season occured at the middle of June, which continued to the end of June. The photosynthetic rate in a day varied with tempera- ture and light intensity and had two different type curves, of them one was the regular, and another declined at noon. The suitable temperature for the photosynthesis of apple -like pear was 25 to 29 'C.