高丛、半高丛、矮丛越桔和红豆越桔光合作用特性比较研究

从高丛、半高丛、矮丛和红豆4种类型越桔中各选一代表品种研究其叶片光合作用特性,结果表明,它们的光合作用年变化均呈一双峰曲线,高丛和半高丛越桔第一次高峰出现在7月初,矮丛和红豆越桔出现在7月中旬,第二次高峰均出现在8月下旬。高丛、半高丛和矮丛越桔春季展叶后光合强度较高,9月中旬以后随着叶片变色老化迅速下降,而红豆越桔展叶后(5月26日～6月20日)光合强度较低,9月中旬以后仍维持一定水平的光合强度。光饱和点和光补偿点表现为高丛>半高丛>矮丛>红豆;呼吸强度则相反。光合速率以高丛和半高丛高于矮丛和红豆越桔。

A Comparison Studies of Photosynthetic Characteristics of Highbush,Half-highbush, Lowbush Blueberry and Lingonber-ry

Seasonal variation of photosynthetic rate of highbush, half-highbush, lowbush and lin-gonberry were presented a two-peak parttern. The first peak reached in early July for highbush and half-highbush, and reached in mid-July for lowbush and lingonberry. The photosynthetic rate of highbush , half-highbush and lowbush were high in early spring and decreased rapidly after mid-September , The photosynthetic rate of lingonberry was low in early spring but retained a relative-ly high level after mid-September. The light compensation point and light saturation point varied among 4 species. The ability of photosynthesis of highbush and half-highbush was higher than that of lowbush and lingonberry.