摘要
施钾对叶片单位面积的叶绿素含量增加虽无显著效应,但在氮磷营养配合下,施钾能明显增强光合效能;提高净光合速率,降低暗呼吸速率、光呼吸/净光合比值及光补偿点和CO_2补偿点。 结果树雄钾能明显促进荔枝秋梢叶片中钾和碳水化合物积累,提高开花座果期间叶片的钾和淀粉水平,降低相对落果率.花后叶片中钾和淀粉含量显著减少.试验认为,荔枝花后树体钾素营养的不足和果实中钾浓度的下降可能与第一次生理落果有密切关系,而果实发育中后期的碳水化合物的不足则成为影响荔枝产量的主要因子.
Potassium treatment did not obviously increase chlorophyll content per unit leaf area, but increased the net photosynthetic rate, decreased the rate of respiration, the ratio of photorespiratory rate/net photosynthetic rate, light compensation point and CO2 compensation point. The results also showed that the stimulating photosynthetic function of potassium was affected by the applicate levels of nitrogen and phosphorus.Potassium treatment significantly increased potassium content and carbohydrate accumulation in leaves and decreased relative abscission rate of fruits. The contents of both potassium and starch in leaves rapidly declined after full bloom. It was suggested that the first wave of fruit-drop be closely related with lack of potassium of trees after full bloom and a decline of potassium concentration of fruits, while carbohydrate deficency be a main factor in the second wave.
出处
《华南农业大学学报》
CAS
CSCD
1993年第2期91-95,共5页
Journal of South China Agricultural University
关键词
荔枝
钾
碳水化合物
光合作用
座果
Litchi
Potassium
The net photosynthetic rate
Carbohydrate
