摘要： 通过液培试验研究了不同硫浓度(0.01～32 mmol/L)对烤烟根、茎、叶及全株钾吸收及积累量的影响,并通过Logistic方程对不同硫浓度下烤烟对钾素吸收、积累及分配规律进行了动态的曲线拟合。结果表明,在一定范围内(0.01～2 mmol/L)增加硫浓度有助于烤烟根、茎、叶及全株钾含量提高,促进烤烟对钾素的吸收与积累,进一步增加硫浓度(4～8 mmol/L)对烤烟根、茎、叶及全株钾含量影响不大,但其干物质积累的降低导致其钾的最大吸收速率和最大积累量明显降低。过高的硫浓度(16～32 mmol/L)使烤烟根、茎、叶及全株钾含量、最大积累量及最大吸收速率都显著低于其他4个处理,这是其干物质积累和含钾量降低共同导致的结果。在一定范围内提高硫浓度(0.01～4mmol/L)有利于烤烟钾向叶片的分配,但随硫浓度(8～32 mmol/L)的进一步提高,其分配比例又逐渐降低。硫浓度在2 mmol/L有利于烤烟对钾素的吸收与积累,过高的硫浓度会使烤烟对钾素的吸收速率和积累量降低。

关键词: 烤烟, 硫, 钾

Abstract: A solution experiment was carried out to study the effects of different sulfur concentration( 0.01-32 mmol/L) on potassium uptake and accumulation of flue-cured tobacco.Potassium uptake in plants parts as well as in whole plants followed a sigmoidal curve, accurately discribed by a logistic equation.The results indicated that the potassium contents were increased and the potassuium uptake and accumulation rate of flue-cured tobacco were improved with the increase of sulfur concentration from 0.01 mmol/L to 2 mmol/L.Further increase in sulfur concentration( 4-8 mmol/L) had no significant influence on the potassium contents of flue-cured tobacco plants parts and whole plant but resulted in a decrease of dry matter accumulation of flue-cured tobacco and that resulted in the maximum daily uptake rate and accumulation of potassium in flue-cured tobacco plants parts significant decrease.Potassium contents, maximum daily potassium uptake rate and maximum potassium accumulation of flue-cured tobacco plants parts and whole plant in higher sulfur concentration( 16-32 mmol/L) were significantly lower than other treatments.That were caused by the decrease of potassium contents ane dry matter accumulation of 16 and 32 mmol/L treatments.The increase of sulfur concentration from 0.01 mmol/L to 4 mmol/L promoted the distribution of potassium to leaves of fluecured tobcco but further increase in sulfur concentration resulted in the distribution ratio decrease.Optimal potassium of flue-cured tobacco uptake rate and accumulation were observed when sulfur concentration in the cultural solution was 2 mmol/L．

Key words: Flue-Cured tobacco, Sulfur, Potassium

中图分类号: 

• S143.7