【摘要】 为探究水肥耦合调控条件下叶绿素、光合速率和干物质积累等的动态变化规律,采用适宜水量、干旱胁迫2个处理作为主因子,施肥处理作为副因子（纯氮60、90、120 kg/hm²,P₂O₅30、60、90 kg/hm²）,于苗期测定叶绿素含量、光合速率和干物质积累量。研究表明,在干旱条件下,不同施肥处理的叶绿素含量有显著差异,其中N1P2（纯氮60 kg/hm²,P₂O₅60 kg/hm²）含量最高为0.97 mg/g;水分适量时,不同施肥处理结果差异显著,其中N1P2含量也最高为1.189 mg/g。在干旱条件和水分适宜2个条件下,各施肥组合处理后的光合速率有显著差异,其中N1P2值均达到最大,分别为16.06、17.969μmol/（m²·s）。另外,在干旱和水分适量2个条件下,各施肥处理之间干物质积累有显著差异,其中N1P2干物质积累量在2个处理条件下均是最大值,分别为0.183、0.256 g/株。因此,干旱胁迫下胡麻的光合作用弱于适宜水量处理下的光合作用,适宜的氮磷配施可以显著提高光合速率,增加干物质量的积累。更多还原

【Abstract】 In this study, the dynamic changes of chlorophyll, photosynthetic rate and dry matter accumulation of flax were investigated. Suitable water amount and drought stress were used as the main factors, and fertilization was used as the secondary factor（pure nitrogen: 60, 90, 120 kg/hm²; P₂O₅: 30, 60, 90 kg/hm²） to measure the chlorophyll content, photosynthetic rate and dry matter accumulation at seedling stage. The results showed that there were significant differences in chlorophyll content under different fertilization treatments.Under drought condition, the chlorophyll content of N1P2 treatment（pure nitrogen 60 kg/hm², P₂O₅60 kg/hm²）was the maximum of 0.97 mg/g, under appropriate water treatment, the highest chlorophyll content was observed in N1P2 as 1.189 mg/g. There were significant differences in the photosynthetic rate of each fertilization combination, under the drought stress and appropriate water treatment, the photosynthetic rate of N1P2 reached the maximum value of 16.06 and 17.969 mol/（m²· s）, respectively. In addition, there were significant differences in dry matter accumulation among different fertilization treatments under drought stress and appropriate water treatment, the dry matter accumulation of N1P2 was the largest, 0.183 and 0.256 g/plant,respectively. Under drought stress, the photosynthesis of flax could be weaker than that under water treatment,and the appropriate nitrogen and phosphorus application could significantly improve the photosynthetic rate and increase the accumulation of dry matter.更多还原