KNO_3、K_2SO_4及其混盐胁迫对辣椒幼苗叶片N、P、K含量的影响

Effects of KNO_3,K_2SO_4 and Their Mixed Salt Stress on N,P,K Content in Leaf of Pepper Seedling

为探讨日光温室土壤主要盐分对作物营养元素吸收的影响,以辣椒品种亮剑为研究试材,比较研究了0,50,100,150,200 mmol/L的KNO3、K2SO4及其混盐(1∶1)对辣椒幼苗叶片内大量营养元素氮、磷、钾以及亚硝酸盐含量变化的影响,并进行了营养元素与光合指标和光合代谢产物相关性分析研究。结果表明,KNO3、K2SO4及其混盐胁迫对辣椒幼苗叶片N素含量影响存在一定差异,SO42-对NO3-的吸收有拮抗作用;盐胁迫抑制辣椒幼苗对P的吸收;随着胁迫浓度的逐渐增加,K含量大幅度增加;KNO3和混盐胁迫,辣椒幼苗叶片内亚硝酸盐含量没有增加;低浓度KNO3及其混盐胁迫,辣椒幼苗叶片内全N含量与亚硝酸盐含量呈极显著正相关,相关系数为0.830**,与Pn显著正相关,与全K含量显著负相关;高浓度KNO3及其混盐胁迫,辣椒幼苗叶片内总N含量与Chl含量、可溶性糖含量呈显著负相关关系。

The Effects of KNO3,K2SO4 and their mixed salt stress（0,50,100,150,200 mmol/L） on NPK and nitrite content in leaves of pepper Liangjian seedling were investigated.The results showed that KNO3,K2SO4 and mixed salt stress,there is a certain difference in impact on pepper seedling leaves of N content,SO42-prevented N absorption;Salt stress prevented P contents increasing in pepper seedling leaves;K contents showed a increasing trend with the increase of stress concentration;Nitrite content in pepper seedling leaves did not increased under KNO3 and mix salt stress;Low concentration of KNO3 and mixed with salt stress,pepper seedling leaves N content and nitrite content showed a highly significant positive correlation,the correlation coefficient of 0.830 ＊ ＊,a significant positive correlation with Pn,a significant negative correlation with the total K content;High concentrations of KNO3 and mix salt stress,the total N content in leaves of pepper seedlings,Chl content,soluble sugar content was significantly negative correlation.