盐胁迫下氮磷钾肥对虉草离子吸收与分布的影响

以通草1号虉草(Phalaris arundinacea ‘Tongcao No.1’)为试验材料,采用盐胁迫(300 mmol·L^-1 NaCl)与不同氮磷钾肥配施处理的沙土盆栽试验方法,分析盐胁迫下氮磷钾肥对虉草K⁺, Na⁺, Mg²⁺, Ca²⁺ 和Cl^-吸收与分布的影响,并探讨氮磷钾肥水平与离子含量间的相关性.结果表明:随着氮、磷、钾肥水平增加,虉草体内 K⁺, Mg²⁺和Ca²⁺含量升高,而Na⁺和Cl^-含量下降,同时K⁺/Na⁺, Mg²⁺/Na⁺和Ca²⁺/Na⁺比值升高.氮磷钾肥施量与虉草Na⁺含量间成显著负相关,与K⁺和Mg²⁺含量间成显著正相关(P<0.05).在3种肥料中,氮肥对虉草K⁺, Na⁺, Mg²⁺, Ca²⁺ 和Cl^-含量的影响最明显,钾肥对Mg²⁺和Cl^-含量影响较明显,而磷肥对Ca²⁺和Mg²⁺含量影响较明显.

Effects of Different NPK Fertilizer Rates on the Ion Absorption and Distribution of Reed Canarygrass(Phalaris arundinacea) Under Salt Stress

The ion absorption and distribution of reed canarygrass under salt stress(300 mmol·L^-1 NaCl) were studied using pot sand culture experiment under a rain shelter for understanding the changes of K⁺, Na⁺, Mg²⁺, Ca²⁺ and Cl^- contents and the correlations between ion contents and different NPK levels. The results showed that the contents of K⁺, Mg²⁺ and Ca²⁺ increased and the contents of Na⁺ and Cl^- decreased in reed canarygrass seedling under salinity stress. The ratios of K⁺/Na⁺, Mg²⁺/Na⁺ and Ca²⁺/Na⁺ increased with the increase of NPK fertilizer level. The Na⁺ content of reed canarygrass was a significant negative correlation with NPK level, whereas the K⁺ and Mg²⁺ content of reed canarygrass was a significant positive correlation with NPK level (P<0.05). Nitrogen fertilizer had the most significant effect on the K⁺, Na⁺, Mg²⁺, Ca²⁺ and Cl^- contents of reed canarygrass compared with others. Potassium fertilizer had more effect on the Cl^- and Mg²⁺contents of reed canarygrass,whereas phosphate fertilizer had more effect on the Ca²⁺ and Mg²⁺contents of reed canarygrass than others.