盐碱胁迫对燕麦水势、干物质积累率以及K+、Na+选择性吸收的影响

研究了自然盐碱胁迫对燕麦植株水势、干物质积累率以及对K 、Na 选择性吸收的影响,结果表明,随着土壤盐浓度的升高燕麦叶片和根系的水势较对照均有所降低,其中裸燕麦较皮燕麦水势下降幅度大。干物质积累率的变化规律表现为:在盐碱胁迫下燕麦各生育时期的干物质积累率随着盐碱浓度的增大而增大,各盐碱处理的干物质积累率大于对照(个别处理除外)。随着盐碱浓度的升高植株对Na 的吸收增加,K 的吸收受抑制,从而使Na /K 和S Na K 值升高,在同一处理内叶片的Na /K 最高,穗中Na /K 最低。图1,表4,参14。

The effects of Saline-alkali stress on water potential, percentage of dry matter and selective absorption to K+ and Na+ in oats

The experiment were studied the effect of Saline-alkali stress on water potential,percentage of dry matter and selective absorption to K~ and Na~ in oats under four different soil salt concentration.The result showed that the water potential of leaf and root decreased with increasing salinity in both breeds, and the decline of water potential of Avena nuda L.was greater than that of Avena Sativa L,which indicated that Avena nuda L.was sensitive to salt than Avena Sativa L.The percentage of dry matter increased with increasing salinity at each period,and the value was greater than antitheses'(besides certain disposals).The absorption of Na~ has increased and the absorption of K~ has decreased with increasing salinity,so Na~ /K~ and S Na~ K~ had increased.The value of Na~ /K~ to leaf was high and it was lower to spike within certain disposal.