【摘要】 在土培条件下,设计3个水分水平和2个施氮水平,研究水肥耦合对水稻汕优63不同生育阶段根系形态与活力的影响。结果表明:在低土壤水分条件下增加氮素供应水平能够显著增加根干重、根体积和促进根系的扎深。根系干重的垂直分布可用对数模型、乘幂模型、指数函数模型、多项式函数模型来表示,相关系数均在0.9以上,且以指数函数的模拟精度最高。轻度降低土壤水分,增加施氮量能迅速提高根系活跃吸收面积和根系α-萘胺氧化活力,促进根系快速生长;过度降低土壤水分对水稻根系活力有抑制作用。更多还原

【Abstract】 Under the condition of soil culture,three moisture rates and two nitrogen application rates were designed to investigate the effects of water and nitrogen coupling on morphological characteristics and activity of root system in Shanyou 63.The results show that the dry weight,volume and depth of root system increase with higher nitrogen supplying level under less water supplying condition.The vertical distribution of root dry weight could be expressed by logarithmic function,power function,exponential(function) and polynomial function and each correlation coefficient was more than 0.9.However exponential function was the best.With higher nitrogen supplying level and less water supplying level,the root effective area and α-NA-oxidizing ability increased and the growth of root system accelerated.But root activities were bated with overmuch less water supplying level.更多还原