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氮素供给对甘草根系呼吸动态及生物量积累的影响研究

Keywords: 甘草,系呼吸,氮素,生物量,相关性

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Abstract:

探究不同氮素供给对甘草根系呼吸及生物量积累的影响规律,揭示通过影响根系呼吸来调控甘草生物量积累的途径。在6月至10月,每7d对控制环境条件下的甘草播种苗施用氮(N)浓度为0,0.5,1,2,4,8mmol·L-1的全营养液,每月月底测定甘草不同级别根系呼吸速率及生物量,分析甘草根系生物量与呼吸速率的相关性。研究结果表明,氮素显著影响甘草根系呼吸速率和根系生物量积累,通过相对抑制生长呼吸速率以提高生物量而使两者呈负相关,并在8mmol·L-1氮浓度处理时有最佳的抑制甘草根呼吸而提高根系生物量的效果。

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