氮、磷、钾营养胁迫对黄芪幼苗根系活力及根系导水率的影响

Effect of nitrogen,phosphorus and potassium stress on root vigor and hydraulic conductance of Astragalus membranaceus seedling

摘要: 以膜荚黄芪为试验材料，通过室内1/2Hoagland全营养液、1/2Hoagland缺N(-N)、缺P(-P)和缺K(-K)营养液控制营养水平，进行水培试验，比较在营养胁迫情况下黄芪幼苗根系活力、根系导水率和叶绿素含量的变化。结果表明：与全素营养(CK)相比，缺素条件下黄芪根系活力、根系导水率及叶绿素含量降低，根面积减少，根冠比差异显著。-N和-P处理对根系导水速率影响极显著。

Abstract: Changes in root vigor, hydraulic conductance,and leaf chlorophyll content under nutritional stress were measured and compared in different hydroponic trial treatments of half-Hoagland nutrition (CK) and half-Hoagland nutrition without nitrogen (-N),phosphorus (-P) and potassium (-K) of referenced Astragalus membranaceus seedlings.When compared with full nutrient (CK) treatment,root vigor,root absorption surface area,root hydraulic conductance and leaf chlorophyll content significantly decrease in treatments without N,P and K elements along with significant difference in root/shoot ratio (R/T) between both the control and element-deficit treatments.Specially,both-N and -P treatments most significantly affect root hydraulic conductance.