水分胁迫对茅苍术根茎生长及挥发油含量的影响

通过控制茅苍术Atractylodes lancea（Thunb．）DC．]不同生长期的土壤含水量，研究了轻度和重度干旱胁迫与涝渍胁迫对茅苍术根茎生长及挥发油含量的影响。结果表明，在不同生长期，茅苍术根茎生长和挥发油成分含量对不同土壤水分条件的反应不同，其中生殖生长期对水分胁迫较敏感，干旱和涝渍胁迫均会导致根茎生长量和挥发油含量下降。水分胁迫对茅苍术根茎生长量和挥发油含量的影响效应是一致的，导致根茎生长量显著下降的水分条件可使挥发油含量下降，对根茎生长量影响不显著的水分条件则有利于挥发油成分的积累。在果后期进行适当的涝渍胁迫（土壤含水量35．5％～38．5％）有利于茅苍术根茎生长和挥发油含量的提高。

Effect of water stress on growth and essential oil content of Atractylodes lancea rhizome

The effects of stresses of light drought, strong drought and waterlogging on growth and essential oil content of Atractylodes lancea （Thunb.） DC. rhizome were studied by controlling water content in soil during different growth stages. The results show that the response of growth and essential oil content of A. lancea rhizome to different water stresses is varied. During reproductive growth stage, A. lancea is more sensitive to water stress, and both drought and waterlogging can lead to decrease of the growth increment and essential oil content of rhizome. The effect of soil water stress on rhizome growth increment is consistent with that on essential oil content. The soil water condition causing decrease of the rhizome increment also leads to decrease of essential oil content, while the soil water condition having no evident effect on the rhizome increment is benefit to the accumulation of essential oil in A. lancea rhizome. The proper waterlogging （soil water content 35.5% - 38.5% ） in the period from the end of reproductive growth stage to dormancy stage may be helpful to rhizome growth and can improve the essential oil content in A. lancea rhizome.