失水程度及基质重对油茶容器苗生长和生理特性的影响

对容器基质重与油茶苗生物量及基质失水程度与苗木过氧化氢酶、过氧化物酶、电导率等生理生化特性的关系进行了测定。结果表明:(1)容器基质重量与油茶地上部分的生物量呈正相关,其回归方程为:y=0.059x+0.919 4。(2)在不同失水程度下,基质与茎叶的重量比值变化趋势为负抛物线型。(3)叶片相对电导率随着失水程度的增加呈先降后升的趋势,且在失水20%左右时,相对电导率达到最低值,随后开始急剧上升。(4)2种酶活性随着失水程度的增加也呈先降后升、最后失活的趋势,且在失水40%时,活性达到最高峰,随后逐步下降。(5)所有试验表明在失水20%时苗木各项生理指标处于一个最佳状态。因此,今后在油茶容器苗培育过程中,一定要注意苗木水分的科学控制,使容器基质失水程度控制在20%以内。

Effect of dehydration degree and weight of substrate on the growth and physiological characteristics of Camellia oleifera container seedlings

In this paper,relationship between the weight of container substrate and the aboveground biomass of seedlings,and relationship between the container substrate dehydration degree of Camellia oleifera and the enzyme activities of peroxidase(POD),catalase(CAT),and the relative conductivity were studied.The results showed that:(1) The weight of container substrate was positively related with the aboveground biomass,and the regression equa-tion was y = 0.059 x + 0.9194.(2) There was a negative parabola correlation of the ratio of the weight of container substrates and the aboveground biomass in the different dehydration conditions.(3) The leaf relative conductivity firstly decreased then increased as dehydration degree increased with the relative conductivity reached its lowest value at 20% dehydration degree,followed by a sharp increasing trend.(4) CAT and POD activity firstly decreased then increased and finally inactivated as the dehydration degree increasing,and the enzyme activities reached its peak when the dehydration degree was 40%.(5) All the tests showed that physiological activity of seedlings was op-timum when the dehydration degree was 20%.Therefore,the dehydration degree of container substrate should be controlled in 20% in the process of cultivating container seedlings of C.oleifera in the future.