To explore the effects of silicon and manganese on Castanopsis hystrix seedlings,the growth and physiological characteristics of seedlings treated with different concentrations of silicon and manganese were measured.The results showed that:the relative increase in plant height and ground diameter,the root morphological index,and the SOD,POD,CAT,and APX activities of red cone-shaped plants increased first but then decreased with increasing concentration in the Mn or Si treatment and the presence of MDA contrast agent.Low concentrations of Mn(200,600 μg·g-1)or Si(500,1 000 μg·g-1)were beneficial to the growth and development of red cone-shaped plants,but high concentrations of Mn(1 500,3 000 μg/g)or Si(2 000 μg·g-1)were inhibitory.An appropriate amount of Si(500 or 1 000 μg·g-1)can alleviate the stress caused by a high concentration of Mn and improve physiological indices of inhibited growth.However,excessive Si(2 000 μg·g-1)aggravated the stress.The simultaneous addition of an appropriate amount of Si and Mn significantly promoted the growth and develop-ment of Castanopsis hystrix seedlings,of which 600 μg·g-1 Mn and 500 μg·g-1 Si were the best treatments.The addition of high concentrations of silicon and manganese resulted in severe inhibition.Castanopsis hystrix has a certain Mn tolerance(the Mn addition range is less than 1 500 μg·g-1).Mn ore in some areas of Guangxi has the potential for Castanopsis hystrix pro-duction cultivation and ecological forest application.
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