Preliminary Study on Introduction and Cultivation of Knoxia valeriaides in Mid-altitude Area
Objective The origin ofKnoxia valeriaides was lower altitudes tropical and subtropical regions.K.valeriaides was introduced to 1 840 m mid-altitude area,the biological characteristics and adaptability of K.valeriaides was primary studied.Methods The K.valeriaides was used to the roots without rhizomes for breeding and observed adventitious shoot formation characteristic.K.valeriaides was introduced on November and the next summer on July separately and observed survival rate.And it was planted in different substrates in including clay,red soil,50％ red soil and 50％ coarse sandy,30％ red soil and 70％ coarse sandy,and observed survival rate in different substrate.We adopted without covering,covering with thickness of 5 ～ 8 cm pine-needles,covering with thickness of 5 ～ 8 cm pine-needles and adding mulch to protect them overwintering and observed survival rate.After introduction and cultivation one year,we dug up the underground parts of K.valeriaides and observed adventitious shoot formation characteristic and its expanding quantity.Results K.valeriaides roots without rhizomes could not be taken as material for breeding.Introducing in the growing season,seedlings survival rate was obviously higher.The red soil with a little sandy was best for the K.valeriaides growth.K.valeriaides could survive in topsoil temperature was not less than 2 ℃.Adventitious root with microtuber was the basis for increasing its production.Conclusion In the winter,K.valeriaides could be introduced and cultivated in midaltitude area if taken the adequate measures for preventing it.
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万方数据
维普
