切根育苗对杉木苗木及幼林生长的效应

Effects of Taproot-cutting on the Growth of Nursery Seedlings and Young Plantations of Chinese fir

在福建顺昌进行切根育苗对杉木幼苗及幼林生长效应和经济效益的研究.结果表明,切根培育的苗木,尽管苗高、地径比常规不切根育苗略有降低,但主根长度、高径比减小,侧根数增加,Ⅰ级苗率提高30 2%,合格苗率提高33 3%,苗木质量有明显提高.杉木切根苗造林其成活率和幼林生长量略高于不切根苗,但差异不显著.杉木切根育苗能增加育苗收入和降低造林成本.

The effects of taproot-cutting on the growth of nursery seedlings and young plantations of Chinese fir,and the economic performance of taproot-cutting technique were investigated in Shunchang,Fujian,China.The results showed that although height and base diameter of seedlings growing by taproot-cutting technique were slightly lower than those of seedlings growing by the conventional non-cutting technique,the taproot-cutting seedlings had shorter taproot,lower height:diameter ratio, higher number of branch root,30.2% higher seedlings of class I and 33.3% higher certified seedlings,and thus promoted the quality of nursery seedlings markedly. Survival and growth rate of young plantations planted with taproot-cutting seedlings were higher than those with non-cutting seedlings,but the difference were not significant. Taproot-cutting technique could increase income of seedling growing and reduce the cost of afforestation of Chinese fir.