草类-小檗沙棘灌木林群丛不同树种更新效果评价

摘要

为研究草类-小檗沙棘灌木林群丛不同树种更新效果,选择草类-小檗沙棘灌木林群丛不同微环境,设更新幼苗树种(A因素)和更新幼苗与灌木之间的距离(B因素)两组水平搭配,A因素设计A1(山杨苗)和A2(青海云杉苗)2个水平;B因素设计B1(0.25 m2)、B2(1.0 2)、B3(4.0 m2)、B4(≥9.0 m2)等4个水平,调查更新成活率、生长量.试验结果表明:(1)山杨更新幼苗与灌木之间的距离对山杨更新幼苗生长的影响显著;在B3(更新幼苗在4.0 m2中央即2.0 m×2.0 m左右)山杨幼苗生长效果最好,成活率达到78.6%.(2)青海云杉更新幼苗与灌木之间距离对更新幼苗生长的影响显著.在B1(更新幼苗在0.25 m2左右中央即0.5 m×0.5 m)幼苗生长效果最好,成活率达到96.7%.(3)在草类-小檗沙棘群丛条件下,采用青海云杉更新比山杨效果好.%In order to study regeneration effect of Populus davidiana in grasses-shrub association of Berberis thunbergii & Hippophae rhamnoides, choosing different microenvironment of grasses-shrub association of Berberis thunbergii & Hippophae rhamnoides;two groups of level collocation, regeneration seedling trees (A factor) and regenerated seedlings and the distance between seedlings and shrubs (B factor) were set.A factor are two levels : A1 (Populus davidiana) and A2 (Picea crassifolia seedlings) respectively;B factors are four levels;the survival rate and growth of regeneration were investigated.Result shows that: (1) the distance between the regenerated Populus davidiana seedlings and the shrubs significantly affect growth of regenerated Populus davidiana seedlings.The growth effect for B3 (regeneration seedlings in the middle of the 4.0 m2 ,that is ,2.0 m× 2.0 m) is optimal in,the survival rate being 78.6%.(2) distance between regenerated Picea crassifolia seedlings and shrubs significantly affect growth of seedlings.effect of growth of B1 (regenerated seedlings in the middle of the 0.25 m2 ,that is, 0.5 m × 0.5 m) is optimal, the survival rate being 96.7%.