漏斗状覆膜对不同密度新疆杨生长及光合特性的影响

Effects of Funnel-shaped Film Mulching on the Growth and Photosynthetic Characteristics of Populus bolleana with Different Densities

以晋北半干旱风沙区为研究区域,采用漏斗状覆膜技术造林,探讨覆膜对不同密度(株行距分别为2m×2m、3m×3m、4m×4m、4m×6m)新疆杨生长和光合特性的影响。结果表明,漏斗状覆膜技术对不同密度新疆杨生长和光合特性有显著影响(P<0.05),2m×2m密度的新疆杨生长性状和光合特性表现最优,不同密度的树高、胸径、当年生长量、成活率、叶绿素含量、净光合速率表现出随密度减小而递减的规律,相关分析显示树高、胸径与净光合速率的相关系数分别为0.991、0.863,与叶绿素含量的相关系数分别为0.858、0.584。综合分析结果,在晋北半干旱风沙区,覆膜面积所占比例显著影响树木的成活与生长,新疆杨初植密度为2m×2m且漏斗状覆膜效果最佳。

Taking the semi-arid sandy region of northern Shanxi Province as research area,the effects of funnel-shaped film mulching on the growth and photosynthesis of Populus bolleana seedlings with different planting densities （2×2,3×3,4×4,and 4 m×6 m） were examined.Significant influences （ P 〈0.05） were observed.The growth indexes and photosynthetic characteristics were the best in the density of 2 m×2 m.The tree height （H）,diameters at breast height （DBH）,annual growth,survival rate,chlorophyll content （ChlC） and net photosynthetic rate （ P n） decreased with the decrease of planting density.Correlation analysis showed that the correlation coefficients were 0.991 （between H and P n） ,0.863 （DBH and P n）,0.858 （H and ChlC） ,0.584 （DBH and ChlC）,respectively.Over all,the proportion of film mulching significantly affected the survival and growth of P.bolleana ,and the initial density of 2 m×2 m with funnel-shaped film mulching was suggested in semi-arid sandy area of Northern Shanxi Province.