【摘要】 通过对章古台沙地樟子松、赤松、油松人工林天然更新规律、密度、生长指标的测定及覆盖对其1年生幼苗越冬保存率影响的研究,结果表明:3种松树人工林更新方式主要为林隙更新和林缘更新,赤松有林下更新。降水量的大小显著影响天然更新密度和越冬保存率,降水量大的年份天然更新密度大、越冬保存率高。试验地内1年生幼苗天然更新的密度大小为赤松>樟子松>油松;自然越冬保存率大小为油松>赤松>樟子松。围封区内自然越冬存活下来的2年生以上幼树天然更新的密度大小为赤松>油松>樟子松。7年生林缘天然更新3树种生长指标大小分别为树高———赤松>油松>樟子松,地径———油松>樟子松>赤松,侧枝数和枝条总生长量———油松>赤松>樟子松。1年生幼苗经覆盖后越冬保存率远高于未覆盖的,因此应采取覆盖等人工促进措施,保证樟子松、赤松、油松1年生幼苗安全越冬。更多还原

【Abstract】 The effects of the natural regeneration,density,growth indicators and coverage of Pinus sylvestris var. mongolica,Pinus densiflora &Pinus tabulaeformis on the overwintering preservation rate of one-year-old saplings in Zhanggutai Sandyland were studied.Result shows that:the main regeneration modes of three species of pine trees are gap regeneration &forest edge regeneration;P.densifloraalso have undergrowth regeneration.The amount of precipitation significantly affected the natural regeneration density and overwintering preservation rate;the natural regeneration density is bigger and the overwintering preservation rate is higher in the very year with more precipitation;the descending order of the natural regeneration density of one-year-old saplings in experimental land is:P.densiflora > P.sylvestris var.mongolica > P.tabulaeformis;the descending order of the preservation rate of natural overwintering is:P.tabulaeformis > P.densiflora > P.sylvestris var.mongolica;in enclosed area,the descending order of the natural regeneration density of the over two-year-old saplings that survived the winter is:P. densiflora> P.tabulaeformis> P.sylvestris var.mongolica.The comparison on growth indicators of three species of seven-year-old conifers with natural edge regeneration is:the descending order of tree height is:P.densiflora > P.tabulaeformis> P.sylvestris var.mongolica;the descending order of the ground diameter is:P.tabulaeformis> P.sylvestris var.mongolica> P.densiflora;the descending order of amount of lateral branches and total growth amount of branches is:P.tabulaeformis>P.densiflora>P.sylvestris var.mongolica.The overwintering preservation rate of covered one-year-old saplings are significantly higher than that of the uncovered seedlings,therefore covering or other artificial promote measures should be taken to ensure that the three conifer species can safely overwinter.更多还原