银中杨短轮伐期纸浆林定向培育技术研究

通过对银中杨进行苗龄型选择、造林密度、混交造林、营养元素测定和施肥等试验,对营造银中杨纸浆林的各环节的技术进行了定量和定性研究,确定了提高银中杨生长量和木材质量的技术措施。结果表明:银中杨纸浆林定向培育宜采用2根2干、3根2干壮苗,采用株行距2 m×4 m、3 m×4 m栽植,8~12 a轮伐。造林后的前3 a林粮间作。施肥的林龄是4~6 a,最佳施肥时间是7月上旬;最佳施肥配比为N∶P∶K=1∶0.84∶0.87。采用与胡枝子、沙棘混交造林,能促进银中杨的生长,减少病虫害的发生,生物量及光能利用率较纯林高15%左右。为半干旱地区营造纸浆林提供了配套技术措施。

Directional Cultivation Technology of Pulp Forest of Populus alba × Populus berolinensis with Short Rotation

Through the selection of seedling age,determination of forestation density,mixing of forestation,nutrition element and fertilization experiments,technical measures of increasing the growth of Populus alba × Populus berolinensis and wood quality were determined.We should use the sturdy seedlings of which stem age and root age are all two years and the trees of which stem age are two years and root age are three years to conduct pulp forest of Populus alba × Populus berolinensis by the measures of orientation cultivation.The row spacing with 2m×4m,3m×4m should be used.The rotation should be 8~12 years.Agroforestry should be used in preceding 3 years.The optimum stand age for fertilization was 4~6 years.The optimum fertilizing time was the first ten days of July.The optimal fertilizing rate was N∶P∶ K=1∶0.84∶0.87.Mixing with Lespedeza bicolor,Hippophae rhamnoides should accelerate the growth of Populus alba × Populus berolinensis and decrease the plant diseases and insect pests.The biomass and efficiency for solar energy utilization were 15% higher the pure forest.