丽江市退耕还林海棠果造林模式研究

Planting Pattern of Malus yunnanensis Applied to "Grain for Green" National Forestry Program in Lijiang Municipality

对丽江市退耕还林工程建设中不同海棠果造林模式进行对比分析，结果显示：海棠果＋紫花苜蓿，初植密度为840彬hm^2或1110彬hm^2的间作模式株数保存率、生长量、挂果量均明显优于相同初植密度的海棠果纯林造林模式．该模式可有效提高高寒冷凉山区的退耕还林成效，适合在丽江市及周边地区海拔2300～3000m的区域内推广．

Different planting patterns for Malus yunnanensis applied to ＂Grain for Green＂ national forestry program conducted in Lijiang Municipality were studied. The results indicated that intercropping pattern of M. yunnanensis with Medicago sativa was better than the pure plantation of M. yunnanensis in term of growth and fruiting effect. The density experiments showed that 840 plant/hm^2 or 1 110 plant/hm^2 of M. yunnanensis trees intercropped with Medicago sativa resulted in higher survival rate, tree growth rate and fruit yield compared to the pure apple plantations with the same densities. The intercropping pattern could effectively promote the reforestation effect in the cool mountainous area and it was recommended be extended around Lijiang City and in the peripheral areas with elevation from 2 300 m to 3 000 m.