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干热河谷区气候燥热,土壤瘠薄,造林难度较大,我省经多年造林试验,筛选出适宜这种自然条件的造林树种达数十种,现择其要者作简要介绍: 山地适宜树种: 1.马尾松、云南松、思茅松:此为松科松属的三个造林先锋树种。思茅松早期生长较快,但耐干瘠程度远不如云南松及马尾松。这三种树一般适宜种植于干热河谷区的上沿,即年降水量在700毫米至900毫米,蒸发量为降水量的2至4倍,干燥度1.3—1.6的地区;在更为燥热的干热河谷区中段则不易成林。 2.栓皮树、麻栎:是干热河谷地区松类的重要混交树种。主
Hot and dry valley dry climate, infertile soil, afforestation more difficult, after years of afforestation experiments in our province, screened suitable for such natural conditions of dozens of species of afforestation, now choose the main person for brief introduction: suitable for mountain species: 1. Masson pine, Pinus yunnanensis, Simao pine: This is the Pinus sylvestris three pioneering tree species. The early growth of Simao pine is rapid, but the degree of drought-resistant is far less than that of Pinus yunnanensis and Pinus massoniana. These three trees are generally suitable for planting on the upper reaches of the dry-hot valley, ie, areas with an annual precipitation of 700 to 900 mm and an evaporation of 2 to 4 times the precipitation and a dryness of 1.3 to 1.6; Dry and hot valley in the middle is not easy to forest. 2. Cork bark, Quercus acutissima: is an important mixed species of pine in the dry-hot valley. the Lord