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杨树造林能否速生丰产,与苗木的规格有密切的关系。我们在1983—1988年进行了这方面的研究,取得明显的效果。现将试验情况总结如下。 一、试验地概况 试验地设在沂水县武家洼乡小庄子村。土壤为沂河冲积形成的沙壤土,活土层深60厘米。PH值(?).0。年平均气温11.6—12.6℃,绝对最高温度39.1℃,最低温度-12.2℃。年平均降水量750—850毫米,雨量多集中在7月和8
Poplar afforestation can fast-growing, and seedling specifications are closely related. We conducted this research in 1983-1988 and achieved remarkable results. Now the test situation is summarized as follows. First, the pilot to test the general situation is located in Yushui County Wujiawa Township small village. The soil is the sandy loam formed by the alluvial Yi River, and the living soil layer is 60 cm deep. PH value (?). 0. The annual average temperature of 11.6-12.6 ℃, the absolute maximum temperature of 39.1 ℃, the lowest temperature -12.2 ℃. The average annual rainfall of 750-850 mm, rainfall mostly concentrated in July and 8