关键词: 玉米, 玉米, 新品种, 陕单972, 品种选育

Abstract: The physical and chemical characters of the soils from uphill and downhill of three ecological forests in Dongguan city were Analyzed and the growth rates of the trees from uphill and downhill were measured respectively. The results showed that the physical and chemical characters of the soil of downhill was better than uphill and the growth rates of trees also had a tendency that trees from downhill grown faster than ones from uphill. The extent of influence by the diversity of soil from uphill and downhill was different on different tree species. The results contributed to the vertical placement of afforesting trees and the applying of the afforesting practice.