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新造杨树片林在前两年内林分尚未郁闭,林木之间空隙大,林内阳光充足。可在林内套种经济作物,以提高林地的经营管理水平,促进林木生长,增加经济收入。青铜峡市大坝乡于1984年3月下旬造林,成活率94％,在苗木来源和管理措施相同、土壤条件类似的情况下,合作杨、箭杆杨林地套种西瓜、辣椒、大葱、西红柿、黄豆和茄子等对树木生长不但没有不良影响,且比对照的生长速度加快,其高生长分别增加14.2～43.2％;地径生长分别增加29.2～
The new poplar forest in the first two years has not yet closed, the gaps between the trees, the forest sunshine. In the forest intercropping cash crops, in order to improve the management level of forest land, promote forest growth, increase economic income. Qinghaixia Dam Township in late March 1984 afforestation, survival rate of 94%, in the same source of seedlings and management practices under similar soil conditions, Yang cooperation Yang, Yangzhong planted interplanting watermelon, peppers, green onions, tomatoes, Soybeans and eggplant, etc. not only had no adverse effect on the growth of trees, but also increased the growth speed of the trees compared with the control. The height growth increased by 14.2 ~ 43.2%, and the growth of ground diameter increased by 29.2 ~