杨树是临邑县主栽树种之一。为引进杨树优良新品种，对中林４６、中林２３、中林２８，进行了栽培对比试验，现将６年试验结果总结如下。１试验林地的自然概况试验林地设在沿沙河北岸林子、理合、宿安三乡镇三个村庄。土质为沙壤潮土，ｐＨ值７６，地下水位１８ｍ，土... Poplar is one of the main tree species in Linyi County. In order to introduce excellent new varieties of poplar, comparative experiments were carried out on Zhonglin 46, Zhonglin 23 and Zhonglin 28, and the results of six years of experiments are summarized as follows. A natural overview of the experimental forest land The experimental forest land is located in the three villages of the three townships of Linzi, Lihe and Su’an along the north bank of the Shahe River. Soil is sandy loam, pH 7  6, groundwater level 1  8m, soil ...