论文部分内容阅读
近年来,我国北方平原及长江中、下游地区杨树人工林栽培有了很大发展。过去,在这些地区栽植杨树主要用作民用建筑材,随着工业建设的发展,杨树工业利用的比重将逐步增加。为了适应这一转变,从现在起就应注意按工业用材标准来培养杨树人工林。 杨木在工业利用中价值最高的是胶合板材。要培育胶合板材,除选用速生优质良种,选择适宜立地条件,确定适宜栽植密度和采取细致整地、灌溉、施肥、虫害防治等一系列集约栽培措施外,还有一个十分重要的环节就是进行及时和正确的修枝抚育。杨树人工林修枝抚育应包括以下内容:
In recent years, cultivation of poplar plantations in the northern plains and in the middle and lower reaches of the Yangtze River in our country has greatly developed. In the past, planting poplar in these areas was mainly used as civil construction materials. With the development of industrial construction, the proportion of poplar industrial use will gradually increase. In order to adapt to this change, from now on, care should be taken to cultivate poplar plantations on the basis of industrial timber standards. Poplar in the industrial use of the highest value is plywood. To cultivate plywood, in addition to the selection of fast-growing high-quality seeds, select the appropriate site conditions, to determine the appropriate planting density and to take careful land preparation, irrigation, fertilization, pest control and a series of intensive cultivation measures, there is a very important part is timely and Correct pruning. Poplar plantations Pruning should include the following: