鲁西黄河故道杨树林间作效益的研究

Study on the Benefit of Poplar Intercropping in the Old Course of the Yellow River in West Shandong

经过6年对鲁西黄河故道杨树人工林进行施肥量、间作物、密度等因素的正交试验,证明只有扩大造林 行距为10 m左右,造林后立即实行林下间作,并尽量延长间作年限,才能保证树体营养供应和林木正常生长, 提高林地的生产力和经济效益。同时,探索出在此类土地上不同林龄的杨树人工林的最佳间作方式。

After 6 years' orthogonal experiments on the factors such as quantity of applying fertilizer, intercropping plants,planting density etc,we find that only by enlarging the row spacing to 10 m,doing intercropping as soon as afforesting and prolonging the time of intercropping,the needs of forest' s nutrient and regular growing can be ensured, and the economic benefit of the forest will be raised. Meanwhile we find out the best intercropping ways of varying tree age' s poplar forest.