【摘要】 通过对晋南盆地混农杨树人工林立木密度与小麦产量关系的深入研究．提出了在间种地小麦产量不低于 ３ ７５０ ｋｇ／ｈｍ２或减产幅度不大于 ２８． ０％的前提下．培育杨木中径材的最佳初植立木林行距为 ６ ｍ × ６ ｍ、第４年底进行一次间伐．可得到部分小规格中径材．６年生时立木胸径可达到中径材规格上限值．即可轮伐。更多还原

【Abstract】 After studying the interaction between poplar tree’s planting density and wheat yield output within an agro-forestry system in the basin area of south Shanxi province. the authors propose the following criteria and management methods: under the prerequisite of wheat yield more than 3 750 kg/hm2 or the yield reduction percentage less than 28%. the appropriate poplar trees’ density are 6 m× 6 m; four years after planting. cut down the alternative rows to obtain small standard of medium size timber; rotational harvesting can be carried on in the sixth year for medium size timber更多还原