搞好林地套种是发展立体林业的一方面内容。过去,由于人工造林管理粗放,幼林生长缓慢,通过林地套种往往容易收到“以耕代抚、以短养长”的效果。现在,人工造林已趋向集约经营,特别是丰产林的单位面积的投资、投劳都比过去成倍增加,相当一部分林地还用深翻、施肥等高质量的管理 Doing a good job in the interplanting of forestland is one aspect of the development of solid forestry. In the past, due to the extensive management of afforestation and the slow growth of young forests, it is often easy to receive the effect of “cultivating and rearing land to support agriculture and short growth” through interforestation. At present, afforestation has tended to be intensively managed. In particular, the investment and investment in unit area of ​​high-yield forests have multiplied more than in the past. A considerable part of the forest land is also managed with high quality such as deep plowing and fertilization