混交造林与人工林的持续速生丰产

本文概述我国速生丰产林的发展过程、取得的成就及存在的主要问题,如忽视适地适树原则、树种单一、管理粗放等,以致林分生长不良,甚至引起地力衰退及病虫害蔓延。指出林地持续利用和保持人工林长期生产力的重要性。简述混交林在速生丰产林中的作用和实例,指出营选混交林是维护地力、提高林木抗性的有效途径之一,并扼要介绍各种混交模式在速生丰产林中的应用。最后指出我国速生丰产林应注意的问题。

Problems on Continuous Fast Growing and High Yield Plantation and Applications of Mixed Forest in Fast Growing and High Yield Plantation

This paper, briefly reviewing the developing history and achievements of the fast-growing and high-yield plantation in our country, points out the existing problems in this respect, such as neglecting the principle of "using the right land for the right trees", single tree species and extensive management etc., which resulted in bad forest stand and even caused decline in soil fertility and productivity and spreading of tree disease and insect. The importance of continuously utilizing forest land and maintaining long-period produc tivity for plantation is especially stressed. And on the other hand, the paper riefly reviews mixed forest significance and gives examples of fast-growing and high-yield plantation and points out that planting mixed forest will be one of effective approaches to sustaining soil fertility and improving tree resistance. At the same time the application of long-period mixture, short-period mixture, stereo-mixture and patch mixture etc. in fast-growing and high-yield plantations are briefly introduced. The paper also points out the differences between our country's fast-growing and high-yield plantations and foreign ligniculture as well as the problems of developing fast-growing and high-yield plantations in our country, which are worth calling attention to.