黄土高原林农复合生态系统建造模式及效益的研究

当今林农复合生态系统的研究已受到许多国家的重视。本文提出发展能源林，解决黄土高原农村能源问题，可实行林农牧相结合的技术方针，即建立以沙棘、山桃、柠条、刺槐等能源林树种为主居于上层空间，在下层以带状或行间配置粮、油作物或牧草等，组成林农复合生态系统的建造模式，以提高能源林的生物产量、经济效益以及土地利用率。

A STUDY ON THE CONSTRUCTION MODEL OF THE COMPLEX ECOSYSTEM OF AGROFORESTRY AND ITS BENEFITS ON THE LOESS PLATEAU

Nowadays the research on the complex ecosystem of agroforestry has been valued by many countries. It organically integrates tree, shrub with grass, crop, fruit tree, drug plant, etc. to construct a complex ecosystem of agroforestry with high productivity and great comprehensive benefit. It was put forward in this paper that the technical policy of the combination of forestry with agriculture, livestock farming may be practised in developing energy forest to solve the rural energy problem. That is to say, the energy-forest species including Common Seabuckthorn, David Peach, Korshinsk Pearhrehrub, Black Locust, etc. are taken as the dominant part and occupy the upper layer of a space, in which the species including grain, edible-oil vegetable, forage grass, etc. at the lower layer are disposed in belt or between tree lines to form a optimum con-struction model of the complex ecosystem of agroforestry so as to raise energy-forest bioyield, economical benefit and land utilization ratio.