我国“三北”防护林地区土地资源研究任务、内容和布局的探讨

本文在分析“三北”防护林地区环境特点与主要问题基础上,提出了为“三北”防护林体系建设服务的土地资源评价体系和布局意见。

A STUDY ON THE TASK,CONTENT AND DISTRIBUTION OF THE RESEARCH ON THE LAND RESOURCES IN "SAN BEI" SHELTER-BELT AREA OF CHINA

The west part of the Northeast and the most parts in North and north-west of China(where are called San Bei area),where the climate is dry andeco enviroment is weak, have been ljsted by the state as a long-term constru-ction progect of environment-the construction project of San Bei shel ter-belt system. Based on the characteristics of the natural encironment and some problemsin San Bei area, the paper suggests that the rising of the vegetation coverrate and establishing stable but complex structure cf biological community should be put in the first placs in the construction of the environmentin the area. As for the land resource, the paper suggests that special attentionshould be paid to the reasonable distribution of the shelter-belt and landused in agriculture, forestry and animal husbandry. The paper classifies the land in San Bei area which is suitable fordeveloping agriculture, forestry and animal husbandry: land for agricultureforestry and animal husbandry; land for animal husbandry and forestry; landfor animal husbandry and land unsuitable for agriculture, forestry and animalhusbandry. Besides nine levels of land are classified according to the land qualityIn the paper the types of the shelter-belt are also classified: the shelter- belt for.protecting farm land; wind-protection forest; sand-stability forest, water-conservation forest and etc. On the problems of the rational distribution of the shelter-belt, the paper puts forwards three suggestions which are listed as follows:———advocating regional distribution and macro-control.———developing forestry, bushes, grass and agriculture in the light of local conditions;———establishing the ecological structure of biological community.