辽宁东部山地混牧林可控阈值研究

辽东山区的林业和牧业一直是既互相依存又互相矛盾的两个行业，混牧林业的提出为解决这一问题提供了科学的依据。通过4年时间的定位观测及调查研究。对辽宁省混牧林业的现状，存在问题以及发展趋势等进行了系统研究，针对该区域森林生态环境的基本特征。制定出科学、简明、具有可操作性的林牧结合阈值：(1)幼林林分伤害指数临界阈值不能高于50；(2)截取利用牧草生物量(地上部分)50％为最佳值；(3)选择混牧林的坡度应小于30度。A层土容重不应大于1．3g。

Controllable Thresholds of Grazing Forests in the Mountainous Region in Eastern Liaoning

Forestry and animal husbandry have long been both positive and negative relationships in the mountainous regions in eastern Liaoning.Grazing forest,however,is a method to solve the problem.Experiments and investigations were carried out for4years to study the problems and development in grazing forest in Liaoning.Scientific and practical thresholds of grazing and forest integration were obtained according to the major characteristics of forest ecology in the region.The critical threshold of damage to young trees should not be higher than50;the best rate of grass harvest by cutting was50%;grazing forests should be located on the slopes less than30degrees,with soil volume weight of Layer A no more than1.3.