A PRELIMINARY ANALYSIS FOR THE RELATIONSHIP BETWEEN THE HISTORY OF PANAX GINSENG POPULATION MOVING NORTHTOWARDS AND THE HUMAN POPULATION PRESSURE DURING THE PAST 2000 YEARS
人参种群2000年间向北消退的历史及其与人口压力关系的初步分析

Through an analysis of agreat deal of historical meterials and study on Panax ginseng Nees growing area, this paper gives a historical survey on the population distribution of Panax ginseng Nees moving from the banks of the Yellow river toward the North during the past 2000 years. It also analysis the principle of population Panax ginseng moving northtowards historically in a wide area, and establishes a model of ecological environment as the survival space of population of Panax ginseng Nees was destroyed by human being :Nt: survival numbers of population of Panax ginseng NeesK: the maximum carrying capacity of environmentpm: the maximum survival densityS: the maximum survival space of population of Panax ginseng NeesP: the human population pressureAccording to this model, the threshold of the population P anax ginseng Nees bearing human population pressure is 45 persons per square kilometer. The conclusion that the human population pressure forces the population of Panax ginseng Nees moving towards histrically is given in this article.