Earth Human Settlement Ecosystem and Underground Space Research

The goal of this study is the Earth human settlement ecosystem evolution principle and its relationship with the Underground space. Research scope including the World population, the Earth temperature, the evolution rule and evolution mechanism of the Earth human settlement ecosystem, the relationship of the Earth human settlement ecosystem and the Underground space. Research methods mainly include system science, order parameter theory, logic, system evolution theory, bifurcation theory, the factor analysis method, system factor correlation principle, the gray correlation analysis method. The results of this study are mainly: First, put forward the concept of the Earth human settlement ecosystem and the concept of Human settlement ecological change. Second, reveals the evolution rule and evolution mechanism of the Earth human settlement ecosystem. Thirdly, summarizes the “Disordered state” and “First interference bifurcation” scientific facts of the Human settlement ecological change, put forward the “Second interference bifurcation hypothesis”, explained “The mechanism of many times interference bifurcation”. Fourthly, clarified the relationship of the the Earth human settlement ecosystem and the Underground space. The conclusion of this study shows that the Human settlement ecological change of “Disordered state” and “First interference bifurcation” two phenomena, has caused serious damage of the Earth human settlement ecosystem. The Underground space is an effective method for slowing the Human settlement ecological change, the Earth human settlement ecosystem and the Underground space is the relationship between the parent system and subsystem, with quantitative System factor correlation degree.