REVIEW OF STUDIES ON MAXIMUM SIZE-DENSITY RULES A Review on Stand Density──about the 3/2 Power Law Self-thinning of natural broadleaved forests in Baishilazi Nature Reserve Relationships Between Population Growth and Population Density in Monocultures of Larix leptolepis Allometric relationship between mean component biomass and density during the course of self-thinning for Fagopyrum esculentum populations