A REVIEW: FACTORS INFLUENCING FINE ROOT LONGEVITY IN FOREST ECOSYSTEMS Fine root longevity and controlling factors in subtropical Altingia grlilipes and Castanopsis carlesii forests THE ROOT LONGEVITY OF ARTEMISIA HALODENDRON INHABITING TWO SANDY LAND HABITATS Factors influencing fine root longevity of plantation-grown Pinus sylvestris var. mongolica