The Study on Ecological Field of Endangered Plant Alsophila spinulos Individual The improved model of plant ecological field and the case analyzing Some comments on ecological field Ecological field gradient of Anewolepidium chinense under different population densities and its dynamic characteristics Characteristic. analysis of two-dimensional behavior of aboveground ecological field of Aneurolepidium chinense Study on the Individual Ecological Field Gradient of the Endangered Plant Alsophila spinulos Application of ecological field theory to research of crops REGULARITY OF THE ECOLOGICAL POTENTIAL AND GRADIENT OF ABOVEGROUND ECOLOGICAL FIELD OF ANEUROLEPIDIUM CHINENSE AND THEIR SEASONAL CHANGES UNDER DIFFERENT POPULATION DENSITIES