Ecophysiological Characteristics and Their Competition Mechanism of the Two Dominant Grasses in Horqin Sandy Land: Artemisia halodendron and Artemisia frigida Ecophysiological characteristics of kindred dominant shrubs in different areas of ecologically vulnerable zone Comparing ecophysiological characteristics of Castanopsis fargesii seedlings and saplings under different disturbance regimes:A case study of the Tiantong evergreen broad-leaved forest,Zhejiang Province of China STUDY ON ECOPHYSIOLOGICAL CHARACTERISTICS OF CAMELLIA SINENSIS GROWN IN INTERCROPPING TEA PLANTATIONS Influence of light intensity on the growth and ecophysiological characteristics of Hymenocallis littoralis