The effects of ecophysiological traits on carbon gain in invasive plants Community succession and photosynthetic physiological characteristics of pasture plants in a sub-alpine meadow in Gannan, China Comparisons on leaf traits of Quercus liaotungensis Koidz. on different slope positions in Dongling Moutain of Beijing A COMPREHENSIVE EVALUATION OF MIXED PLANTATIONS OF CHINESE FIR AND PINES BASED ON PRODUCTIVITY.RESOURCE—USE AND NUTRIENT CYCLING