STUDIES ON THE REPRODUCTION AND PHOTOSYNTHETIC ECOPHYSIOLOGY OF THE EXOTIC INVASIVE PLANT, PLANTAGO VIRGINICA Relationship Between Growth Redundancy and Size Inequality in Spring Wheat Populations Mulched with Clear Plastic Film Effects of Plant Sizes on the Nitrogen Use Strategy in an Annual Herb, Helianthus annuus (Sunflower) Effects of fertilization and grazing on species richness in an alpine meadow of Qinghai-Xizang Plateau Density Effects on Plant Height Growth and Inequality in Sunflower Populations The coupling development of economy and environment under the background of World Expo in Shanghai Size-symmetric competition in a shade-tolerant invasive plant THE DYNAMICS OF SIZE INEQUALITY IN SPRING WHEAT POPULATIONS UNDER SEMIARID CONDITIONS AND ITS PHYSIOECOLOGICAL BASIS Instant response of individual size inequality indices to thinning regimes in plantation. Effect of potassium fertilizer and plastic film mulching on growth and size inequality in Lilium davidii var. unicolor