Effects of fertilization and grazing on species richness in an alpine meadow of Qinghai-Xizang Plateau Light competition can cause a decline in diversity with increased productivity in an alpine meadow Effects of shading  on two Sphagnum species growth and their interactions.  COVER SHIFT AND MORPHOLOGICAL PLASTICITY OF INVASIVE ALTERNANTHERA PHILOXEROIDES ALONG A RIPARIAN ZONE IN SOUTH CHINA A literature review on the above- and below-ground competition Density Effects on Plant Height Growth and Inequality in Sunflower Populations