A Study on the Biomass of Alder and Cypress Artificial Mixed Forest in Sichuan Studies on Population Density and Biomass Dynamics of Scirpus Mariqueter STUDY ON THE BIOMASS OF ABOVEGROUND ORGANS AND LAYER STRUCTURE OF DEYEUXIA ANGUSTIFOLIA IN TYPICAL MEADOW ON SANJIANG PLAIN Dynamics of population biomass and its density-density dependent regulation in alder and cypress mixed forest Effects of Grazing on the Biodiversity and Productivity of Leymus secalinus Communities Biomass Dynamics of Mountain Region Perennial Ryegrass/White Clover Mixed Pasture in Subtropics Study on the seasonal growing dynamics and invasive characteris-tics of Gaura parviflora Density and Biomass Dynamics of Hippophae rhamnoides L.subsp.sinensis Population in Mu Us Sandland