A Study on the Model for Estimation Winter Wheat Yield Using Spectral Data of Wheat Field Spatial Distribution and Seasonal Changes of Needle-leaf Area Density within 17-year-old Chinese Fir Crown Studies on Relationship among Character of Canopy Light Interception and Yield in Maize Populations(Zea mays L.) CANOPY GEOMETRICAL STRUCTURE,INTERCEPTION OF PHOTOSYNTHETICALLY ACTIVE RADIATION AND THEIR EFFECTS ON POTENTIAL PRODUCTIVITY OF WINTER WHEAT IN TIBET PLATEAU Ecophysiological characteristics and productivity of wheat-cotton community Colony structural characteristics of crops on high-yield fields in Huanghuaihai plain Biomass and Leaf Area Dynamics of Modular Populations in Gordonia acuminata Analysis of photosynthetic capacity of four apple canopy structures in China Tree structure and 3-D distribution of radiation in canopy of apple trees with different canopy structures in China Digital modeling of light distribution within the crop canopy in jujube-wheat interplanting system Canopy Development,Light Interception and Grain Yield in High Yielding Wheat Varieties in Beijing District