Spatial Distribution and Seasonal Changes of Needle-leaf Area Density within 17-year-old Chinese Fir Crown ANALYSIS ON TAXONOMIC CHARACTERS OF LARIX IN NORTHEAST OF CHINA Ⅱ——GEOGRAPHIC VARIATION OF SEED SCALES AND NEEDLE LEAVES Spectral characteristics of Pinus tabulaeformis  canopy with different damaged rates of needle leaf in western Liaoning Province, Northeast China.