Study on Stable Carbon Isotopic Composition of Populus nigra L.Gene Resource Comporison of Genetic Variations of Black Poplar (Populus nigra L.) Gene Resource by Microsatellite Markers Study on Gene Resources in Populus ussuriensis Prediction of Breeding Values and Selection to the Gene Resources of Loblolly Pine Advance on the Study of Biotechnology in Zoysiagrass GENETIC RESOURCES,TREE IMPROVEMENT AND GENE CONSERVATION OF HAPLOXYLON PINES IN EAST ASIA