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9-ha mixed broadleaved-Koreanpine forest plot and 9.12-ha Spruce-fir valley forest plotat Liangshui in Xiaoxing’an Mountains in HeilongjiangPrincipal Investigator / Guangze Jin, Professor of Northeast Forestry University. His research isfocused on Forest Ecology, Biodiversity and Conservation.Research Team / Yanyan Liu, Tiefeng Piao, Zhili LiuPlot IntroductionThe Liangshui 9-ha mixed broadleaved-Korean pine forest dynamics plot(47.18°N,128.88°E) and 9.12-ha spruce-fir valley forest dynamics plot (47.20°N,128.85°E)are located in the Liangshui National Reserve of Yichun City, Heilongjiang Province,northeastern China. The mean annual temperature is -0.3 ℃ and mean annualprecipitation 676 mm.The 9-ha plot was established in 2005. The average elevation of the plot is 463 mwith maximum altitude difference of 84 m. In this plot, Pinus koraiensis is constructivespecies, and major associated tree species include Tilia amurensis , T. mandshurica ,Betula costata , Fraxinus mandshurica , Acer mono , Picea koraiensis, P. jezoensis andAbies nephrolepis . 21,382 individuals with DBH ≥ 1 cm were recorded in the plot in 2010,belonging to 48 species, 35 genera and 20 families. According to their life forms, therewere 27 tree species, 19 shrub species and 2 vine species. The maximum DBH in the plotwas 133 cm, the mean DBH and basal area was 7.41 cm and 42.30 m 2 /ha, respectively.The 9.12-ha plot was established in 2006. The dominant species included A. nephrolepis,Picea koraiensis , A. ukurunduense , Larix gmelinii and Alnus sibirica . 37,873 individualswith DBH ≥ 1 cm were recorded in the plot in 2011, belonging to 44 species, 30 generaand 15 families. According to their life forms, there were 29 tree species, 14 shrub4