Wood Quality Analysis and Excellent Germplasm Screening of Cunninghamia lanceolata

In order to explore the variation of wood quality among different Cunninghamia lanceolata families, in 2015-2019, nine C.lanceolata families of 31-year-old were selected as experimental subjects in Xishan Forest Farm of Rong'an County, and six wood quality evaluation indexes were analyzed by variance analysis, cluster analysis and subordinate function analysis.The results showed that the wood properties and growth of 31-year-old C.lanceolata were significantly different among families, and there was a certain correlation among the wood quality indexes.The average values of tracheid length, tracheid width, tracheid length-width ratio, height, diameter and volume of 31-year-old C.lanceolata were 2750.51 μm, 33.27 μm, 84.93, 26.36 m, 18.43 cm and 0.398 m³ respectively.The results of cluster analysis showed that at the Euclidean distance of 5.0, 9 families of 31-year-old were divided into three categories.The growth of C.lanceolata in group I was the best, and the wood properties of C.lanceolata in group Ⅲ were the best.The families with good wood quality were obtained through comprehensive evaluation: SM₈, SM₃ and SM₄.The average values of tracheid length, tracheid width, tracheid length-width ratio, height, diameter and volume were 2859.82 μm, 34.20 μm, 85.91, 28.22 m, 19.67 cm and 0.465 m³ respectively.The selected excellent families are the optimal germplasm for the wood quality of C.lanceolata, which can provide excellent germplasm resources for the collection, preservation and utilization of C.lanceolata germplasm resources.