Growth and Fruiting Characters of Different Pinus koraiensis Stands
SUI Li-Long, WANG Fang, ZHAO Quan-Hu, WANG Tai-Kun, JIANG Xin, WANG Jun, LU Zhi-Min, YANG Yu-Chun
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We took 16 Pinus koraiensis stands in Sanpeng Frorest Tree Improved Variety Bases in Tonghua County, Jilin Province as materials, and investigated their soil physical and chemical properties (pH, electrical conductivity, organic matter, available K, available N, available P, total N and C/N), growth and fruiting traits (tree height, diameter at breast height,the seed production per hectare),and the number of trees perhectare.By variance analysis, all the indices were significantly different (P<0.01) among different stands except available K, C/N and tree height. The coefficients of phynotypic variance of all the indices ranged from 3.59% to 42.04%, which were high variance stands and beneficial for evaluation and selection of superior stands. By correlation analysis,the seed production per hectare was significantly positively correlatedwith tree height (0.267), diameter at breast height (0.259), organic matters (0.306), available N (0.909), available P (0.805), and total N (0.213), but was significantly negatively correlated with the number of trees per hectare. We evaluated the 16 stands with 10% selection rate and the seed production per hectareas selection standard, and the stands 3 206 and 3 308 were selected as superior stands. Compared with the population mean,the soil organic matter was increased by 11.91 g·kg-1, available N was increased by 30.92 mg·kg-1, available P was increased by 13.65 mg·kg-1, total N was increased by 0.4 g·kg-1, the seed production per hectare was increased by 461.35 kg·hm-2, diameter at breast height was increased by 1.9 cm, tree height was increased by 0.69 m, and the number of trees per hectare was decreased by 104. The results would provide a theoretical basis for selecting the appropriate nursing management methods to improve the pine seeds yield and transforming as the fruit forest.