不同林龄杉木组织迁移养分的再利用

吕中诚,康文星,黄志宏,赵仲辉,邓湘雯

Reuse of retranslocated nutrients in tissues of Chinese fir in plantations of different ages

LÜ Zhong-Cheng,KANG Wen-Xing,HUANG Zhi-Hong,ZHAO Zhong-Hui,DENG Xiang-Wen

表5 杉木林生产1 t整树干物质所需养分及来源

Table 5 Nutrients and sources needed for producing 1 t dry biomass in Chinese fir plantations

林龄 Stand age (a) 养分来源 Source of nutrients 养分元素 Nutrient elements (kg·hm-2·a-1) 合计 Total (kg·hm-2·a-1) 磷 Phosphorus 氮 Nitrogen 钾 Potassium 钙 Calcium 镁 Magnesium 1-7 土壤中吸收 Absorbed from the soil 0.44 4.73 3.26 4.62 1.20 14.25 衰老枝叶回流 Return from senescent branches and leaves 0.03 0.21 0.23 0.03 0.02 0.52 TPGM 0 0 0 0 0 0 合计 Total 0.47 4.94 3.49 4.65 1.22 14.77 8 -11 ASNAPGM 0.50 5.17 3.08 4.83 1.42 15.00 衰老枝叶回流 Return from senescent branches and leaves 0.06 0.52 0.47 0.08 0.04 1.17 TPGM 0 0 0 0 0 0 合计 Total 0.56 5.69 3.55 4.91 1.46 16.17 12-16 土壤中吸收 Absorbed from the soil 0.37 4.44 2.50 4.39 1.23 12.93 衰老枝叶回流 Return from senescent branches and leaves 0.10 0.84 0.73 0.14 0.05 1.86 TPGM 0.05 0.10 0.13 0.14 0.10 0.52 合计 Total 0.52 5.38 3.36 4.67 1.38 15.31 17-20 土壤中吸收 Absorbed from the soil 0.26 3.44 1.90 3.23 0.90 9.73 衰老枝叶回流 Return from senescent branches and leaves 0.12 0.89 0.72 0.16 0.04 1.93 TPGM 0.05 0.11 0.10 0.07 0.08 0.41 合计 Total 0.43 4.44 2.72 3.46 1.02 12.07 21-25 从土壤中吸收 Absorbed from the soil 0.24 3.16 1.85 3.06 0.87 9.18 衰老枝叶回流 Return from senescent branches and leaves 0.12 0.96 0.74 0.18 0.03 2.03 TPGM 0.03 0.09 0.07 0.12 0.05 0.36 合计 Total 0.39 4.21 2.66 3.36 0.95 11.57