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采用树木解析和连续土芯法,估测了20年生水曲柳和落叶松人工林乔木层各部分生物量和生产量,以及两种林分各部分的碳、氮含量及储量.结果表明:水曲柳和落叶松乔木林生物量分别为6815.10和9295.95g·m-2;两树种树干生物量占总生物量的比例均最高,分别为57.32%和58.01%;细根生物量最低,分别为2.67%和1.80%.水曲柳和落叶松的年生产量分别为1618.16和2102.45g·m-2.a-1,其中树干年生产量最高,分别占总生物量的39.34%和46.70%;细根的年生产量较低,分别占总生物量的12.06%和5.25%.水曲柳各器官碳含量低于落叶松,氮含量则高于落叶松;水曲柳林碳储量低于落叶松,而两树种氮储量差别不大.水曲柳分配到地上部分的生物量、生产量以及碳、氮比例均小于落叶松,反映了落叶松在构建地上部分相对于水曲柳的高效性;由于树种之间以及同一树种不同器官之间的碳、氮含量差别显著,精确估计森林碳、氮储量时应分树种和器官进行测定.
Based on tree analysis and continuous soil core method, the biomass and yield of arbor layer of 20-year-old Fraxinus matsutake and Larix gmelinii plantation and the carbon and nitrogen contents and reserves of each part of the two stands were estimated.The results showed that: Fraxinus mandshurica and Larix gmelinii forest biomass were 6815.10 and 9295.95g · m-2, respectively. The trunk biomass of both species accounted for the highest proportion of total biomass, accounting for 57.32% and 58.01% respectively. The fine root biomass was the lowest Which was 2.67% and 1.80%, respectively.The annual production of ash and larch were 1618.16 and 2102.45g · m-2.a-1 respectively, of which the trunk annual production was the highest, accounting for 39.34% and 46.70% of the total biomass respectively The annual production of roots was lower, accounting for 12.06% and 5.25% of the total biomass respectively.The carbon content of each part of Fraxinus mandshurica was lower than that of larch, while the nitrogen content was higher than that of larch.The carbon storage of Fraxinus mandshurica was lower than that of larch, However, the nitrogen reserves of the two tree species were not significantly different.The aboveground biomass, yield and carbon and nitrogen ratios were all less than that of larch, which reflected the efficiency of larch in building aboveground part with ash The differences in carbon and nitrogen contents among species and between different organs of the same species were significant and accurate Estimated forest carbon and nitrogen reserves should be determined by species and organ.