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准确量化森林碳密度和净初级生产力(NPP)对于评价森林生态系统在全球碳循环中的作用至关重要.本研究以小兴安岭原始阔叶红松林和择伐(择伐强度30%,择伐对象为大径级红松)34年后的阔叶红松林为对象,采用样地清查和异速生长方程法测定了不同林分的碳密度和NPP.结果表明:原始林和择伐林的碳密度总量分别为(397.95±93.82)和(355.61±59.37)t C·hm-2,其中植被碳密度、碎屑碳密度、土壤碳密度分别占总碳库的31.0%、3.1%、65.9%和31.7%、2.9%、65.4%,两者的总碳密度和各组分的分配比例均无显著差异.原始林和择伐林的NPP总量分别为(6.27±0.36)和(6.35±0.70)t C·hm-2·a-1,乔木层、灌木和草本层、细根所占比例分别为60.3%、2.0%、37.7%和66.1%、2.0%、31.2%,两者的总NPP和各组分的贡献率均无显著差异.而原始林和择伐林中针、阔叶的NPP比例分别为47.24∶52.76和20.48∶79.52,两者差异显著.择伐34年后阔叶红松林的碳密度和NPP均达到了择伐前水平.
Accurate quantification of forest carbon density and net primary productivity (NPP) is crucial to evaluate the role of forest ecosystems in the global carbon cycle.In this study, the original broad-leaved Korean pine forests and selective cutting (30% selective cutting, (Pinus koraiensis), a large-diameter Pinus koraiensis forest, was selected as the study object to study the carbon density and NPP of different stands in the broad-leaved Korean pine forest. The results showed that: (397.95 ± 93.82) and (355.61 ± 59.37) t C · hm-2, respectively, of which the vegetation carbon density, debris carbon density and soil carbon density accounted for 31.0%, 3.1% and 65.9% of the total carbon pool, And 31.7%, 2.9% and 65.4%, respectively, and there was no significant difference in the total carbon density and the distribution ratio of the two components.The total NPP amounts in the primary forest and the selective forest were (6.27 ± 0.36) and (6.35 ± 0.70 ) t C · hm-2 · a-1. The proportion of fine roots in tree, shrub and herb layers was 60.3%, 2.0%, 37.7% and 66.1%, 2.0% and 31.2% And the contribution rate of each component had no significant difference.While the proportion of NPP in needles and broadleaved leaves of primary forest and selective deforested forest were 47.24:52.76 and 20.48:79.52 respectively, After 34 years, the carbon density and NPP of broad-leaved Korean pine forests reached the pre-selection level.