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针对森林生态系统的碳密度估算精度低的问题,以山西的油松人工林和天然林为对象,在林分尺度上采用实测样地数据和异速生长方程相结合的方法,分析了油松幼龄林和中龄林生态系统各组分的碳密度及分布特征.结果表明,(1)人工幼龄林(AY)、人工中龄林(AM)、天然幼龄林(NY)和天然中龄林(NM)生态系的统碳密度分别为44538.05kg/hm2、90314.68kg/hm2、119928.99kg/hm2和261036.39kg/hm2;(2)相应的4种生态系统中乔木层碳密度所占的百分比分别为12.99%、34.51%、26.25%和45.34%,灌草层和凋落物层碳密度合占的百分比分别为0.77%、3.96%、9.71%和2.98%,土壤层碳密度所占的百分比分别为86.24%、61.53%、64.04%和51.68%;(3)山西油松林生态系统碳密度平均为127525.25kg/hm2低于全国油松林平均值,但0—100cm土壤层平均碳密度76975kg/hm2与全国的平均水平相当,反映出林分的质量不高需要采取抚育措施;(4)采用林分尺度调查与异速生长方程相结合的方法,比采用材积源生物量法推算乔木层的生物量估算森林整体碳密度法具有更高精度.
Aiming at the problem of low estimation accuracy of carbon density in forest ecosystem, taking Pinus tabulaeformis plantation and natural forest in Shanxi as an object, this paper analyzed the relationship between Pinus tabulaeformis The results showed that: (1) Artificial young forest (AY), artificial middle-aged forest (AM), natural young forest (NY) and natural The unified carbon density of middle-aged forest (NM) ecosystem was 44538.05kg / hm2, 90314.68kg / hm2, 119928.99kg / hm2 and 261036.39kg / hm2, respectively. (2) The carbon density of tree layer in the four kinds of ecosystems The percentage of carbon density in shrub layer and litter layer were 0.77%, 3.96%, 9.71% and 2.98% respectively, and the percentage of carbon density in soil layer was 12.99%, 34.51%, 26.25% and 45.34% (3) The average density of Pinus tabulaeformis forest ecosystem in Shanxi Province is 127525.25kg / hm2, which is lower than the average value of national pine forest, but the average carbon density in 0-100cm soil layer is 76975kg / hm2 and the national average, reflecting the quality of the forest is not high need to take tending measures; (4) the use of forest The method of combining the scale survey and allometric growth equation is more accurate than estimating the biomass of arbor layer by using the biomass source method.