1987年大兴安岭林火碳释放及火后NPP恢复

以大兴安岭地区1985年一类森林资源连续清查资料和1987年林火资料为数据基础,结合GIS技术,进行大兴安岭1987年林火碳释放及火后净初级生产力(NPP,net primary productivity)恢复的研究.通过对1987年火烧迹地林火发生前各树种的生物量的估算,得出在1987年林火中大兴安岭林区森林释放的碳量约为1.97×10~6～2.47×10~6 t;同时分别比较火烧中各树种的碳释放量和不同火烧等级下的碳释放量.结果表明:落叶松在1987年林火中释放碳量约0.96×10~6～1.19×10~6 t,占碳释放总量的49%左右;重度火灾中碳释放量占总碳释放量的99.4%.火后乔木层的NPP恢复在21年间成逐渐增加的趋势,并且恢复趋势表明在火后23～24年的时候中度火灾后的乔木层NPP可达到未过火林地的水平.

Carbon Emission and Dynamic of NPP post Forest Fires in 1987 in Daxing'an Mountains

Based on the consecutive forest resources inventory data collected in 1985, and the forest fire data in Daxing'an Mountains occurred in 1987, the carbon emission and the dynamic of the NPP following the forest fire were studied by the GIS.In this study the forest biomass before the fire was calculated in order to estimate the carbon emissions during the period of catching fire. The estimated emitted carbon was around 1.97 × 10~6 ～ 2.47 × 10~6 t. Furthermore, the carbon emissions of different arbor species at different grade of fires were compared respectively. The result indicated that the carbon emissions of L.gmelinii was about 0.96 × 10~6 ～ 1.19 × 10~6 t, accounted for 49% of the total. The carbon emission in the area burned by severely fire was above 99% of the total carbon emissions. The NPP has been gradually growing over the last 21 years since the forest fire and currently the NPP of the burned area has already reached to the level of the unburned area.