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运用LANDIS Pro 7.0模型,模拟了2000—2200年小兴安岭地区10个阔叶树种地上部分生物量在当前气候条件和不同气候变化情景下的变化状况,并结合各树种的含碳率计算各树种的地上部分固碳速率.结果表明:在模拟初始年份,水曲柳、黄檗、蒙古栎、春榆、色木槭的生物量低所占比例小,枫桦、白桦、山杨生物量较大所占比例较高.先锋树种白桦和山杨的固碳速率在模拟中后期出现先下降后上升的过程;其他阔叶树种的固碳速率变化规律较复杂,蒙古栎和紫椴的固碳速率在整个模拟阶段分别在-0.05~0.25和0.16~1.29 t·hm-2·(10a)-1范围内波动,水曲柳、春榆、色木槭和枫桦的固碳速率在模拟中后期呈先上升后下降的趋势.在模拟的第2(2050—2100年)和第4阶段(2150—2200年),黄檗、黑桦在不同气候变化情景间的固碳速率存在显著差异,其他树种的固碳速率在不同气候条件间无显著差异.小兴安岭地区阔叶树种地上部分固碳速率对未来气候的敏感性存在差异.不同气候变化情景的不确定性对大多数森林乔木树种地上部分固碳速率不会造成显著差异,且气候对森林固碳速率的影响存在时滞效应.
Lands Pro 7.0 model was used to simulate the changes of above-ground biomass of 10 broad-leaved tree species in Xiaoxing’an Mountains from 2000 to 2200 under the current climatic conditions and different climate change scenarios. Based on the carbon content of each tree species, the aboveground biomass Carbon sequestration rate.The results showed that the proportion of low biomass of Fraxinus mandshurica, Huangbai, Quercus mongolica, Ulmus pumila and Acer truncatum was small in the initial years of simulation, and the proportion of biomass of Betula platyphylla, Betula platyphylla, The carbon sequestration rate of Pioneer birch and Populus davidiana increased first and then increased in the middle and late stages of the simulation. The variation of carbon sequestration rate of other broad-leaved species was more complicated, and the carbon sequestration rate of Quercus mongolica and Tilia amurensis was in the whole simulation period Respectively, fluctuated within the range of -0.05 ~ 0.25 and 0.16 ~ 1.29 t · hm-2 · (10a) -1, and the carbon sequestration rates of Fraxinus mandshurica The trend of carbon sequestration of Betula platyphylla and Betula platyphylla in different climate change scenarios was significantly different between the second (2050-2100) and the fourth (2150-2200) years of simulation, and the carbon sequestration rates of other species No significant difference in different climatic conditions. The sensitivity of aboveground carbon sequestration rate to broad-leaved tree species in the Xinganling region is different from that of the future climate.Uncertainty of different climate scenarios will not cause significant differences in the carbon sequestration rates of the aboveground parts of most forest tree species, The effect of the rate has a lag effect.