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像北京这样的中国城市化地区的快速人口和GDP增长已经导致了来自化石燃料的大量CO2排放。森林被认为是最重要的碳汇,可以中和碳排放。本研究基于2009年森林清查数据和森林植被碳含量,采用生物量扩展因子(BEFs)方法评价了北京森林植被碳储量,利用森林凋落物与森林生物量的比例以及凋落物碳含量计算了凋落物碳储量,利用土壤厚度、容重和SOM含量计算了土壤碳储量。我们总结得出,阔叶林是北京森林主要碳库,森林碳储量主要分布在海拔<60m的平原地区和60-600m的低山地区。北京森林碳密度几乎随着海拔增加而增加,但是在海拔200-400m地区略有下降,其中植被碳密度在<60m的平原地区相对较高,这主要是由于碳密度较高的杨树和落叶松人工林的比例较高以及灌溉、施肥等促进植物碳累积的人工管理措施较多;森林土壤碳密度几乎随着海拔增加而增加,这主要是由于土壤碳输出随着海拔增加而逐渐下降,因为林下种植、灌溉和施肥加速了低海拔地区的土壤异氧呼吸但随着海拔增加而下降,同时海拔200-800m的低山地区常见的土壤侵蚀也会随着林下种植等干扰措施的减少而下降。本研究可以为区域森林生态系统管理者提供保护森林生态系统和改善森林碳储量提供科学知识。
Rapid population growth and GDP growth in China’s urban areas like Beijing have led to massive CO2 emissions from fossil fuels. Forests are considered to be the most important carbon sinks that can neutralize carbon emissions. In this study, based on forest inventory data and forest carbon content in 2009, the biomass expansion factor (BEFs) method was used to evaluate the forest carbon storage in Beijing. The litterfall was calculated using the ratio of forest litter to forest biomass and litter carbon content Carbon storage, soil carbon storage was calculated using soil thickness, bulk density and SOM content. We conclude that broad-leaved forests are the major forest carbon stocks in Beijing. Forest carbon stocks are mainly distributed in plains <60 m above sea level and in low-lying areas of 60-600 m. The forest carbon density in Beijing increased almost as the altitude increased, but declined slightly in the area of 200-400m above sea level. The vegetation in which the density of carbon in the plain was less than 60m was relatively high mainly due to the high density of poplar and larch The higher proportion of forest and the man-made management measures such as irrigation and fertilization to promote the accumulation of plant carbon are more; the carbon density of forest soil increases with the elevation almost, mainly due to the gradual decline of soil carbon output with the elevation, Under the conditions of planting, irrigation and fertilization, the soil oxygen respiration at low altitude accelerated, but decreased with the altitude increasing. At the same time, the common soil erosion in low mountain areas with elevation of 200-800 m decreased with the reduction of planting measures decline. This study can provide scientific information to regional forest ecosystem managers on the protection of forest ecosystems and improvement of forest carbon stocks.