CAJ | 학술논문

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。
상북경저양적중국성시화지구적쾌속인구화GDP증장이경도치료래자화석연료적대량CO2배방。삼림피인위시최중요적탄회，가이중화탄배방。본연구기우2009년삼림청사수거화삼림식피탄함량，채용생물량확전인자（BEFs）방법평개료북경삼림식피탄저량，이용삼림조락물여삼림생물량적비례이급조락물탄함량계산료조락물탄저량，이용토양후도、용중화SOM함량계산료토양탄저량。아문총결득출，활협림시북경삼림주요탄고，삼림탄저량주요분포재해발<60m적평원지구화60-600m적저산지구。북경삼림탄밀도궤호수착해발증가이증가，단시재해발200-400m지구략유하강，기중식피탄밀도재<60m적평원지구상대교고，저주요시유우탄밀도교고적양수화락협송인공림적비례교고이급관개、시비등촉진식물탄루적적인공관리조시교다；삼림토양탄밀도궤호수착해발증가이증가，저주요시유우토양탄수출수착해발증가이축점하강，인위림하충식、관개화시비가속료저해발지구적토양이양호흡단수착해발증가이하강，동시해발200-800m적저산지구상견적토양침식야회수착림하충식등간우조시적감소이하강。본연구가이위구역삼림생태계통관리자제공보호삼림생태계통화개선삼림탄저량제공과학지식。
Rapid growth in population and gross domestic product in Chinese urban regions such as Beijing has resulted in a large amount of CO2 emissions from fossil fuels. Forests are considered the most important carbon sink to offset these carbon emissions. In this study we estimated forest carbon storage in Beijing using forest inventory data and the biomass expansion factors method. We analyzed trends in the forest ecosystem and its fractions along altitudinal gradients. We concluded that broad-leaved forest is the main forest carbon pool in Beijing, and forest carbon is mainly stored in plains at an altitude of<60 m a.s.l. and in the low mountainous area at an altitude of 60-600 m a.s.l. Forest ecosystem carbon density in Beijing increases with altitudinal gradients but slightly decreases in regions at altitudes that range from 200-400 m a.s.l. Forest vegetation carbon density of the plain area at an altitude of <60 m a.s.l. is much higher than other areas, attributable to the high ratios of the plantation of Populus spp. and Larix principisrupprechtii with higher vegetation carbon densities than others and human practices such as fertilization and irrigation which are beneifcial for vegetation carbon accumulation. The forest soil carbon density in Beijing also increases with increasing altitude, attributable to decreasing soil carbon output with altitude. Management practices such as understory cultivation, irrigation, fertilization and scariifcation directly accelerate carbon emissions from soil heterotrophic respiration which decreases with altitude. Soil erosion in areas that range from 200-800 m a.s.l. also decrease with altitude as management practices decrease. This study will underpin scientiifc knowledge for local forest managers to adopt more appropriate practices to protect forest ecosystems and to improve forest carbon storage.