摘要
广泛栽种于西藏尤其是雅鲁藏布江流域的杨树林,占到西藏人工林面积的45.34%,在碳汇和释氧上发挥了重要的作用。雅鲁藏布江中游地区的杨树林分布面积、平均年龄、碳密度和碳汇均为全区最大。以银白杨、新疆杨、北京杨和藏川杨为例,分析碳密度影响因素,可知:银白杨、新疆杨碳累积速度快;4个树种碳汇均随经度的增加而增加,纬度影响银白杨、新疆杨、北京杨的碳汇;藏川杨碳汇与距水域的距离、太阳总辐射呈负相关,北京杨碳汇与海拔呈负相关。通过不同区域、不同树种的碳密度模型,掌握不同因素对碳密度的影响,可为各区域树种、造林地选择、森林经营及固碳增汇评估提供科学的参考依据。
Poplar forests,which are widely planted in Tibet,especially in Brahmaputra Watershed,account for 45.34%of the area of Tibetan plantation forest,and play an important role in carbon sink and oxygen release.The distribution area,average age,carbon density and carbon sink of poplar forests in the middle reaches of Brahmaputra Watershed are the largest in Tibet.Taking silver poplar,Xinjiang poplar,Beijing poplar,and Tibetan Sichuan poplar as examples,the analysis of carbon density influencing factors shows that:silver poplar and Xinjiang poplar have a fast carbon accumulation rate;the carbon sinks of the four tree species all increase with the increase in longitude,and latitude affects the carbon sinks of silver poplar,Xinjiang poplar,and Beijing poplar;Tibetan Sichuan poplar carbon sink is negatively correlated with distance from water and total solar radiation,and Beijing poplar carbon sink is negatively correlated with altitude.Through carbon density models of different regions and different tree species,grasping the influence of different factors on carbon density,a scientific reference basis for tree species and afforestation land selection,forest management,and assessment of carbon sinks in each region will be provided.
作者
刘金山
张蓓
刘寅学
LIU Jinshan;ZHANG Bei;LIU Yinxue(Central South Inventory and Planning Institute of National Forestry and Grassland Administration,Changsha 410014,Hunan,China)
出处
《中南林业调查规划》
2021年第1期45-48,共4页
Central South Forest Inventory and Planning
关键词
人工林
新疆杨
藏川杨
林龄
碳密度
plantation forest
Xinjiang poplar
Tibetan Sichuan poplar
forest age
carbon density
