燕山北部山地人工林和天然次生林的生物碳贮量

为了了解人工林与天然次生林碳汇功能的差异,以燕山北部山地华北落叶松人工林和杨桦天然次生林为研究对象,对不同年龄阶段的两种林分的生物碳贮量进行了研究。结果表明:13、18、28 a生杨桦天然次生林总生物碳贮量分别为27.33、35.77、46.13 t/hm²,9、13、30 a华北落叶松人工林分别为21.97、34.14、55.62 t/hm²; 0~13 a,14~18 a,19~28 a杨桦林生物总碳贮量的年碳积累速率分别为2.10、1.69、1.04 t/hm², 0~9 a,10~13 a,14~30 a落叶松林分别为2.44、3.04、1.34 t/hm²;华北落叶松单木生物量增长速率明显高于白桦和山杨,在10~25 a的年龄段,落叶松生长速度是白桦、山杨的1.63~5.83、2.26~7.87倍;华北落叶松的BCEF(生物量转化和扩展因子)和BEF(生物量扩展因子)随年龄和胸径的增长有逐渐降低的趋势,而白桦和山杨的两个参数则有逐渐增加的趋势。由此得出结论,在燕山北部山地,与杨桦天然次生林相比,华北落叶松人工林表现出更强的碳吸存能力,该地区大面积的华北落叶松幼、中龄林具有巨大的碳汇潜力;同时,使用生物量碳计量参数时应考虑树种、林龄和胸径的差异。

Biological Carbon Storage of Plantation and Natural Secondary Forest in North Region of Yanshan Mountain

In order to understand the difference between plantation and secondary forest as a carbon sink,we chose an age sequence of Larix principis-rupprechtii plantation and secondary poplar-birch forest respectively for the study of biological carbon storage in north region of Yanshan Mountain.Result showed that: Total biological carbon storages in 13-,18-,and 28-year old secondary poplar-birch forest are 27.33,35.77,46.13 t/hm2,and 9-,13-,and 30-year old Larix principis-rupprechtii plantation are 21.97,34.14,55.62 t/hm2,respectively.Yearly carbon accumulation rates in secondary forest are 2.10,1.69,1.04 t/hm2 for 0-13,14-18,and 19-28 years stand respectively.And the rates in plantation are 2.44,3.04,1.34 t/hm2 for 0-9,10-13,and 14-30 years stand respectively.Larix principis-rupprechtii have a high speed individual tree biomass accumulation.At tree age of 10-25,individual tree biomass accumulation rate in Larix principis-rupprechtii is 5.83-1.63,7.87-2.26 times faster than in birch and in poplar respectively.Biomass conversion and expansion factor(BCEF) and biomass expansion factor(BEF) for Larix principis-rupprechtii decreases gradually with increasing age and DBH,but increases gradually for the two factors of birch and poplar.It is concluded that compared with secondary poplar-birch forest in north region of Yanshan Mountain,Larix principis-rupprechtii plantations have a powerful carbon sequestration capacity and have huge carbon storage potential for the existence of massive young and middle age trees.Application of biomass factors should consider the effect of tree species,age and DBH.