油松、刺槐与杨树树干材积碳储量动态变化研究

本文结合多学科研究提出了碳储量解析法,对北方人工造林主要树种碳储量及其变化规律进行了研究,旨在从现有人工造林树种中筛选碳汇造林树种并确定森林经营周期。结果表明：1）油松、刺槐和杨树数量成熟龄分别为67、40和30年。2）油松和刺槐木材密度初期呈缓慢增加趋势,到35年时均达到最大。35年后,油松逐渐下降并趋于平稳,刺槐一...

Dynamic changes of carbon storage in trunk volume of Pinus tabulaeformis, Robinia pseudoacacia and Populus euramericana.

In order to select suitable tree species for carbon sink and determine forest management cycle, we used a new analytical method to study carbon storage and its dynamics in major afforestation species in the north of China. Results show that 1) the mature age of Pinus tabulaeformis, Robinia pseudoacacia and Populus euramericana were 67, 40 and 30 years, respectively. 2) Wood density of P. tabulaeformis and R. pseudoacacia presented a slowly-increasing trend in the initial phase and reached the maximum value at age 30. After age 30, wood density of P. tabulaeformis decreased gradually until reaching a stable value, while those of R. pseudoacacia declined continuously. For P. euramericana, wood density increased quickly before age 4, increased slowly from age 4 to 18 and declined from age 18 to 28. 3) The carbon storage of P. tabulaeformis showed a relatively large variation, with the maximum value of 60.52% at age 20 and the minimum value of 46.14% at age 40. In contrast, the carbon storage of R. pseudoacacia varied greatly before age 25 and then became stable, with the maximum value of 56.96% at age 5 and the minimum of 42.58% at age 25. The carbon storage of P. euramericana changed little; it declined slowly from the maximum value of 48.64% to the minimum of 46.64%. 4) The average carbon storage of P. tabulaeformis, R. pseudoacacia and P. euramericana peaked at age 70 (2.5267 kg), 40 (3.7939 kg) and 30 (2.7810 kg), respectively.