辽东山区落叶松人工林和蒙古栎天然次生林的固碳功能

Carbon Fixation of Larch Plantations and Natural Secondary Forests in Mountainous Regions of Eastern Liaoning

以辽东山区两种主要树种长白落叶松(人工林主要组成树种)和蒙古栎(天然次生林主要组成树种)为研究对象,将林木生长过程转换为林木碳素积累过程,对两树种树干碳素积累过程的特征、各林龄段内树干碳素储量的动态及不同器官碳素储量的格局进行了研究。结果表明:长白落叶松树干连年碳素积累和平均碳素积累都明显快于蒙古栎。长白落叶松碳素快速积累期要比蒙古栎长13 a。长白落叶松树干平均碳素积累量一直领先于蒙古栎,并且25 a之后差距逐渐拉大。根据两树种树干连年和平均碳素积累量曲线拟合得到,长白落叶松碳素积累成熟年龄为59.1 a,蒙古栎为65.5 a。25 a之前蒙古栎树干总碳素储量略大于长白落叶松,26 a之后长白落叶松树干碳素储量大于蒙古栎,而且差距逐渐拉大。长白落叶松46 a时树干碳素总储量为122.89 kg,蒙古栎50 a时为98.11 kg,长白落叶松树干总碳储量是蒙古栎的1.25倍。长白落叶松树干平均碳素密度为329.50 kg.m-3,蒙古栎为428.87 kg.m-3。长白落叶松干、根碳素储量大于蒙古栎,而蒙古栎枝、叶碳素储量大于长白落叶松,长白落叶松平均总碳素储量大于蒙古栎,是蒙古栎的1.3倍。

A study was performed to analyze the characteristics of stem carbon accumulation, the dynamics of stem carbon storage of the forests of different ages, and the patterns of carbon storage in different organs by converting biomass growth into carbon accumulation, using Lar/x olgensis and Quercus mongolica in the mountainous regions of eastern Liaoning Province as the experimental objects. Results showed that the annual carbon accumulation and the average carbon accumulation of L. olgensis stem were both higher than those of Q. mongolica. Curves of annual carbon accumulation showed that the rapid carbon accumulation period of L. olgensis was 13 years longer than that of Q. mongolica. The L. olgensis always kept ahead of Q. mongolica in average carbon accunmlation, and the difference became larger and larger after 25 years. The carbon storage maturity ages of L. olgensis and Q. mongolica were 59.1 and 65.5 respectively. Total carbon storage of Q. mongolica stem was slightly larger than that of L. olgensis before 25 years, while the total carbon storage of L. olgeasis became larger than that of Q. mongolica after 26 years, and their differences grew larger. The total carbon storage of stem of 46- year-old L. olgenzis was 122.89 kg, and that of 50-year-old Q. mongolica was 98.11 kg. Average carbon densities of L. olgensis and Q. mongolica were 329.50 and 428.87 kg · m-3 respectively. The average carbon storage of stem and root of L. olgensis with an average age of 50 years were higher than that of Q. mongolica with an average age of 53 years, while the average carbon storage of leaf and branch of Q. mongolica was larger than that of L. olgensis. The average total carbon storage of L. olgensis was 0.3 times larger than that of Q. mongolica.