上海崇明岛水杉人工林生物量方程构建及固碳潜力研究

水杉(Metasequoia glyptostroboides)因其生长快递、冠型优美、适应性强等特点,成为亚热带和温带地区最重要的用材林和景观林树种之一。在本研究中,以上海崇明岛东平国家森林公园不同龄级水杉林分为研究对象,构建水杉人工林异速生长方程,估测幼龄林(8年生)、中龄林(15年生)、成熟林(30年生)3个不同年龄阶段林分地上部分生物量、碳储量和年固碳量,并比较不同龄级林分的固碳能力。结果显示,水杉地上部分生物量及干、枝、叶部分生物量与胸径呈显著指数关系(r2=0.89～0.99,P<0.001)。2011年,水杉幼龄林、中龄林和成熟林地上部分生物量分别为13.11、29.76和64.93t/hm2,地上部分年固碳量分别为3.57、2.41和1.52t/hm2/a。对比相关研究发现,降雨量的差异可能是我国不同地区水杉生物量差异的主要因素。研究结果将为华东地区乃至全国营造和经营管理水杉人工林,尤其是水杉碳汇林,提供基础数据和理论依据。

Allometric Equation-Based Estimation of Biomass Carbon Sequestration in Metasequoia glyptostroboides Plantations in Chongming Island, Shanghai

Metasequoia glyptostroboides is one of most important tree species used for timber-and landscape-based plantations and street trees in subtropical region and warm temperate zones duo to the fast-growing features,beautiful canon-like crown and adaptation for a diversity of climate and site conditions.In this study,sample site in Dongping National Forest Park,Chongming,Shanghai,was investigated,and allometric equations were established.The aboveground biomass,carbon storage and annual aboveground carbon sequestration of young,mid-aged and mature stands were estimated,respectively.The results showed that biomass carbons storage significantly and exponentially correlated with D(r2 = 0.89~0.99,P<0.001).The aboveground biomass carbon storage was 13.11,29.76 and 64.93 t/hm2 in young,mid-aged and mature stands in 2011,respectively.Annual aboveground carbon increment in three stands was 3.57,2.41 and 1.52 t/hm2/a,respectively.Comparative research showed precipitation may be the main factor of biomass difference of Metasequoia glyptostroboides in different areas of China.These results have important theoretical significance and guiding function for studying Metasequoia plantation ecosystem and the management of carbon sink forests.