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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。
Metasequoia glyptostroboides has become one of the most important timber and landscape tree species in the subtropical and temperate regions due to its characteristics of fast growing, graceful crown and adaptability. In this study, we took the different age-class Metasequoia forests in Dongping National Forest Park of Chongming Island in Shanghai to study the allometric growth equation of Metasequoia glyptostroboides. The results showed that young trees (8 years old), middle ages (15 years old) The biomass, carbon storage and annual carbon sequestration of above-ground parts of mature forest (30-year-old) were compared in three different ages and the carbon sequestration ability of different age-class stands was compared. The results showed that the biomass of some parts of Metasequoia glyptostroboides and the biomass of stems, branches and leaves had a significant exponential relationship with DBH (r2 = 0.89-0.99, P <0.001). In 2011, the aboveground biomass of the young, middle-aged and mature forests of Metasequoia was 13.11, 29.76 and 64.93 t / hm2, respectively, and the annual aboveground carbon sequestration was 3.57, 2.41 and 1.52 t / hm2 / a, respectively. In contrast, the correlation study shows that the difference of rainfall may be the main factor of Metasequoia biomass difference in different areas of China. The results will provide basic data and theoretical basis for the establishment and management of Metasequoia fir plantation, especially Metasequoia carbon sink forest in Eastern China and the whole country.