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[目的]研究中亚热带地区的江西省内不同森林类型、林分类型林内倒木的生物量、碳储量及其数量特征分布格局,为该区域森林生态系统功能评估积累基础数据。[方法]以亚热带典型森林133个样地为研究对象,采用实测法对样方内直径≧1 cm,长度≧1 m的倒木逐一测量其中央直径和长度,并记录其分解程度和树种组成。[结果]表明:杉木林和马尾松林倒木生物量和碳储量分别为0.684 t·hm~(-2)、0.279 tc·hm~(-2)和0.553 t·hm~(-2)、0.207 tc·hm~(-2),常绿阔叶林和次生常绿阔叶林分别为11.293 t·hm~(-2)、4.781 tc·hm~(-2)和1.888 t·hm~(-2)、0.812 tc·hm~(-2),松阔混交林和杉阔混交林分别为1.248 t·hm~(-2)、0.521 tc·hm~(-2)和1.28 t·hm~(-2)、0.432 tc·hm~(-2);针叶林中Ⅱ、Ⅲ径级倒木生物量较大且与其他两个径级差异显著,针阔混交林中Ⅱ径级倒木与Ⅰ、Ⅲ径级倒木生物量差异显著,常绿阔叶林林内Ⅰ径级倒木生物量与Ⅱ、Ⅲ、Ⅳ和Ⅴ径级差异显著。杉木林和马尾松林中度分解倒木生物量最大分别为0.332 t·hm~(-2)、0.321 t·hm~(-2),且分别显著大于相应林分类型中的轻度和重度分解倒木;常绿阔叶林表现出同样的变化规律。[结论]中亚热带地区典型针叶林和常绿阔叶林中不同林分类型之间倒木生物量差异显著,而针阔混交林差异不显著。3种森林类型(针叶林、常绿阔叶林和针阔混交林)中不同林分类型之间倒木碳储量差异显著。江西森林倒木主要分布在5 10 cm和10 15 cm的Ⅱ、Ⅲ径级,且主要处于中度分解等级。针阔混交林(松阔和杉阔)倒木主要分布在海拔700 m以下,常绿阔叶林倒木分布在海拔650 m以上。研究结果表明,常绿阔叶林倒木由于其较大的生物量和碳储量可能会在缓解全球气候变暖和碳循环中扮演重要的作用,且在未来的森林经营和管理中应该重视倒木对森林可持续发展的重要性。
[Objective] The research aimed to study the distribution patterns of biomass, carbon storage and its quantitative characteristics of fallen forest in different forest types and forest types in Jiangxi Province in the middle subtropical region, accumulating basic data for the functional assessment of forest ecosystems in this region. [Method] With 133 plots of typical subtropical forests as the research object, the inverted centimeter with the diameter of ≧ 1 cm and the length of ≧ 1 m in the quadrats was measured by measuring the central diameter and length one by one and the degree of decomposition and species composition were recorded. [Result] The results showed that the biomass and carbon storage of the fallen wood of Cunninghamia lanceolata and Pinus massoniana forest were 0.684 t · hm -2, 0.279 tc · hm -2 and 0.553 t · hm -2, 0.207 tc · Hm ~ (-2), and the values of the total area of evergreen broad-leaved forest and secondary evergreen broad-leaved forest were 11.293 t · hm -2, 4.781 tc · hm -2 and 1.888 t · hm ~ 2) and 0.812 tc · hm -2, respectively. The broad-leaved and mixed Chinese fir and broad-leaved mixed forest were 1.248 t · hm -2, 0.521 tc · hm -2 and 1.28 t · hm ~ -2) and 0.432 tc · hm -2, respectively. In the coniferous forest, the biomass of fallen grade Ⅱ and Ⅲ was larger than that of the other two grades. In the coniferous and broadleaf mixed forest, There was significant difference in the biomass of inverted wood, and there was significant difference in the biomass of Ⅰ size inverted wood and Ⅱ, Ⅲ, Ⅳ and Ⅴ in the evergreen broad-leaved forest. The maximum decomposition mass of the inverted wood of Chinese fir and Pinus massoniana forest was 0.332 t · hm -2 and 0.321 t · hm -2, respectively, which were significantly greater than those of the light and severely decomposed fallen trees ; Evergreen broad-leaved forest showed the same variation. [Conclusion] There was significant difference in the inverted wood biomass between the different forest types in the typical coniferous forest and the evergreen broad - leaved forest in the subtropical region, but not in the mixed coniferous and broad - leaved forest. There was significant difference in inverted wood carbon storage among the three forest types (coniferous forest, evergreen broad-leaved forest and mixed coniferous and broadleaf forest). Jiangxi down forest wood was mainly distributed in the 5 10 cm and 10 15 cm Ⅱ, Ⅲ diameter class, and mainly in the moderate decomposition level. The coniferous and broad-leaved mixed forest (Pinus brook and Cedar broadleaved) fallen wood mainly distributed below 700 m above sea level, and the fallen wood of evergreen broad-leaved forest distributed above 650 m above sea level. The results show that because of its large biomass and carbon storage, inverted wood of evergreen broad-leaved forest may play an important role in alleviating global warming and carbon cycle. In future forest management and management, The importance of sustainable development.