Effects of Stand Origin and Near-Natural Restoration on the Stock and Structural Composition of Fallen Trees in Mid-Subtropical Forests
Effects of Stand Origin and Near-Natural Restoration on the Stock and Structural Composition of Fallen Trees in Mid-Subtropical Forests
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DOI：
10.3390/f6124380
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发表时间：
2015-12
期刊：
影响因子：
2.9
通讯作者：
Chunsheng Wu;Xiaohua Wei;Qifeng Mo;Qinglin Li;Xiaodong Li;Chunjie Shu;Liangying Liu;Yuan-qiu Liu-Yuan-qi
中科院分区：
文献类型：
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作者：
Chunsheng Wu;Xiaohua Wei;Qifeng Mo;Qinglin Li;Xiaodong Li;Chunjie Shu;Liangying Liu;Yuan-qiu Liu-Yuan-qi
倒下的树木是森林生态系统的重要组成部分，在维持森林生物多样性和树木再生方面发挥着核心作用。然而，林分起源和近自然恢复对砍伐树木生物量和碳储量的影响尚不清楚。通过对江西省中亚热带森林60个样地的野外调查，研究了人工针叶林（Acf）、天然针叶林（Ncf）（如不同林分来源）和天然常绿阔叶林（Nebf）（如近自然恢复）中树木的蓄积量和结构组成。结果表明：(1)在Nebf、Ncf和Acf三种森林类型中，Nebf的凋落树木生物量和碳储量最大；(2)天然杉木林（Nclf）的倒下树生物量和碳储量显著大于人工杉木林（Aclf），天然马尾松林（Npf）的倒下树生物量和碳储量也显著大于人工马尾松林（Apf）；(3)天然林的径级分配比人工林更均匀；(4)在林分类型内和林分类型内，不同林分类型的凋落林木生物量差异不显著；中度和重度凋落树木的生物量在不同林分（Aclf vs. Nclf, Apf vs. Npf）之间存在显著差异，但在同一林分的不同林分类型（Aclf vs. Apf, Nclf vs. Apf）之间差异不显著。研究结果表明，Nebf地区大量的树木生物量和碳储量可能在减缓全球变暖和中亚热带森林碳循环中发挥重要作用。因此，林分起源和近自然恢复对中亚热带森林砍伐树木的碳储量和结构组成有显著影响。
Fallen trees comprise an important part of forest ecosystems and serve a central role in maintaining the biodiversity and tree regeneration of forests. However, the effects of stand origin and near-natural restoration on the biomass and carbon stock of fallen trees remain unclear. Based on 60 sampling plots of field surveys of mid-subtropical forests in Jiangxi Province, we investigated the stock and structural composition of fallen trees in artificial coniferous forests (Acf), natural coniferous forests (Ncf) (e.g., different stand origins) and natural evergreen broadleaf forests (Nebf) (e.g., near-natural restoration). The following results were obtained: (1) the largest biomass and carbon stocks of fallen trees among three forest types (Nebf, Ncf and Acf) were measured for Nebf; (2) the fallen tree biomass and carbon stock in natural Cunninghamia lanceolata forest (Nclf) were significantly larger than that in artificial Cunninghamia lanceolata forest (Aclf), and the fallen tree biomass and carbon stock in natural Pinus massoniana forest (Npf) were also significantly larger than those in artificial Pinus massoniana forest (Apf); (3) the diameter class allocation in natural forests was more uniform than that in artificial forests; (4) the biomass of fallen trees with mild decay was not significantly different among forest types within stand origin or among the stand origin within forest types; however, the biomass of fallen trees with moderate and heavy decay significantly differed among stand origin (Aclf vs. Nclf, Apf vs. Npf), but was not significant among the forest types (Aclf vs. Apf, Nclf vs. Apf) within a stand origin. Our results suggested that the large biomass and carbon stock of fallen trees in Nebf may serve a significant role in mitigating global warming and carbon cycles in mid-subtropical forests. Therefore, stand origin and near-natural restoration exert significant effects on the carbon stock and structural composition of fallen trees in mid-subtropical forests.