Linking litter production, quality and decomposition to vegetation succession following agricultural abandonment
Linking litter production, quality and decomposition to vegetation succession following agricultural abandonment
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将垃圾产生、质量和分解与农业废弃后的植被演替联系起来
DOI：
10.1016/j.soilbio.2012.08.005
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发表时间：
2013-02
影响因子：
9.7
通讯作者：
Quanfa Zhang
中科院分区：
文献类型：
--
作者：
Haishan Dang;Chen Ye;Yulong Zhang;Quanfa Zhang
由于环境和社会经济原因，全球范围内的农业土地撂荒不断增加，了解其与植被演替相关的关键生态过程（例如碳（C）和氮（N）输入和积累）可以为生态系统管理和温室气体减排提供重要信息。为了更好地了解农业撂荒后地上和地下凋落物动态，我们同时研究了中国秦岭山区农业撂荒后沿次生演替梯度（即草地、灌草地、幼嫩次生林和成熟次生林）生态系统的凋落物和细根产量、质量、分解、碳氮输入。结果表明，植被演替过程中地上木本植物凋落物显着增加，草枯落物显着减少，导致不同演替阶段凋落物总产量和年总C、N输入变化不大，而细根产量、细根生物量、细根生产的C输入随林龄显着增加。凋落物初始碳浓度和细根碳磷比（C:P）分别是解释凋落物和细根分解速率变化的主要因素。植被演替过程中凋落物中碳浓度的增加和细根中碳磷比的增加可能分别导致凋落物和细根分解率的下降。植被演替过程中枯落物的积累可能是由于枯落物质量的变化导致枯落物分解率下降，而不是枯落物产量的增加。我们的结果表明，植被类型的变化对年凋落物总产量和总凋落物碳和氮输入的影响比之前假设的要小得多，而质量和分解率的变化可能在很大程度上影响了农业废弃后二次演替过程中林分地面和土壤中碳的积累。
Agricultural land abandonment has been increasing worldwide for environmental and socio-economic reasons, and knowledge of its key ecological processes (e.g., carbon (C) and nitrogen (N) input and accumulation) in relation to vegetation succession can provide important information for ecosystem management and greenhouse gas emissions mitigation. In order to better understand the above- and belowground litter dynamics following agricultural abandonment, we simultaneously studied the litter and fine root production, quality, decomposition, C and N input in ecosystems along a secondary successional gradient (i.e., grassland, shrub-grass land, young secondary forest, and mature secondary forest) following agricultural abandonment in China's Qinling Mountains. Results showed that the significant increase of aboveground woody plant litter and decrease of grass litter during vegetation succession led little changes in total litter production and annual total C and N input in different succession stages, while the fine root production, fine root biomass, C input from fine root production increased significantly with stand age. The initial litter C concentration and fine root carbon: phosphorous ratio (C:P) were the main factors in explaining the variations of decomposition rates of litter and fine root, respectively. The increasing C concentration in litter and the increasing C:P ratio in fine root during vegetation succession had potentially driven the decreases in litter and fine root decomposition rate respectively. The accumulation of litter standing crop during vegetation succession could be attributed to the decreases in litter decomposition rate partly caused by changes in litter quality, rather than the increases in litter production. Our results imply that the changes in vegetation type have a much smaller role in the annual total litter production and the total litter C and N input than previously assumed, while the changes in quality and decomposition rate may have largely influenced C accumulation in stand floor and soil during secondary succession following agricultural abandonment.
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中国东部亚热带森林次生演替过程中土壤净氮矿化和硝化的时间格局
影响因子：
4.9
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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发表时间：
2002-08
期刊：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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作者：
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