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首页> 外文期刊>Pedobiologia >American chestnut soil carbon and nitrogen dynamics: Implications for ecosystem response following restoration
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American chestnut soil carbon and nitrogen dynamics: Implications for ecosystem response following restoration

机译：美国栗子土壤碳和氮动力学：恢复后生态系统反应的影响

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摘要

American chestnut (Castenea dentata), once dominant throughout the eastern deciduous forest of North America, was extirpated from its native range by chestnut blight fungus. Through development of blight-resistant trees, the reintroduction of chestnut is likely, though little is known about the biogeochemistry of forests influenced by chestnut. We performed a one-year laboratory incubation experiment with soil and litter from 10-year-old monoculture plantings of pure American chestnut, black cherry, and northern red oak, in addition to a field-based C-13 isotopic analysis of soil C. Parameters included litter decomposition, C respiration, N leaching, soil oxidizable C, extracellular enzyme activity related to nutrient acquisition, and litter chemistry. Results indicate that chestnut litter decayed more rapidly than that of oak or cherry (19.0%, 10.8%, 14.1% mass loss in chestnut, oak, and cherry litter, respectively). Chestnut had lower N leaching rates than soils beneath oak or cherry (7.8, 11.5, and 12.0 mg N kg(-1) in chestnut, cherry, and oak soils, respectively), greater dissolved organic C (DOC) in leachate than soils influenced by oak (32.2 and 26.4 mg kg(-1) in chestnut and oak soil, respectively). No differences in soil respiration or total soil C by species were detected. We conclude that surface soils influenced by chestnut have large inputs of C through rapid litter decomposition and low inorganic N availability, indicating potential for accumulation of C in surface soil over the long-term.
机译：美国栗子（Castenea Dentata）曾经占据了北美东部落叶林的占主导地位，由栗子枯萎真菌突出。通过抗灼热的树木的发展，栗子的重新引入可能，尽管对受栗子影响的森林生物化学性质知之甚少。除了基于田间的C-13土壤C-13同位素分析外，我们对10岁的单一种植园的10岁的单一种植园进行了一年的土壤和垃圾的一年的实验室孵化试验。参数包括凋落物分解，C呼吸，N浸出，土壤可氧化C，与营养采集相关的细胞外酶活性，以及​​凋落物化学。结果表明，栗子凋落物腐烂比橡木或樱桃的速度越来越快（分别为19.0％，10.8％，栗子，橡木和樱桃窝量的19.0％，10.8％，14.1％损失）。栗子在橡木下面的土壤中具有较低的N浸出率（分别在栗子，樱桃和橡木土壤中的樱桃（7.8,11.5和12.0mg（-1）），渗滤液中的更大的溶解有机C（Doc）比受影响的土壤橡木（32.2和26.4毫克KG（-1）分别在栗子和橡木土壤中）。检测到土壤呼吸或物种的总土壤C没有差异。我们得出结论，通过快速凋落物分解和低无机N可用性，对栗子影响的表面土壤具有大量的C输入，表明长期地面土壤中C的积累潜力。

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