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首页> 外文期刊>Plant and Soil >Fresh root decomposition pattern of two contrasting tree species from temperate agroforestry systems: effects of root diameter and nitrogen enrichment of soil
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Fresh root decomposition pattern of two contrasting tree species from temperate agroforestry systems: effects of root diameter and nitrogen enrichment of soil

机译：温带农林业系统两种对比树种的新鲜根分解模式：根直径和土壤氮富集的影响

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摘要

Fresh tree root decomposition induced by tillage is an important source of soil nutrients in agroforestry systems. Here we examined the effects of tree species, root size and soil N enrichment on fresh root decomposition under laboratory conditions. Fresh roots with two diameters (2 and 2–5 mm) of Populus euramericana cv. ‘N3016’ (poplar) and Pinus tabulaeformis (pine) collected from agroforestry systems in Northeast China were used in the experiment. For each root treatment, four N levels (0, 50, 100 and 150 μg N g−1 soil) were added. We recognized N concentration and C/N ratio as the root quality variables, and determined decomposition rates as cumulative CO2 production and mass loss. Poplar roots had higher N concentration and lower C/N ratio and decomposed faster than pine roots, and smaller roots decomposed faster than the corresponding larger roots. The effect of N addition on root decomposition varied from positive to negligible to negative, and depended on root quality and N addition rates. Increased N availability did not accelerate and even suppressed poplar root decomposition, whereas generally stimulated pine root decomposition. Our results suggest that root quality should be incorporated into the design of agroforestry systems. Moreover, the differential responses of N addition on decomposition of fresh roots with different quality provide insights into soil nutrient management in agroforestry practices.
机译：耕作引起的新鲜树根分解是农林业系统中土壤养分的重要来源。在这里，我们在实验室条件下研究了树种，根系大小和土壤氮富集对新鲜根系分解的影响。具有两个直径（<2和2–5 mm）的欧洲杨的新鲜根。实验中使用了从中国东北农林业系统中收集的“ N3016”（杨）和油松（松）。对于每个根处理，添加了四个氮水平（0、50、100和150μgN g-1 土壤）。我们将氮浓度和碳氮比作为根系质量变量，并将分解速率确定为累积CO2产生和质量损失。杨树根的氮含量较高，C / N比较低，并且分解速度比松树根快，较小的根比相应的较大根分解得快。施氮量对根系分解的影响从正向可忽略不​​计，从负向不等，并取决于根系质量和氮添加速率。氮素利用率的提高并没有促进甚至抑制杨树根分解，而通常会刺激松树根分解。我们的结果表明，根系质量应纳入农林业系统的设计中。此外，氮素添加对不同质量鲜根分解的不同响应为农林业实践中的土壤养分管理提供了见识。

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  • 来源
    《Plant and Soil》 |2011年第2期|p.115-123|共9页
  • 作者

    Rong Mao; De-Hui Zeng; Lu-Jun Li;

  • 作者单位

    Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, China;

    State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Rd, Shenyang, 110164, China;

    Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Cumulative CO2 production; Mass loss; Pinus tabulaeformis; Populus euramericana cv. ‘N3016’; Root quality;

    机译：累积CO2产生;质量损失;油松;欧洲杨（Copulus euramericana cv。） ‘N3016’;根质量;

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