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Controls on decomposition and soil nitrogen availability at high latitudes

机译：在高纬度地区控制分解和土壤氮素的利用

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摘要

At high latitudes, decomposition rates and soil nitrogen (N) availability are pivotal in determining ecosystem responses to climate change. The effects of temperature, soil moisture content, resource quality, and saprotrophic fungi as an example of soil organisms, on carbon (C) and N mineralisation are reviewed. The controls on N availability are less well characterised than those on decomposition, and C and net N mineralisation sometimes do not respond to these controls in a parallel manner. Increases in mean summer temperatures of 2–4°C predicted for high latitudes may not necessarily cause greater rates of decomposition and N mineralisation because of concomitant small rises in soil temperature together with interactions between the controls, including interactions of the temperature and moisture content of the substrata with the diversity and function of decomposer fungi. Research on decomposition and soil N availability has been carried out at several scales, at all of which future research remains necessary. It is not clear whether species diversity of decomposer fungi influences decomposition and C and N release above the microscale.
机译：在高纬度地区，分解速率和土壤氮（N）的可用性对于确定生态系统对气候变化的响应至关重要。综述了温度，土壤水分含量，资源质量以及作为土壤生物实例的腐生真菌对碳（C）和氮矿化的影响。对氮有效性的控制不如对分解的控制好，并且碳和净氮矿化有时无法以并行方式响应这些控制。预计高纬度地区夏季平均气温升高2-4°C，不一定会导致分解和氮矿化的增加，这是因为土壤温度伴随着温度的小幅升高以及控制之间的相互作用，包括温度和水分的相互作用。具有分解真菌功能和多样性的基质。分解和土壤氮素有效性的研究已经在多个层面上进行，所有这些都需要进一步的研究。尚不清楚分解真菌的物种多样性是否会影响分解以及微尺度以上的C和N释放。

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