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首页> 外文期刊>Tree Physiology >Increased understanding of nutrient immobilization in soil organic matter is critical for predicting the carbon sink strength of forest ecosystems over the next 100 years
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Increased understanding of nutrient immobilization in soil organic matter is critical for predicting the carbon sink strength of forest ecosystems over the next 100 years

机译：对土壤有机质中养分的固定化认识的提高对于预测未来100年森林生态系统的碳汇强度至关重要

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摘要

The terrestrial biosphere is currently thought to be a significant sink for atmospheric carbon (C). However, the future course of this sink under rising [CO2] and temperature is uncertain. Some contrasting possibilities that have been suggested are: that the sink is currently increasing through CO2 fertilization of plant growth but will decline over the next few decades because Of CO2 saturation and soil nutrient constraints; that the sink will continue to increase over the next century because rising temperature will stimulate the release of plant-available soil nitrogen (N) through increased soil decomposition; that, alternatively, the sink will not be sustained because the additional soil N released will be immobilized in the soil rather than taken up by plants; or that the sink will soon become negative because loss of soil C through temperature stimulation of soil respiration will override any CO2 or temperature stimulation of plant growth.
机译：目前认为陆地生物圈是大气中碳（C）的重要汇。但是，在[CO2]升高和温度升高的情况下，该汇的未来走向尚不确定。已经提出了一些相反的可能性：目前，通过植物生长的CO2施肥，水库正在增加，但由于CO2饱和和土壤养分的限制，其在未来几十年内将减少;在下一个世纪，水槽将继续增加，因为温度升高将通过增加的土壤分解而刺激植物可利用的土壤氮（N）的释放;另外，由于释放的额外土壤氮将被固定在土壤中而不是被植物吸收，因此汇将无法维持。或认为汇将很快变为负值，因为通过温度对土壤呼吸的刺激而造成的土壤碳损失将超过任何二氧化碳或植物生长的温度刺激。

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