Soil respiration and the global carbon cycle
Soil respiration and the global carbon cycle
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DOI：
10.1023/a:1006247623877
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发表时间：
2000-01-01
期刊：
影响因子：
4
通讯作者：
Andrews, JA
中科院分区：
文献类型：
--
作者：
Schlesinger, WH;Andrews, JA
土壤呼吸是陆地植物固定的二氧化碳返回大气的主要途径。估计大约为75 × 10(15) gC/年，由于地球条件的变化，这种巨大的自然通量可能会增加。本文的目的是为那些担心土壤呼吸变化可能导致地球大气中二氧化碳增加的决策者提供一个简短的科学综述。大气中二氧化碳浓度的上升将增加土壤中二氧化碳的通量，同时在土壤中留下更多的碳储存。传统耕作和气温升高增加了土壤CO2的通量，但没有增加土壤有机质的储量。大气中氮沉降的增加可能导致植被和土壤中碳的固存。陆地生物圈对所有这些因素同时变化的反应尚不清楚，但土壤碳库的大量增加似乎不太可能在下个世纪缓和大气中二氧化碳的上升。
Soil respiration is the primary path by which CO2 fixed by land plants returns to the atmosphere. Estimated at approximately 75 x 10(15) gC/yr, this large natural flux is likely to increase due changes in the Earth's condition. The objective of this paper is to provide a brief scientific review for policymakers who are concerned that changes in soil respiration may contribute to the rise in CO2 in Earth's atmosphere. Rising concentrations of CO2 in the atmosphere will increase the flux of CO2 from soils, while simultaneously leaving a greater store of carbon in the soil. Traditional tillage cultivation and rising temperature increase the flux of CO2 from soils without increasing the stock of soil organic matter. Increasing deposition of nitrogen from the atmosphere may lead to the sequestration of carbon in vegetation and soils. The response of the land biosphere to simultaneous changes in all of these factors is unknown, but a large increase in the soil carbon pool seems unlikely to moderate the rise in atmospheric CO2 during the next century.