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soil carbon pools of six ecological regions of the United States

Journal of Forestry Research 2020年第5期31卷 1933-1938页

作者： Amitava Chatterjee Department of soil Science North Dakota State UniversityFargoND 58108-6050USA

Mineralisable soil organic carbon(SOC)pools vary with ecosystem type in response to changes in climate,vegetation and soil *** the effect of climate and soil factors on SOC pools is critical for predicting change over *** soil samples from six ecoregions of the United States were analyzed for permanganate oxidizable C(KMnO4-C)and mineralizable C *** of SOC ranged from 7.9 mg g^-1(Florida site)to 325 mg g^-1(Hawaii site).Mineralisable C pools and KMnO4-C were highest in soils from the Hawaii *** annual precipitation explains SOC and resistant C pool *** content was related to mineralisable active C pools and bacterial *** annual precipitation and clay content are potential variables for predicting changes in SOC pools at large spatial scales.

关键词： Permanganate oxidizable carbon(KMnO4-C) Resistant carbon pool Mean residence time soil carbon pools United States

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Dynamics of soil Organic carbon Under Uncertain Climate Change and Elevated Atmospheric CO_2

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Pedosphere 2012年第4期22卷 489-496页

作者： LIN Zhong-Bing ZHANG Ren-Duo Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275(China)

Climate change and elevated atmospheric CO2 should affect the dynamics of soil organic carbon （SOC）. SOC dynamics under uncertain patterns of climate warming and elevated atmospheric CO2 as well as with different soil erosion extents at Nelson Farm during 1998-100 were simulated using stochastic modelling. Results based on numerous simulations showed that SOC decreased with elevated atmospheric temperature but increased with atmospheric CO2 concentration. Therefore, there was a counteract effect on SOC dynamics between climate warming and elevated CO2. For different soil erosion extents, warming 1℃ and elevated atmospheric CO2 resulted in SOC increase at least 15%, while warming 5 ℃ and elevated CO2 resulted in SOC decrease more than 29%. SOC predictions with uncertainty assessment were conducted for different scenarios of soil erosion, climate change, and elevated CO2. Statistically, SOC decreased linearly with the probability. SOC also decreased with time and the degree of soil erosion. For example, in 2100 with a probability of 50%, SOC was 1 617, 1 167, and 892 g m^-2, respectively, for no, minimum, and maximum soil erosion. Under climate warming 5 ℃ and elevated CO2, the soil carbon pools became a carbon source to the atmosphere （P 〉 95%）. The results suggested that stochastic modelling could be a useful tool to predict future SOC dynamics under uncertain climate change and elevated CO2.

关键词： atmospheric carbon dioxide climate warming soil carbon pools soil erosion stochastic modelling

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