Modeling impacts of carbon sequestration on net greenhouse gas emissions from agricultural soils in China

文献类型： 外文期刊

第一作者： Qiu, Jianjun

作者： Qiu, Jianjun;Wang, Ligang;Tang, Huajun;Li, Hu;Li, Changsheng;Van Ranst, Eric

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期刊名称：GLOBAL BIOGEOCHEMICAL CYCLES （ 影响因子：5.703； 五年影响因子：6.374 ）

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收录情况： SCI

摘要： Soil organic carbon (SOC) contents in many farmlands have been depleted because of the long-term history of intensive cultivation in China. Chinese farmers are encouraged to adopt alternative management practices on their farms to sequester SOC. On the basis of the availability of carbon (C) resources in the rural areas in China, the most promising practices are (1) incorporating more crop residue in the soils and (2) resuming traditional manure fertilizer. By implementing the alternative practices, increase in SOC content has been observed in some fields. This paper investigates how the C sequestration strategies could affect nitrous oxide (N_2O) and methane (CH_4) emissions from the agricultural soils in six selected sites across China. A process-based model, denitrification-decomposition or DNDC, which has been widely validated against data sets of SOC dynamics and N_2O and CH4 fluxes observed in China, was adopted in the study to quantify the greenhouse gas impacts of enhanced crop residue incorporation and manure amendment under the diverse climate, soil, and crop rotation conditions across the six agroecosystems. Model results indicated that (1) when the alternative management practices were employed C sequestration rates increased, however, N_2O or CH_4 emissions were also increased for these practices; and (2) reducing the application rates of synthetic fertilizer in conjunction with the alternative practices could decrease N_2O emissions while at the same time maintaining existing crop yields and C sequestration rates. The modeling approach could help with development of spatially differentiated best management practices at large regional scales.

分类号： 565B0108

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