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Sustainability 2017, 9(7), 1129; doi:10.3390/su9071129

Simulation on the Future Change of Soil Organic Carbon from Phaeozems under Different Management Practices in Northeast China

1
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
2
Institute of Environment and Sustainable Development in Agriculture, China Academy of Agricultural Science, Beijing 100081, China
3
College of Forestry, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
4
College of Economics and Management, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
5
College of Agronomy, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
6
Institute of Agricultural Resources and Regional Planning, China Academy of Agricultural Science, Beijing 100081, China
These authors contributed equally to this paper.
*
Author to whom correspondence should be addressed.
Received: 28 March 2017 / Revised: 1 June 2017 / Accepted: 19 June 2017 / Published: 28 June 2017
(This article belongs to the Special Issue Soil Science in Conservation Agricultural Systems)
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Abstract

The Phaeozem region is an important grain production base in China and soil fertility has declined under long-term cultivation. Studying soil organic carbon (SOC) change in the upland phaeozem of Northeast China under different tillage modes has great theoretical and practical significance for reducing greenhouse gases emissions, increasing soil carbon stocks, and ensuring food security. This study applied the DAYCENT model to simulate six long-term experimental sites in the phaeozem region, and through calibration and validation analysis, it concluded that the DAYCENT model could effectively simulate the dynamic change of SOC in the upland phaeozems; hence, the relevant parameters of each site were determined. Under future climate scenarios (Representative Concentration Pathway 4.5, RCP 4.5), SOC change in agricultural soils (0–20 cm topsoil) of four different management scenarios (fertilizer application, manure amendment, straw return, no-tillage) was simulated. The overall simulated trend was no-tillage > straw return > manure amendment > fertilizer application. Fertilizer had no evident effect on increasing SOC, but the effect would be better if combined with manure; both straw return and no-tillage had the general effect of improving SOC and the simulated values rose rapidly with a large increasing rate within a short period; however, the increasing rate became gentle after 2050, reached a relatively stable level after 2080, then gradually reached carbon saturation. Untill 2100, the SOC content of each site reached a relatively higher level by adopting the no-tillage treatment, where the SOC contents of Harbin, Hailun, Nehe, Dehui, Gongzhuling and Lishu were 2.36 g/100 g, 2.81 g/100 g, 2.22 g/100 g, 2.38 g/100 g, 1.97 g/100 g and 2.01 g/100 g, respectively. The SOC contents increased by 52.47% when compared with the initial value, and the simulated average annual increase of SOC for 84 years was 0.0082 g/100 g. View Full-Text
Keywords: soil organic carbon (SOC); climate scenario RCP4.5; phaeozem; no-tillage soil organic carbon (SOC); climate scenario RCP4.5; phaeozem; no-tillage
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Zhang, M.; Zhang, J.; Liu, M.; Guo, L.; Ma, F.; Xie, L.; Xu, M.; Yun, A. Simulation on the Future Change of Soil Organic Carbon from Phaeozems under Different Management Practices in Northeast China. Sustainability 2017, 9, 1129.

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