In:
Ecosystem Health and Sustainability, American Association for the Advancement of Science (AAAS), Vol. 3, No. 7 ( 2017-07-03)
Kurzfassung:
Introduction: To generate information for the effective management of soil organic carbon (SOC) sequestration in Chinese croplands, we compared the additional organic carbon (C) that can be stabilized by fine soil particles ( 〈 20 μm) with typical fertilization practices across soil types and climate zones. Using data from 30 long-term experimental study sites across the major agricultural zones in China, we estimated stable SOC saturation deficit (SOC deficit ) under no fertilization (CK), chemical fertilization (CF), straw plus CF (S + CF), and manure plus CF (M + CF). Stable SOC deficit was defined as the difference between potential and current SOC stabilized by fine soil particles. Outcomes: Stable SOC deficit values varied from 51% to 82%. Soils dominated by 2:1 clay minerals showed larger stable SOC deficit than soils dominated by 1:1 clay minerals under each treatment. For soils dominated by 2:1 clay minerals, stable SOC deficit was significantly lower under M + CF (69%) than under CK, CF, and S + CF (78–82%) treatments, and it increased with increasing mean annual temperature ( 〈 10°C). In soils dominated by 1:1 clay minerals, stable SOC deficit was considerably lower in paddy and paddy-upland than in upland soils, suggesting that paddies effectively stabilize C inputs. Discussion: Agricultural soils in China have considerable C sequestration potential, despite decades of fertilization practices. To manage soil C sequestration and model soil C dynamics effectively, factors such as soil mineral types, fertilization, and cropland use should be considered. Conclusion: Our results demonstrated that manure addition was the best fertilization method for improving soil fertility, whereas straw return in Chinese croplands should take into account climate mitigation in future.
Materialart:
Online-Ressource
ISSN:
2096-4129
,
2332-8878
DOI:
10.1080/20964129.2017.1364047
Sprache:
Englisch
Verlag:
American Association for the Advancement of Science (AAAS)
Publikationsdatum:
2017
ZDB Id:
2815489-7
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