Functional soil organic matter fractions in response to long-term fertilization in upland and paddy systems in South China

Show simple item record Yang, Fan Tian, Jing Meersmans, Jeroen Fang, Huajun Yang, Hao Lou, Yilai Li, Zhongfang Liu, Kailou Zhou, Yi Blagodatskaya, Evgenia Kuzyakov, Yakov 2018-01-03T12:39:56Z 2018-01-03T12:39:56Z 2017-11-04T12:39:56Z
dc.identifier.citation Fan Yang, Jing Tian, Jeroen Meersmans,, Functional soil organic matter fractions in response to long-term fertilization in upland and paddy systems in South China. CATENA, Volume 162, 2018, Pages 270-277 en_UK
dc.identifier.issn 0341-8162
dc.description.abstract Soil organic matter (SOM) and its fractions play key roles in optimizing crop yield and improving soil quality. However, how functional SOM fractions responded to long-term fertilization and their relative importance for C sequestration were less addressed. In this study, we determined the effects of long-term fertilization on six functional SOM fractions (unprotected, physically protected, physico-biochemically protected, physico-chemically protected, chemically protected, and biochemically protected) based on two long-term fertilization experiments carried out in South China. The unprotected coarse particulate organic matter (cPOM), the biochemically and chemically protected silt-sized fractions (NH-dSilt and H-dSilt) were the primary C storage fractions under long-term fertilization, accounting for 23.6–46.2%, 15.7–19.4%, and 14.4–17.4% of the total soil organic carbon (SOC) content in upland soil and 19.5–29.3%, 9.9–15.5%, and 14.2–17.2% of the total SOC content in paddy soil, respectively. Compared with the control treatment (CK) in upland soil, the application of manure combined with mineral NPK (NPKM) resulted in an increase in the SOC content in the cPOM, pure physically protected fraction (iPOM), the physico-chemically protected (H-μSilt), and the chemically protected (H-dSilt) fraction by 233%, 166%, 124%, and 58%, respectively. Besides, the SOC increase in upland soil expressed as SOC content per unit of total SOC for iPOM, H-μSilt, cPOM and H-dSilt were the highest and as large as 283%, 248%, 194%, and 105% respectively. In paddy soil, the highest increase per unit of total SOC was H-dSilt (190%), followed by H-dClay (156%) and H-μSilt (155%). These results suggested that the upland soil could stabilize more C through the pure physical, whereas the chemical protection mechanism played a more important role in paddy soil. Chemical protection mechanism within the microaggregates played important roles in sequestrating C in both upland and paddy soils. Overall, the different responses of functional SOM fractions to long-term fertilization indicate different mechanisms for SOM cycling in terms of C sequestration under upland and paddy systems. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri *
dc.subject Long-term fertilization en_UK
dc.subject Soil organic matter fraction en_UK
dc.subject Physical and chemical fractionation en_UK
dc.subject Protection mechanism en_UK
dc.title Functional soil organic matter fractions in response to long-term fertilization in upland and paddy systems in South China en_UK
dc.type Article en_UK

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