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The effect of organic matter application on carbon sequestration and soil fertility in upland fields of different types of Andosols

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Title: The effect of organic matter application on carbon sequestration and soil fertility in upland fields of different types of Andosols
Authors: Iwasaki, Shinya Browse this author
Endo, Yasuhiko Browse this author
Hatano, Ryusuke Browse this author →KAKEN DB
Keywords: Andosol
organic matter application
physico-chemical properties
soil organic carbon
Issue Date: Jun-2017
Publisher: Taylor & Francis
Journal Title: Soil science and plant nutrition
Volume: 63
Issue: 2
Start Page: 200
End Page: 220
Publisher DOI: 10.1080/00380768.2017.1309255
Abstract: We evaluated the effect of long-term application of organic matter on soil organic carbon (SOC), and physico-chemical properties of different types of Andosols in the cool temperate zone. In 2012, a soil survey was conducted in 34 fields in Toya, Hokkaido, Japan, using reference data collected from 2001 to 2003 in the same fields. The region contains three groups of soil series (K1, K2 and HO), with soils of K1 (Vitric Andosols) being strongly affected by newly (1769-2000) erupted volcanic ash compared with K2 and HO (Silandic Andosols). The mean application rate of organic matter was 1.45 +/- 1.27Mg carbon (C) ha(-1) yr(-1). Mean SOC contents in 2001-2003 and 2012 were 26.5 +/- 8.1 and 25.7 +/- 5.7gC kg(-1), respectively, and mean SOC stocks were 39.6 +/- 10.2 and 37.9 +/- 7.4Mg C ha(-1) 0.15m(-1), respectively. There were no significant differences in either SOC content or stock. However, the rate of change in SOC between 2001-2003 and 2012 (SOC) was significantly higher in K1 than in K2, and SOC decreased significantly in K2. There was a significant negative correlation between initial SOC and rate of SOC: rate of SOC content (gC kg(-1) yr(-1))=-0.046 x Initial SOC content (gC kg(-1)) + 1.12 and rate of SOC stock (Mg C ha(-1) 0.15m(-1) yr(-1))=-0.052 x Initial SOC stock (Mg C ha(-1) 0.15m(-1)) + 2.09. The thresholds of initial SOC content and stock (intercept at the x-axis) were calculated as 24.3gC kg(-1) and 36.1Mg C ha(-1) 0.15m(-1), respectively. These values were higher than those obtained in previous studies conducted in croplands probably because of the specific features of Andosols. SOC content was significantly negatively correlated with bulk density, available phosporus and base saturation, but positively correlated with total porosity, phosphate absorption coefficient and cation exchange capacity. These findings indicate that application of organic matter increases SOC and improves soil fertility when the initial SOC is lower than the threshold, and highlight the difficulties in maintaining or accumulating SOC in Andosols because of the high SOC.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Soil Science and Plant Nutrition on June 2017, available online: http://www.tandfonline.com/10.1080/00380768.2017.1309255
Type: article (author version)
URI: http://hdl.handle.net/2115/70656
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 波多野 隆介

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