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Title: Forest understories controlled the soil organic carbon stock during the fallow period in African tropical forest: a 13C analysis
Authors: Sugihara, Soh
Shibata, Makoto
Mvondo Ze, Antoine D.
Tanaka, Haruo
Kosaki, Takashi
Funakawa, Shinya
Author's alias: 杉原, 創
柴田, 誠
田中, 治夫
小﨑, 隆
舟川, 晋也
Keywords: Agroecology
Carbon cycle
Issue Date: 8-Jul-2019
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 9
Thesis number: 9835
Abstract: Soil organic carbon (SOC) dynamics after slash-burn agriculture are poorly understood in African tropical forest, though recent studies have revealed C4 grass invasion as a forest understory influences SOC dynamics after deforestation. This study aimed to quantify the relative SOC contribution of C4 and C3 plants separately through the sequential fallow periods of forest (cropland, or 4–7, 20–30, or >50 years of fallow forest) in the tropical forest of eastern Cameroon. We evaluated the SOC stock and natural 13C abundance for each layer. The SOC stock was largest in 4–7 years fallow forest (136.6 ± 8.8 Mg C ha−1; 100 cm depth, and C4:C3 = 58:42), and decreased with increasing fallow period. SOC from C4 plants was larger in the 4–7 and 20–30 years fallow forests (57.2–60.4 ± 5.8 Mg C ha−1; 100 cm depth), while it clearly decreased in >50 years fallow forest (35.0 ± 4.1 Mg C ha−1; 100 cm depth), resulting in the smallest SOC in this mature forest (106.4 ± 12.9 Mg C ha−1; 100 cm depth). These findings indicate that C4 grass understories contributed to the SOC restoration during early fallow succession in the tropical forest of eastern Cameroon.
Description: アフリカ熱帯林の焼畑-休閑サイクルにおいて休閑初期の草本植生の侵入が土壌肥沃度の回復を早めることを発見. 京都大学プレスリリース. 2019-07-31.
Rights: © The Author(s) 2019 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
URI: http://hdl.handle.net/2433/243243
DOI(Published Version): 10.1038/s41598-019-46406-2
PubMed ID: 31285565
Related Link: http://www.kyoto-u.ac.jp/ja/research/research_results/2019/190708_1.html
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