Comprehensive increase in CO2 release by drying–rewetting cycles among Japanese forests and pastureland soils and exploring predictors of increasing magnitude

IF 5.8 2区农林科学 Q1 SOIL SCIENCE

Soil Pub Date : 2025-01-16 DOI:10.5194/soil-11-35-2025

Yuri Suzuki, Syuntaro Hiradate, Jun Koarashi, Mariko Atarashi-Andoh, Takumi Yomogida, Yuki Kanda, Hirohiko Nagano

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引用次数: 0

Abstract

Abstract. It is still difficult to precisely quantify and predict the effects of drying–rewetting cycles (DWCs) on soil carbon dioxide (CO2) release due to the paucity of studies using constant moisture conditions equivalent to the mean water content during DWC incubation. The present study was performed to evaluate overall trends in the effects of DWCs on CO2 release and to explore environmental and soil predictors for variations in the effect size in 10 Japanese forests and pastureland soils variously affected by volcanic ash during their pedogenesis. Over an 84 d incubation period including three DWCs, CO2 release was 1.3- to 3.7-fold greater than under continuous constant moisture conditions (p<0.05) with the same mean water content as in the DWC incubations. Analysis of the relations between this increasing magnitude of CO2 release by DWCs (IFCO2) and various environmental and soil properties revealed significant positive correlations between IFCO2 and soil organo-metal complex contents (p<0.05), especially pyrophosphate-extractable aluminum (Alp) content (r=0.74). Molar ratios of soil total carbon (C) and pyrophosphate-extractable C (Cp) to Alp contents and soil-carbon-content-specific CO2 release rate under continuous constant moisture conditions (qCO2_soc) were also correlated with IFCO2 (p<0.05). The covariations among Alp, total Cp/Alp, and Cp/Alp molar ratios and qCO2_soc suggested Alp to be the primary predictor of IFCO2. Additionally, soil microbial biomass C and nitrogen (N) levels were significantly lower in DWCs than under continuous constant moisture conditions, whereas there was no significant relation between the microbial biomass decrease and IFCO2. The present study showed a comprehensive increase in soil CO2 release by DWC in Japanese forests and pastureland soils, suggesting that Alp is a predictor of the effect size, likely due to vulnerability of organo-Al complexes to DWC.

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日本森林和牧场土壤干-复湿循环中CO2释放的综合增加及其增加幅度的预测因子的探索

摘要。由于缺乏在干燥-再湿循环（DWCs）培养期间使用相当于平均含水量的恒定水分条件的研究，因此仍然难以精确量化和预测干燥-再湿循环（DWCs）对土壤二氧化碳（CO2）释放的影响。本研究旨在评估DWCs对CO2释放影响的总体趋势，并探索10个日本森林和牧场土壤在其成土过程中受到火山灰不同影响的影响大小变化的环境和土壤预测因子。在84 d的孵育期（包括3个DWC）中，二氧化碳释放量是连续恒定湿度条件下的1.3- 3.7倍（p<0.05），平均含水量与DWC孵育相同。分析DWCs CO2释放的增加幅度与各种环境和土壤性质之间的关系，发现IFCO2与土壤有机金属络合物含量呈显著正相关（p<0.05），特别是焦磷酸盐可提取铝（Alp）含量（r=0.74）。连续恒湿条件下土壤总碳(C)和焦磷酸盐可萃取碳（Cp）与Alp含量的摩尔比以及土壤碳含量特定CO2释放速率（qCO2_soc）也与IFCO2相关（p<0.05）。Alp、总Cp/Alp、Cp/Alp摩尔比和qCO2_soc之间的协变表明Alp是IFCO2的主要预测因子。土壤微生物生物量C和氮(N)水平显著低于连续恒定水分条件下，而微生物生物量减少与IFCO2之间无显著关系。本研究显示，日本森林和牧场土壤中DWC对土壤CO2释放的全面增加，表明Alp是效应大小的预测因子，可能是由于有机铝复合物对DWC的脆弱性。

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来源期刊

Soil Agricultural and Biological Sciences-Soil Science

CiteScore

10.80

自引率

2.90%

发文量

审稿时长

30 weeks

期刊介绍： SOIL is an international scientific journal dedicated to the publication and discussion of high-quality research in the field of soil system sciences. SOIL is at the interface between the atmosphere, lithosphere, hydrosphere, and biosphere. SOIL publishes scientific research that contributes to understanding the soil system and its interaction with humans and the entire Earth system. The scope of the journal includes all topics that fall within the study of soil science as a discipline, with an emphasis on studies that integrate soil science with other sciences (hydrology, agronomy, socio-economics, health sciences, atmospheric sciences, etc.).