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 : 2024-04-09 DOI:10.5194/egusphere-2024-419

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

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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-day 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 (IF_CO2) and various environmental and soil properties revealed significant positive correlations between IF_CO2 and soil organometal 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 IF_CO2 (p < 0.05). The covariations among Alp, total C, and Cp to Alp molar ratios and qCO₂_soc suggested Alp as the primary predictor of IF_CO2. Whereas soil microbial biomass C and nitrogen (N) levels were significantly lower in DWCs than under continuous constant moisture conditions, there was no significant relation between the microbial biomass decrease and IF_CO2. 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.

查看原文本刊更多论文

日本森林和牧场土壤在干燥-润湿循环过程中二氧化碳释放量的全面增加以及对增加幅度预测的探索

摘要。由于很少有研究使用相当于干燥-润湿循环过程中平均含水量的恒定湿度条件，因此仍然很难精确量化和预测干燥-润湿循环对土壤二氧化碳（CO2）释放的影响。本研究旨在评估 DWCs 对二氧化碳释放影响的总体趋势，并探索在 10 个日本森林和牧场土壤中影响大小变化的环境和土壤预测因素，这些土壤在成土过程中受到火山灰的不同影响。在包括三种 DWC 的 84 天培育期中，二氧化碳释放量是连续恒湿条件下的 1.3 到 3.7 倍（p < 0.05），平均含水量与 DWC 培育期相同。分析 DWCs 二氧化碳释放量的增加（IFCO2）与各种环境和土壤特性之间的关系发现，IFCO2 与土壤有机金属复合物含量（p < 0.05），尤其是焦磷酸可提取铝（Alp）含量（r = 0.74）之间存在显著的正相关关系。土壤总碳（C）和焦磷酸可提取 C（Cp）与 Alp 含量的摩尔比以及连续恒湿条件下土壤碳含量的二氧化碳释放率（qCO2_soc）也与 IFCO2 相关（p < 0.05）。Alp、总碳、Cp 与 Alp 的摩尔比以及 qCO2_soc 之间的协变关系表明，Alp 是预测 IFCO2 的主要因素。虽然 DWCs 中土壤微生物生物量 C 和氮（N）水平显著低于连续恒湿条件下，但微生物生物量的减少与 IFCO2 之间没有显著关系。本研究表明，在日本的森林和牧场土壤中，DWC 会全面增加土壤二氧化碳的释放量，这表明 Alp 是效应大小的预测因子，这可能是由于有机-Al 复合物易受 DWC 影响所致。

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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.).