Black humic acid dynamics during natural reforestation of Japanese pampas grass (Miscanthus sinensis)

Iimura, Yasuo; Fujimoto, Mari; Tamura, Kenji; Higashi, Teruo; Kondo, Miyuki; Uchida, Masao; Yonebayashi, Koyo; Fujitake, Nobuhide

doi:10.1016/j.soilbio.2012.07.011

Cited by 5 publications

(2 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conversely, when carbon availability is limited, substrate availability determines Q 10 . The black SOC used in this study is known to be of very low quality with high aromaticity compared to other SOM types [29,32], suggesting that increased carbon availability due to glucose addition in SC and SCN resulted in higher Q 10 values compared to those for S and SN. This is further supported by the strong positive correlation between E a and Q 10 (Figure 5b).…”

Section: Temperature Sensitivitymentioning

confidence: 96%

“…Volcanic ash soil is a major type of soil in Japan, characterized by very thick, darkcolored A horizons with a large amount of organo-mineral complexes of dark-colored organic matter associated with short-range order minerals (particularly allophane and imogolite) and/or monomeric Al and Fe ions (i.e., active Al and Fe) [32,33]. Although this dark-colored SOC is hypothesized to be very stable, the temperature sensitivity of SOC turnover and the PE in this Japanese black soil remain highly uncertain, especially in buried black layers [34,35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of the Co-Application of Glucose, Nitrogen, and Elevated Temperature on Buried Black Soil Carbon in a Cool Temperate Deciduous Broad-Leaved Forest

Iimura,

Tanaka

2024

Forests

View full text Add to dashboard Cite

Accurately predicting the feedback mechanisms between forest ecosystem carbon cycling and climate change is crucial for effective climate mitigation. Understanding soil organic carbon (SOC) responses to the combined impacts of plant biomass, litter, and nitrogen deposition, especially regarding temperature sensitivity, is essential but remains poorly understood. We conducted incubation experiments using buried black soil from a cool temperate deciduous broad-leaved forest in Japan, which has high C content and a highly stable molecular structure. The stepwise addition of glucose and a temperature increase from 15 to 35 °C accelerated SOC mineralization by 74.0 mg C kg−1 with a positive priming effect (PE) during the 49-day incubation period, while the simultaneous addition of nitrogen had no significant effect on this phenomenon, with SOC mineralization measured at 75.5 mg C kg−1. Conversely, glucose mineralization was significantly accelerated by 10%, from 241.0 to 261.3 mg C kg−1, by stepwise nitrogen addition and temperature increase. Under the combined impacts, the Q10 value of the soil increased significantly from 1.6 to 2.0 compared to that in the unmodified conditions, primarily due to the stepwise addition of glucose. We also found a strong positive correlation between activation energy (Ea) and Q10. This result strongly supports the carbon quality–temperature (CQT) hypothesis. These results likely stem from interactions between SOC quality and carbon availability, suggesting that, in the future, climate change is likely to have a positive feedback effect, especially on buried black soils.

show abstract

Section: Temperature Sensitivitymentioning

confidence: 96%