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plantationAbe, Yukiko*; Liang, N.*; Teramoto, Munemasa*; Koarashi, Jun; Atarashi-Andoh, Mariko; Hashimoto, Shoji*; Tange, Takeshi*
Geoderma Regional (Internet), 29, p.e00529_1 - e00529_11, 2022/06
Times Cited Count：1 Percentile：14.82(Soil Science)This study aimed to clarify the causes of spatial variation in soil respiration rate on volcanic ash soil. From January 2013 to August 2019, soil respiration rates were measured at 40 measuring points periodically at a 35-year-old plantation in Tokyo, Japan. In August 2019, the carbon content of the litter layer, total carbon content of soil organic matter (SOM), carbon content of the low-density fraction (LF-C) of SOM, fine root biomass, and bulk density of soil were measured at all measuring points. Results of the multiple regression analysis showed that the model with only the LF-C as an explanatory variable had the highest capability for predicting the respiration rate at a soil temperature of 20
C, indicating that LF-C, which is considered to be readily available to soil microorganisms, can be the main factor responsible for the spatial variation in soil respiration rate.
Abe, Yukiko*; Liang, N.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Teramoto, Munemasa*; Hashimoto, Shoji*; Tange, Takeshi*
no journal, ,
We measured soil respiration rates (SR) at 21 points in a Cryptomeria japonica plantation of Tokyo University of Agriculture Okutama Forest, from January 2013 to August 2019, and examined temporal changes and factors of spatial variation. The observation showed that the measured points with higher SR in 2013 tended to have higher SR throughout the seven years. There was not significant correlation between the amount of organic carbon in the surface soil and SR. However, the amount of light fraction (
1.6 g cm
) of soil or fine root biomass in the surface soil had a significant positive correlation with SR. Since the light fraction of soil contains organic matter that is easily decomposed by microbes, the variation of the easily decomposable organic matter content was considered to be the cause of the spatial variation in SR.
plantationAbe, Yukiko; Liang, N.*; Teramoto, Munemasa*; Koarashi, Jun; Atarashi-Andoh, Mariko; Hashimoto, Shoji*; Tange, Takeshi*
no journal, ,
no abstracts in English
Abe, Yukiko; Nakayama, Masataka; Tange, Takeshi*; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
Soil is the largest carbon pool in terrestrial ecosystems, and forest soils in particular play an important role as a C reservoir in the global C cycle. Organic matter in the soil is released to the atmosphere as carbon dioxide through microbial decomposition (heterotrophic respiration). Decomposition of organic matter accumulated in the subsoil may contribute significantly to heterotrophic respiration, but it is not clear. Therefore, the objective of this study was to determine the heterotrophic respiration rate from the surface to the lower layers of forest soils with different parent materials. This presentation will report on the relationship between soil physicochemical and organic matter properties and heterotrophic respiration.
release increase under dry-wet cyclesSuzuki, Yuri*; Nagano, Hirohiko*; Hiradate, Shuntaro*; Atarashi-Andoh, Mariko; Abe, Yukiko; Koarashi, Jun; Nakayama, Masataka
no journal, ,
Suzuki, Yuri*; Nagano, Hirohiko*; Hiradate, Shuntaro*; Atarashi-Andoh, Mariko; Abe, Yukiko; Nakayama, Masataka; Koarashi, Jun
no journal, ,
no abstracts in English
Nakayama, Masataka; Abe, Yukiko; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
Plants take up nitrogen mainly from surface soil, while under the nutrient competition, they utilize nitrogen from subsurface soil layers. However, nitrogen dynamics in the subsoil layer is unclear. Here, we investigated the soil profiles (0-60 cm depth) of net nitrogen mineralization and nitrification rates at four Japanese broad-leave forest having two different soil types (volcanic ash and non-volcanic ash soil). The results showed that net nitrogen mineralization decreased with increase of soil depth in the sites of volcanic ash soil, but the trend was not observed in the sites of non-volcanic ash soil. When the rates represented per unit soil volume, the vertical differences in nitrogen mineralization were non-significant for these two soil types. Similar to the factors regulating the spatial variations of nitrogen dynamics, the vertical trends were regulated by the soil total carbon and nitrogen contents and microbial biomass. These results suggested that the quantities of soil organic material and microbes regulated both of the horizontal and vertical differences in the nitrogen dynamics, and that the subsurface soil, as well as surface soil, was quantitatively important nitrogen source for plants.
Abe, Yukiko; Nakayama, Masataka; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
Subsoils contain more than half of the global soil carbon. Decomposition of organic matter accumulated in the subsoil is thought to contribute significantly to heterotrophic respiration, and the supply of new organic matter to the subsoil may accelerate the decomposition of soil organic matter (priming effect). However, the carbon dynamics in the subsoil are unknown. The aim of this study was to evaluate the decomposition response to a new supply of organic matter, focusing on the differences in the interaction between organic matter and minerals in the presence and absence of volcanic ash. The surface and subsoil layers of four study sites with volcanic and non-volcanic ash soils were prepared to 64% of water holding capacity (WHC) and incubated at 20C and 30C after addition of 1% of WHC or a sucrose solution labeled at 
C. Sucrose addition had a positive priming effect in the lower layers of the volcanic ash soils, but the difference in carbon release after 90 days of incubation was about half of the addition in all soils, with and without sucrose addition. Therefore, sucrose addition to the soil enhanced organic matter decomposition, but it was suggested that some of the sucrose may remain in the soil.
