Biogeochemical and hydrological controls on carbon export from a forested catchment in central Japan

Kawasaki, Masatoshi; Ohte, Nobuhito; Katsuyama, Masanori

doi:10.1007/4-431-29361-2_11

Cited by 10 publications

(18 citation statements)

References 36 publications

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“…Dissolved organic matter generally includes a small proportion of low-molecular-weight compounds such as carbohydrates and amino acids and a larger proportion of complex, high-molecular-weight compounds (Evans et al, 2005;Kawasaki et al, 2005). Dissolved organic matter is often quantified by its carbon content and referred to as DOC and nearly all DOC in soils comes from photosynthesis (Bolan et al, 2011).…”

Section: Soil Carbon Leaching To Groundwatermentioning

confidence: 99%

“…However, a large fraction of DOC in soil solution is sorbed onto minerals and, before being exported to streams, DOC must be mobilized from the soil (Sanderman and Amundson, 2009). Surface precipitation has been described as an important process that transports DOC downward from the topsoil to the saturated zone (Kawasaki et al, 2005;Shen et al, 2015). The transfer of DOC in groundwater also depends on the level of hydraulic connectivity between subsoil horizons and water table depth (Kalbitz et al, 2000).…”

Section: Soil Carbon Leaching To Groundwatermentioning

confidence: 99%

“…The carbon dynamics in forest stream ecosystems results from the interaction among biological activity, weathering, water infiltration, drainage and retention-mobilization mechanisms in soils (Jones and Mulholland, 1998;Kawasaki et al, 2005;Shibata et al, 2001). Indeed, biogeochemical cycling within and across the terrestrial-aquatic interface is dynamically linked to the water cycle (Battin et al, 2009;Johnson et al, 2006) because dissolved carbon is primarily mobilized and transported by the movement of water (Hagerdon et al, 2000;Hope et al, 1994;Kawasaki et al, 2005). Furthermore, numerous works in different environments came to the same conclusion that streams and small rivers are hotspots of CO 2 degassing (Butman and Raymond, 2011;Johnson et al, 2008;Kokic et al, 2015;Polsenaere and Abril, 2012;Wallin et al, 2013).…”

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confidence: 99%

“…Some authors reported high concentrations of dissolved inorganic carbon (DIC) (Kawasaki et al, 2005;Venkiteswaran et al, 2014) and dissolved organic carbon (DOC) (Artinger et al, 2000;Baker et al, 2000) in forestdominated groundwater (i.e., in the saturated zone of the soil). However, estimations of terrestrial carbon leaching from direct simultaneous measurements in groundwater and streams are scarce.…”

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confidence: 99%

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Hydro-ecological controls on dissolved carbon dynamics in groundwater and export to streams in a temperate pine forest

et al. 2018

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Abstract. We studied the export of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) from forested shallow groundwater to first-order streams, based on groundwater and surface water sampling and hydrological data. The selected watershed was particularly convenient for such study, with a very low slope, with pine forest growing on sandy permeable podzol and with hydrology occurring exclusively through drainage of shallow groundwater (no surface runoff). A forest plot was instrumented for continuous eddy covariance measurements of precipitation, evapotranspiration, and net ecosystem exchanges of sensible and latent heat fluxes as well as CO 2 fluxes. Shallow groundwater was sampled with three piezometers located in different plots, and surface waters were sampled in six first-order streams; river discharge and drainage were modeled based on four gauging stations. On a monthly basis and on the plot scale, we found a good consistency between precipitation on the one hand and the sum of evapotranspiration, shallow groundwater storage and drainage on the other hand. DOC and DIC stocks in groundwater and exports to first-order streams varied drastically during the hydrological cycle, in relation with water table depth and amplitude. In the groundwater, DOC concentrations were maximal in winter when the water table reached the superficial organic-rich layer of the soil. In contrast, DIC (in majority excess CO 2 ) in groundwater showed maximum concentrations at low water table during late summer, concomitant with heterotrophic conditions of the forest plot. Our data also suggest that a large part of the DOC mobilized at high water table was mineralized to DIC during the following months within the groundwater itself. In firstorder streams, DOC and DIC followed an opposed seasonal trend similar to groundwater but with lower concentrations. On an annual basis, leaching of carbon to streams occurred as DIC and DOC in similar proportion, but DOC export occurred in majority during short periods of the highest water table, whereas DIC export was more constant throughout the year. Leaching of forest carbon to first-order streams represented a small portion (approximately 2 %) of the net land CO 2 sink at the plot. In addition, approximately 75 % of the DIC exported from groundwater was not found in streams, as it returned very fast to the atmosphere through CO 2 degassing.

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Section: Soil Carbon Leaching To Groundwatermentioning

confidence: 99%

Section: Soil Carbon Leaching To Groundwatermentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Hydro-ecological controls on dissolved carbon dynamics in groundwater and export to streams in a temperate pine forest

et al. 2018

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“…2). (Kawasaki et al, 2005;Kim et al, 2010), 식(10)은 K t 의 형태로써, 시간에 대한 지수적 함수관계를 가진다 (Kohler and Linsley, 1951;Brooca et al, 2005). 연속적으로 측정된 토양저류변화와 비 교하기 위해, 시간에 대해 확장된 식으로 식(7)～ (10) 으로 표현된다.…”

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Soil Water Storage and Antecedent Precipitation Index at Gwangneung Humid-Forested Hillslope

Gwak¹,

Kim²,

Lee³

et al. 2016

Korean Journal of Agricultural and Forest Meteorology

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The temporal variation of soil water storage is important in hydrological modeling. In order to evaluate an antecedent wetness state, the antecedent precipitation index (API) has been used. The aim of this article is to compare observed soil water storage with APIs calculated by widely used four equations, to configure the relationship between soil water storage and API by a regression model for one-year(2009), and to predict the soil water storage for the next two years(2010～2011). The soil water storage was evaluated from the observed soil moisture dataset in soil depths of 10, 30, 60cm at 21 locations by TDR measurement system for 3 years. As a result, API with the exponential function among the four equations can describe the variation of the observed soil water storage. Monthly optimized parameters of the API's equations seemed to be roughly related with the (potential) evapotranspiration (PET). Using revised monthly optimized parameters of APIs considering the seasonal pattern of PET, we characterize the relationship between API and the observed soil water storage for one year, which looks better than those of other researches.

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Agents of change and temporal nutrient dynamics in the Altamaha River Watershed

et al. 2017

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Abstract. Nutrient and carbon dynamics in river ecosystems are shifting, and climate change is likely a driving factor; however, some previous studies indicate anthropogenic modification of natural resources may supersede the effects of climate. To understand temporal changes in river ecosystems, consideration of how these agents act independently and collectively to affect watershed biogeochemistry is necessary. Through the Georgia Coastal Ecosystems Long-Term Ecological Research Project, we assessed nutrient (phosphorus, nitrogen, silicate) and carbon dynamics, with specific regard to import and export, in the Altamaha River Basin from 2000 to 2012. This is the first study in the region to document the biogeochemical patterns in the Altamaha's four main tributaries, the Little Ocmulgee, Ocmulgee, Oconee, and Ohoopee rivers, and the relationships between biogeochemistry and historical precipitation and discharge patterns as well as agricultural and population census data. As discharge patterns are a primary driver of nutrient loads, we determined that water use was a dominant factor in the shifting ecosystem dynamics. Dissolved inorganic nitrogen loads were primarily driven by population density and dissolved inorganic phosphorus loads were strongly influenced by livestock biomass. Taken together, we conclude that both the transportation and biogeochemical cycling of nutrients within the Altamaha River Watershed were highly impacted by anthropogenic influences, which were then further exacerbated by continued climate change. Furthermore, the N-and P-loads in the Altamaha River and tributaries were dominated by dissolved organic nitrogen and dissolved organic phosphorus, emphasizing a need to further study the bioavailability of these species and the mechanisms driving their potential ecological impacts.

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Biogeochemical and hydrological controls on carbon export from a forested catchment in central Japan

Cited by 10 publications

References 36 publications

Hydro-ecological controls on dissolved carbon dynamics in groundwater and export to streams in a temperate pine forest

Hydro-ecological controls on dissolved carbon dynamics in groundwater and export to streams in a temperate pine forest

Soil Water Storage and Antecedent Precipitation Index at Gwangneung Humid-Forested Hillslope

Agents of change and temporal nutrient dynamics in the Altamaha River Watershed

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