Long-term soil carbon loss and accumulation in a catchment following the conversion of forest to arable land in northern Laos

Huon, Sylvain; Rouw, Anneke de; Bonté, Philippe; Robain, Henri; Valentin, Christian; Lefevre, Irène; Girardin, Cyril; Troquer, Yann Le; Podwojewski, Pascal; Sengtaheuanghoung, Oloth

doi:10.1016/j.agee.2013.02.007

Cited by 52 publications

(49 citation statements)

References 69 publications

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“…−15 ‰, that are explained by the input of organic matter derived from C 4 photosynthetic pathway plant tissues. The C 4 plants found in the catchment are mainly Napier grasses growing in the swamp and along some sections of the stream channel, and to a much lower extent, Job's tears and maize cultivated on nearby hillslopes (Huon et al, 2013). Soil surface and subsurface sources can also be distinguished by their δ 15 N values, which are slightly lower for the former (Table 1).…”

Section: Composition Of the Potential Sources Of Particulate Organic mentioning

confidence: 97%

“…The mean organic matter characteristics are reported in Table 1 for surface soils, gullies and stream banks collected in the catchment, together with 137 Cs activities determined on the same sample aliquots (Huon et al, 2013;Gourdin et al, 2014). High 137 Cs activities are measured in surface soil samples, whereas gully and riverbank sites are depleted in this radioisotope (Table 1).…”

Section: Composition Of the Potential Sources Of Particulate Organic mentioning

confidence: 99%

“…Surface soils * 25 ± 5 2.1 ± 0.5 11.6 ± 2.0 −25.5 ± 1.4 6.7 ± 1.3 2.2 ± 0.9 Stream banks * * 13 ± 6 1.1 ± 0.3 12.4 ± 7.7 −23.2 ± 4.4 8.6 ± 1.9 0.4 ± 0.3 Gullies * * 14 ± 7 1.4 ± 0.6 9.6 ± 0.8 −22.7 ± 0.8 8.7 ± 2.1 0.4 ± 0.3 * Data from Huon et al (2013) and this study (2012), * * this study (2012).…”

Section: Composition Of the Potential Sources Of Particulate Organic mentioning

confidence: 99%

“…The soils have low pH ranging between 4.4 and 5.5 (Chaplot et al, 2009) indicating that carbonate precipitation does not occur in soils and that they are therefore unlikely to supply particulate inorganic carbon to rivers. Native vegetation consisted of lowland forest dominated by bamboos that were first cleared to implement shifting cultivation of upland rice at the end of the 1960s (Huon et al, 2013). Elevation across the Houay Xon catchment ranges between 272 and 1300 m a.s.l.…”

Section: Study Sitementioning

confidence: 99%

“…Our results are therefore very likely to reflect the composition and behaviour of particle-bound organic matter, as the dissolved fraction was negligible. To expand the topsoil data set available for the catchment (Huon et al, 2013), additional soil cores were collected on hillslopes connected to the Houay Pano stream and the Houay Xon River (Fig. 1) in May and 11.6 12.2 1.1 3.9 * EWD = total water discharge minus baseflow discharge; * * SR = EWD/drainage area; * * * RC = 100 × (SR/rainfall) assuming an homogeneous cumulative rainfall of 27 mm.…”

Section: Sample and Data Collectionmentioning

confidence: 99%

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Sources and export of particle-borne organic matter during a monsoon flood in a catchment of northern Laos

et al. 2015

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Abstract. The yields of the tropical rivers of Southeast Asia supply large quantities of carbon to the ocean. The origin and dynamics of particulate organic matter were studied in the Houay Xon River catchment located in northern Laos during the first erosive flood of the rainy season in May 2012. This cultivated catchment is equipped with three successive gauging stations draining areas ranging between 0.2 and 11.6 km 2 on the main stem of the permanent stream, and two additional stations draining 0.6 ha hillslopes. In addition, the sequential monitoring of rainwater, overland flow and suspended organic matter compositions was conducted at the 1 m 2 plot scale during a storm. The composition of particulate organic matter (total organic carbon and total nitrogen concentrations, δ 13 C and δ 15 N) was determined for suspended sediment, soil surface (top 2 cm) and soil subsurface (gullies and riverbanks) samples collected in the catchment (n = 57, 65 and 11, respectively). Hydrograph separation of event water was achieved using water electric conductivity and δ 18 O measurements for rainfall, overland flow and river water base flow (n = 9, 30 and 57, respectively). The composition of particulate organic matter indicates that upstream suspended sediments mainly originated from cultivated soils labelled by their C 3 vegetation cover (upland rice, fallow vegetation and teak plantations). In contrast, channel banks characterized by C 4 vegetation (Napier grass) supplied significant quantities of sediment to the river during the flood rising stage at the upstream station as well as in downstream river sections. The highest runoff coefficient (11.7 %), sediment specific yield (433 kg ha −1 ), total organic carbon specific yield (8.3 kg C ha −1 ) and overland flow contribution (78-100 %) were found downstream of reforested areas planted with teaks. Swamps located along the main stream acted as sediment filters and controlled the composition of suspended organic matter. Total organic carbon specific yields were particularly high because they occurred during the first erosive storm of the rainy season, just after the period of slash-andburn operations in the catchment.

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Section: Composition Of the Potential Sources Of Particulate Organic mentioning

confidence: 97%

Section: Composition Of the Potential Sources Of Particulate Organic mentioning

confidence: 99%

Section: Composition Of the Potential Sources Of Particulate Organic mentioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Sample and Data Collectionmentioning

confidence: 99%

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Sources and export of particle-borne organic matter during a monsoon flood in a catchment of northern Laos

et al. 2015

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Erosion and Principles of Soil Conservation

Valentin¹,

Rajot²

2018

Soils as a Key Component of the Critical Zone 5

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The Multiscale TROPIcal CatchmentS critical zone observatory M‐TROPICS dataset II: Land use, hydrology and sediment production monitoring in Houay Pano, northern Lao PDR

Boithias

Auda

Audry

et al. 2021

Hydrological Processes

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Mountain regions of the humid tropics are characterized by steep slopes and heavy rains. These regions are thus prone to both high surface runoff and soil erosion. In Southeast Asia, uplands are also subject to rapid land-use change, predominantly as a result of increased population pressure and market forces. Since 1998, the Houay Pano site, located in northern Lao PDR (19.85 N 102.17 E) within the Mekong basin, aims at assessing the long-term impact of the conversion of traditional slash-and-burn cultivation systems to commercial perennial monocultures such as teak tree plantations, on the catchment hydrological response and sediment yield. The instrumented site monitors hydro-meteorological and soil loss parameters at both microplot (1 m 2 ) and small catchment (0.6 km 2 ) scales. The monitored catchment is part of the network of critical zone observatories named Multiscale TROPIcal CatchmentS (M-TRO-PICS). The data shared by M-TROPICS in Houay Pano are (1) rainfall, (2) air

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Long-term soil carbon loss and accumulation in a catchment following the conversion of forest to arable land in northern Laos

Cited by 52 publications

References 69 publications

Sources and export of particle-borne organic matter during a monsoon flood in a catchment of northern Laos

Sources and export of particle-borne organic matter during a monsoon flood in a catchment of northern Laos

Erosion and Principles of Soil Conservation

The Multiscale TROPIcal CatchmentS critical zone observatory M‐TROPICS dataset II: Land use, hydrology and sediment production monitoring in Houay Pano, northern Lao PDR

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