Land use strongly influences soil organic carbon and bacterial community export in runoff in tropical uplands

Rapid development and associated land‐use change have resulted in increased soil erosion and widespread land degradation in tropical ecosystems. Precipitation‐induced soil erosion causes the export of soil organic carbon (SOC) and the associated bacterial community affecting soil quality and functio...

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Published in:Land degradation & development Vol. 31; no. 1; pp. 118 - 132
Main Authors: Le, Huong T., Rochelle‐Newall, Emma, Ribolzi, Olivier, Janeau, Jean Louis, Huon, Sylvain, Latsachack, Keooudone, Pommier, Thomas
Format: Journal Article
Language:English
Published: Chichester Wiley Subscription Services, Inc 15.01.2020
Wiley
Subjects:
Bacteria
bacterial communities
bacterial function
Biodegradation
biodiversity
Carbon
Carbon cycle
Dissolved organic carbon
ecosystems
Environmental Sciences
eroded soils
Erosion mechanisms
Exports
Functional groups
highlands
Land degradation
Land use
land use change
Life Sciences
losses from soil
Nitrogen cycle
plantations
Quality assessment
rain simulation
rainfall simulation
rice
Runoff
soil bacteria
Soil degradation
Soil erosion
Soil microorganisms
soil organic carbon
Soil quality
Soils
Surface runoff
Surface water
suspended sediment
Suspended sediments
Tectona grandis
Understory
unsustainable land use
watersheds
bacterial function
land degradation
unsustainable land use
rain simulation
soil erosion
ISSN:1085-3278, 1099-145X
Online Access:Get full text
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Summary:Rapid development and associated land‐use change have resulted in increased soil erosion and widespread land degradation in tropical ecosystems. Precipitation‐induced soil erosion causes the export of soil organic carbon (SOC) and the associated bacterial community affecting soil quality and functioning. We assessed the transfer of SOC and soil bacterial diversity and functions in surface water runoff from different land uses: Teak with and without understory (TW and TWO, respectively) and upland rice (UR) in a tropical, upland catchment during a simulated rain event. Total suspended sediment (TSS) concentration was higher in TWO (1.23 ± 0.21 g L−1) than in TW (0.37 ± 0.16 g L−1) and UR (0.44 ± 0.2 g L−1), whereas dissolved organic carbon (DOC) concentration was lower under TWO (3.8 ± 0.7 mg L−1) than under TW or UR (13.4 ± 7.5 and 9.57 ± 4.8 mg L−1, respectively). Runoff from TWO harboured the highest proportion of bacterial taxa common to soil (27% and 29.5%) as compared with TW (22.8% and 13%) and UR (17.3% and 7%) for both particle attached and free‐living fractions, respectively. Bacterial community export in surface runoff was driven by changes in DOC and TSS, suggesting that eroded soil particles simultaneously carry organic carbon and attached bacterial taxa in surface runoff. Consequently, the export of soil functional groups relating to organic carbon degradation and nitrogen cycle was higher under TWO than in TW or UR. Our results underline that teak plantations with unsustainable practices such as the removal of understory degrades soil functions and accelerates land degradation through soil erosion and surface runoff on the long term.
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ISSN:1085-3278
1099-145X
DOI:10.1002/ldr.3433