Water repellent effects of manure amended soils on organic matter decomposition, C retention, and respired CO2-C
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Dewpura A. L. Leelamanie
und
Tanuja D. P. Liyanage
Abstract
One option that can be used to mitigate the changes in global climate caused by the elevated levels of atmospheric CO2 is to improve the capacity of soil to act as a carbon (C) sink. Water repellency is known to reduce the mineralization of C, which is considered as a result of the reduced water film thickness and discontinuous water films. The objective of this study was to examine effects of water repellent conditions caused by different manure amendments to an Ultisol on organic matter decomposition, C retention, and respired CO2-C through NaOH trapping. The soils used in the laboratory and field experiments are Rhodudults under USDA soil classification. Cattle manure (CM), goat manure (GM), Gliricidia maculata (GL), and Casuarina equisetifolia (CE) were used as the organic amendments. Soil (0–5 cm) collected for the laboratory experiment were air-dried, passed through a 2 mm sieve, and mixed with ground organic amendments in different ratios (5% CM, 5% GM, 5% GL, 5% CE, with and without intermixed 2% CE). Soil-water contact angle, soil organic matter (SOM) content, retained C (field), and respired CO2 were measured. Laboratory measurements were conducted for a period of 30 d, while field experiments for 9 weeks. Samples with 5% CE showed the highest repellency. Samples with GL, CM, and GM showed slightly higher contact angles when intermixed with 2% CE. The control (mineral soil) showed the lowest contact angle (56.2 ± 3.8°). The SOM contents decreased with time over the 30 d laboratory as well as in the 9-week field experiment. The % depletion of SOM showed a significant difference between the samples with and without intermixed 2% CE only in samples amended with 5% GM. Percentage depletion of SOM content of the samples showed a moderate negative linear correlation with initial soil-water contact angle (R2 = 0.53). The retained C% (as a percentage of added C) in the field was highest in the soil with 5% CE (highest repellent). Samples with 5% GL, CM, and GM intermixed with 2% CE showed significantly higher retained C% than those with no intermixed CE. Samples with 5% CE with the highest initial repellency showed the lowest while those with 5% GL with lowest initial repellency showed the highest respired CO2–C. Both respired CO2–C g in 1 kg of soil and respired CO2–C mg per kg of SOC showed a moderate negative linear correlations (significant at 0.05 probability level) with soil-water contact angle (R2 = 0.58 and 0.48, respectively). The results clearly showed that the C retention capacity of different organic manure amended soils was positively related with the original hydrophobicity of added manures under the field conditions as well.
Acknowledgements
We gratefully acknowledge the Faculty of Graduate Studies, University of Ruhuna for providing financial support through a research grant for post graduate studies (MPhil Research Grant 2015/2016).
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©2016 Institute of Botany, Slovak Academy of Sciences
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Artikel in diesem Heft
- Synthesis of multifunctional γ-PGA-based superparamagnetic iron oxide nanoparticles for magnetic resonance imaging and controlled drug release
- Organic solvent stable protease isolation and characterization from organic solvent tolerant strain of Lysinibacillus sphaericus PAP02
- The impact of grazing absence in inland saline vegetation – a case study from Slovakia
- How dose of biochar and biochar with nitrogen can improve the parameters of soil organic matter and soil structure?
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- Rainfall interception in a disturbed montane spruce (Picea abies) stand in the West Tatra Mountains
- ASL16 gene, a member of AS2/LOB family, is essential for lateral root formation in Arabidopsis
- Meiobenthic Assemblages from the Southwestern Coast of the Black Sea, İğneada (Turkey)
- Oviposition by selected water mite (Hydrachnidia) species from Lake Skadar and its catchment
- Parasitic mesostigmatid mites (Acari) – common inhabitants of the nest boxes of starlings (Sturnus vulgaris) in a Polish urban habitat
- Mayfly (Insecta: Ephemeroptera) assemblages of a regulated perennial Mediterranean river system in the Western Balkans
- Distribution and ecology of the flightless bush-cricket Poecilimon schmidtii at its northern range margin
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