Nitrogen Mineralization Dynamics under Different Moisture Regimes in Tropical Soils

Abera, Girma; Wolde-meskel, Endalkachew; Beyene, Sheleme; Bakken, Lars R.

doi:10.3923/ijss.2012.132.145

Cited by 17 publications

(13 citation statements)

References 18 publications

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“…Hopmans et al (1980) found that the NH + 4 concentration in the culture soils at 20 % moisture content was markedly higher than the levels from the 30 % and 35 % moisture content groups. Abera et al (2012) also revealed a significant reduction in the extractable NH + 4 content in tropical soils when precipitations enhanced. They addressed the possible reason for the decrease in ammonification intensity being the enhanced moisture in soils, because high moisture could significantly restrain the aeration in peat and tropical soils and further lead to a depletion of oxygen (Daniels et al, 2012).…”

Section: Din Sources In the Rajang River Watermentioning

confidence: 88%

Dissolved inorganic nitrogen in a tropical estuary in Malaysia: transport and transformation

et al. 2019

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Abstract. Dissolved inorganic nitrogen (DIN), including nitrate, nitrite and ammonium, frequently acts as the limitation for primary productivity. Our study focused on the transport and transformation of DIN in a tropical estuary, i.e., the Rajang River estuary, in Borneo, Malaysia. Three cruises were conducted in August 2016 and February–March and September 2017, covering both dry and wet seasons. Before entering the coastal delta, decomposition of the terrestrial organic matter and the subsequent soil leaching was assumed to be the main source of DIN in the river water. In the estuary, decomposition of dissolved organic nitrogen was an additional DIN source, which markedly increased DIN concentrations in August 2016 (dry season). In the wet season (February 2017), ammonium concentrations showed a relatively conservative distribution during the mixing, and the nitrate addition was weak. La Niña events induced high precipitations and discharge rates, decreased reaction intensities of ammonification and nitrification. Hence similar distribution patterns of DIN species in the estuary were found in September 2017 (end of the dry season). The magnitude of riverine DIN flux varied between 77.2 and 101.5 t N d−1, which might be an important support for the coastal primary productivity.

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Section: Din Sources In the Rajang River Watermentioning

confidence: 88%

Dissolved inorganic nitrogen in a tropical estuary in Malaysia: transport and transformation

et al. 2019

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“…Soil samples were collected from three sites of the rift valley areas of Ethiopia (Figure 1), Awassa (Site 1), Ziway (Site 2) and Wondo Genet (Site 3), which were under different land use, vegetation cover and climate conditions [18]. The study sites are situated between 6˚3' and 7˚56' N latitude, and between 38˚7' and 38˚38' E longitude at elevations of 1643 -1950 m a.s.l.…”

Section: Study Sitesmentioning

confidence: 99%

“…Site 1 and Site 3 were characterized by sub-humid agroclimatic conditions, while Site 2 was known for its semi-arid climate condition [19]. The soils of the three study sites represent tropical Andosol [17,18]. They were formed from the parental materials of volcanic origin during tertiary and quaternary periods of geologic time [14,15].…”

Section: Study Sitesmentioning

confidence: 99%

“…On the other hand, the coffee land use (Site 3) receives organic fertilizers through litter falls, farmyard manures and compost. The later often receives less management and only once hoeing or cultivation per year [18]. The objective of the present investigation is to explore the physical, chemical and biological properties and SOC stocks of three tropical Andosol under different land uses to provide appropriate management intervention for sustainable utilization.…”

Section: Introductionmentioning

confidence: 99%

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Soil Properties, and Soil Organic Carbon Stocks of Tropical Andosol under Different Land Uses

Abera¹,

Wolde-meskel²

2013

OJSS

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Land use effect of tropical Andosol, with two from crop lands (Site 1 and Site 2) and one from Agroforestry coffee plantation (Site 3) was explored under laboratory conditions to understand their physical, chemical and biological properties and soil organic carbon (SOC) stocks from the rift valley of Ethiopia. Site 3 that acquired less cultivation than others exhibited better aggregate size fraction (AF, 55%), higher aggregate stability (AS, 91%), and greater active microbial biomass (AMB), reflecting better soil structure development. Comparatively, higher total carbon (TC), organic carbon (OC) and total nitrogen (TN) concentrations were recorded in bulk soils and microaggregate fractions of Site 2 and Site 3 than in intensively cultivated Site 1. As expected, microaggregate fractions displayed greater OC and TN than bulk soils across all land uses. Site 1 revealed higher metabolic quotient (qCO₂) and lower SOC stock (2.1 Mg·ha^-1), suggesting microbial stress, while micro nutrients deficiencies were observed with the alkaline soil (Site 2). Conversely, the highest SOC stock was exhibited with Site 3 (4.2 Mg·ha^-1), indicating the importance of coffee land use in C sequestration. Crop lands, depleted much of their native carbon stocks had significant CO₂ sink capacity. Hence, management practices that increase the input of organic resources should be adopted to build SOM and enhance soil fertility.

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“…Consequently, the weather in September 2017 was comparably 'wet' than the dry season in August 2016. Abera et al (2012) revealed a significant reduction in extractable NH4 + content in tropical soils when precipitation enhanced. They addressed that the possible reason for the decreases in ammonification intensity was the enhanced moisture in terrestrial soils, because high moisture could…”

Section: Din Sources In Fresh River Watermentioning

confidence: 98%

Dissolved inorganic nitrogen in a tropical estuary at Malaysia: transport and transformation

Jiang¹,

Müller²,

Jin³

et al. 2019

Preprint

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Abstract. Dissolved inorganic nitrogen (DIN), including nitrate, nitrite and ammonium, frequently acts as the limitation for primary productivity. Our study focused on the transport and transformation of dissolved inorganic nitrogen in a tropical estuary, i.e. Rajang river estuary, in Borneo, Malaysia. Three cruises were conducted in August 2016, February&#8211;March and September 2017, covering both dry and wet seasons. Before entering the coastal delta, decomposition of the terrestrial organic matter and the subsequent soil leaching was assumed to be the main source of DIN in the river water. In the estuary, decomposition of dissolved organic nitrogen was an additional DIN source, which markedly increased DIN concentrations in August 2016 (dry season). In the wet season (February 2017), ammonium concentration showed a relatively conservative distribution during the mixing and nitrate addition was weak. In September 2017 (dry season), La Ni&#241;a induced high precipitation and discharge rates, decreased reaction intensities of ammonification and nitrification and hence the distribution of DIN species in the estuary water was similar with the trend found in the wet season. The magnitude of riverine DIN flux varied between 77.2 and 101.5&#8201;ton&#8201;N&#8201;d-1, which might be an important support for the coastal primary productivity.

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Nitrogen Mineralization Dynamics under Different Moisture Regimes in Tropical Soils

Cited by 17 publications

References 18 publications

Dissolved inorganic nitrogen in a tropical estuary in Malaysia: transport and transformation

Dissolved inorganic nitrogen in a tropical estuary in Malaysia: transport and transformation

Soil Properties, and Soil Organic Carbon Stocks of Tropical Andosol under Different Land Uses

Dissolved inorganic nitrogen in a tropical estuary at Malaysia: transport and transformation

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