Nitrogen availability determines the long-term impact of land use change on soil carbon stocks in  grasslands of southern Ghana

Nyameasem, John Kormla; Reinsch, Thorsten; Taube, F.; Domozoro, Charles Yaw Fosu; Marfo-Ahenkora, E.; Emadodin, Iraj; Malisch, Carsten Stefan

doi:10.5194/soil-6-523-2020

Cited by 9 publications

(8 citation statements)

References 88 publications

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“…Similar results were obtained by Nguetnkam (2004) in the Far North Region of Cameroon and Moustakas (2012) in the north-eastern part of Greece. Low pH in the bleached layer of Planosols might be due to ferrolysis processes which have been suggested to explain oxides (Mn-Fe) segregation and gleying in such environments (Singh et al, 1998;Barbiero et al, 2010) and textural variations (O'Geen et al, 2008;Van Ranst et al, 2011;da Silva et al, 2019). It is common for Planosols to present pH < 5.5 due to acidification and destruction of clay minerals, leaving only quartz as the major constituent (Brinkman, 1970;Spiau and Pedro, 1986;Van Breemen and Buurman, 2002).…”

Section: Soil Physical Propertiesmentioning

confidence: 99%

“…Studies on the Sudano-Sahelian part of the country are scare, and the few that exist are mainly available in unpublished reports or are more concerned with C stocks in plant biomass (Ibrahim and Habib, 2008;Tchobsala et al, 2014Tchobsala et al, , 2016. Moreover, many studies have ignored deeper SOC in the world (Ruiz Sinoda et al, 2012;Tornquist et al, 2009;Nyameasem et al, 2020;Schaefer et al, 2020;Mabicka et al, 2021). The present work aims to evaluate the SOC stock (SOCS) in the main soil types under the natural dry tropical area in the Sudano-Sahelian zone of Cameroon.…”

Section: Introductionmentioning

confidence: 99%

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Effects of environmental factors and soil properties on soil organic carbon stock in a natural dry tropical area of Cameroon

Tsozué¹,

Noubissie

Mamdem

et al. 2021

SOIL

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Abstract. Research carried out on soil organic carbon stock (SOCS) in the Sudano-Sahelian region of Cameroon is very rare. The few existing studies are mostly available in reports and concern in most cases carbon stocks in plant biomass. In order to contribute to the documentation on soils in this part of the country, the present work was designed to evaluate the SOCS in the main soil types and the influence of environmental factors and soil properties on these stocks under the natural dry tropical area of the Sudano-Sahelian zone of Cameroon. The study was undertaken in four sites, including three natural forest reserves (Laf, Zamai, Kosohon) and one national park (Mozogo), located at different latitudes. Three replicates were collected at each site, giving rise to three sampling points chosen per site, from 0 to 75 cm depth, for the determination of SOCS. At each sampling point, soils were sampled using depth increments of 25 cm from the surface. The studied area is covered by Haplic Vertisols, Dystric Arenosols, Dystric Leptosols and Dystric Planosols. Total SOCS (T-SOCS) content, which refers to a depth of 75 cm, decreases with increasing latitude, with 249±26.26 Mg ha−1 in Vertisols at Laf forest reserve most southerly located, 199±8.00 Mg ha−1 in Arenosols at Zamai forest reserve, 166±16.63 Mg ha−1 in Leptosols at Kosohon forest reserve and 161±8.88 Mg ha−1 in Planosols at Mozogo national park most northerly located, regardless of the altitude. No significant correlation was noted between T-SOCS and the altitude. A good correlation was noted between precipitation which decreases with increasing latitude and T-SOCS, indicating the importance of climate in the distribution of T-SOCS in the study area, which directly influences the productivity of the vegetation. More than 60 % of the SOCS was stored below the first 25 cm from the soil surface, a peculiarity of SOCS in drylands. The SOCS in the Sudano-Sahelian area of Cameroon is mainly influenced by climate and vegetation.

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Section: Soil Physical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of environmental factors and soil properties on soil organic carbon stock in a natural dry tropical area of Cameroon

Tsozué¹,

Noubissie

Mamdem

et al. 2021

SOIL

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“…A possible reason explaining why the simulated soil nutrient dynamics may not properly capture the variability of nutrient balances observed across African savannas is because in the agro-ecosystems many cropping fields are selectively tilled with hoes, which is a less invasive technique than the broadcast tillage resulting from animal or mechanical traction plowing [119], as it is typically simulated in one-dimensional models. Finally, it must be pointed out that, despite significantly higher nutrient losses occur in the hydromorphic soil, regardless of the management treatment, this is likely to be driven by the higher levels of nutrient uptake by plants combined with biomass exported from the system, more than by the soil type itself.…”

Section: Nutrient Cycles and Nutrient Use Efficiencymentioning

confidence: 99%

Simulating the Capacity of Rainfed Food Crop Species to Meet Social Demands in Sudanian Savanna Agro-Ecologies

Martínez

Fürst

2021

Land

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West African land use systems have been experiencing one of the fastest transformations in the world over recent decades. The Sudanian savanna is an interesting example, as it hosts the cultivation of some crops typical of the Guinean savanna as well as some of the Sahel. Therefore, this region is likely to experience further changes in its crop portfolio over the next decades due to crop migration processes responding to environmental change. Simulation approaches can guide the development of agricultural production strategies that contribute to sustainably optimize both food and fuel production. This study used crop models already available in the APSIM platform to simulate plant production and the soil water and nutrient cycles of plots cultivated with groundnut, millet, sorghum, maize, and rice on three (two upland and one lowland) soil fertility classes and subjected to five levels of management (conventional tillage without residue incorporated to the soil and nor fertilizer application; conventional tillage without residue incorporated to the soil and 5 kg N ha−1; conventional tillage with residue incorporated to the soil 20 kg N ha−1, and no-till herbicide treated with 50 and 100 kg N ha−1). Simulation outputs were contrasted against data reported in the literature and converted into nutritional, fuel and feed yields based on the qualities and uses of their different plant comparments. Groundnut yields outperformed all of the cereals across most growing conditions, nutritional and feed indicators. Maize and rice provided the highest caloric yields, with the least fertile growing conditions. Sorghum provided average to high caloric and iron yields across all of the treatments. Millet provided the highest iron yields and high fuel yields across most treatments. Some simulated treatments could not be compared against literature review data because of their absence in actual cropping systems and the lack of experimental data. Plant production was simulated with higher accuracy than the other components of the simulation. In particular, there is a need to better parameterize and validate the rice, groundnut and millet models under Sudanian savanna conditions in order to perform more accurate comparative assessments among species.

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“…The dataset, as well as a brief description of the site, materials and methods adopted to generate data is available in Nyameasem et al (2020).…”

Section: Plant Sampling and Proanthocyanidin Analysesmentioning

confidence: 99%

Nitrogen availability determines the long-term impact of land-use change on soil carbon stocks in grasslands of southern Ghana

Nyameasem¹,

Reinsch²,

Taube³

et al. 2020

Preprint

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Abstract. Enhancing the capacity of agricultural soils to resist soil degradation and to mitigate climate change requires long-term assessments of land-use systems. Such long-term evaluations, particularly regarding low-input livestock systems, are limited. This study evaluated the impact of long-term land-use practices, condensed tannins (CT) and soil nutrient status on carbon cycling in arable and permanent systems of a tropical Savannah. Soil samples were taken (0–30 cm depth) from arable crop fields, grazed-seeded grassland, cut-use permanent crops and native grassland. Soil organic carbon (SOC) stocks ranged from 19.9 to 36.8 Mg SOC ha−1 (mean ± sd = 32.9 ± 0.2 Mg ha−1). SOC stocks were lower for grazed-seeded grassland relative to cut-use grass, legume trees and shrubs. Within sown systems, nitrogen availability seemed to be the most critical factor that determines the fate of the SOC stocks, with soil nitrogen (N) concentration and the SOC being highly correlated (r = 0.90; p

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Nitrogen availability determines the long-term impact of land use change on soil carbon stocks in grasslands of southern Ghana

Cited by 9 publications

References 88 publications

Effects of environmental factors and soil properties on soil organic carbon stock in a natural dry tropical area of Cameroon

Effects of environmental factors and soil properties on soil organic carbon stock in a natural dry tropical area of Cameroon

Simulating the Capacity of Rainfed Food Crop Species to Meet Social Demands in Sudanian Savanna Agro-Ecologies

Nitrogen availability determines the long-term impact of land-use change on soil carbon stocks in grasslands of southern Ghana

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