Productivity assessment of upland and floodplain soils at Makurdi, Nigeria

Ekwoanya, M.A; Ojanuga, A. G.

doi:10.1016/s0016-7061(01)00155-0

Cited by 13 publications

(10 citation statements)

References 4 publications

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“…The low pH and base saturation are typical of forest soils of Ghana, although they are slightly higher than those reported for the Abenia series by Ahn (1961) and Owusu-Bennoah et al (2002). The observed decrease with depth of the CEC, which occurs in parallel to an increase in clay content and a decrease of organic matter content, is in agreement with the general behaviour of tropical soils (Ekwoanya and Ojanuga 2002), and indicates a major role of the organic fraction on the CEC. The extracted P is closely related to the exchangeable P and, therefore, with the P pool in equilibrium with the soil solution.…”

Section: Discussionsupporting

confidence: 85%

The role of soil in storing carbon in tropical rainforests: the case of Ankasa Park, Ghana

et al. 2010

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Tropical primary rainforests of Africa are an enormous reservoir of carbon (C), most of which, in the common perception, is stored in the biomass. We studied one of these forests, Ankasa, in the southwestern part of Ghana, in terms of quantity and 14 C activity of soil organic carbon (SOC) to elucidate the little known important role of soil in storing carbon in such biomass-rich environments. The stock of carbon in the mineral soil to a depth of 1 m was measured to be 151±20 Mg C ha −1 , a similar value in magnitude to the one of the aboveground biomass being 138-170 Mg C ha −1 , including live and dead wood. Surface litter C is roughly 10% (15±9 Mg C ha −1 ) of the C in the biomass and soil. The radiocarbon measurements indicate that SOC was significantly affected by "bomb C" enrichment, so that "Modern C", namely with a mean radiocarbon age lower than 200 years, is present also deeper than 45 cm in the Bo2 horizon. The mean residence time (MRT) estimated from radiocarbon content are of the order of a few decades in the topsoil and a few centuries in the deeper horizons. Altogether, the MRT values indicate a fast recycle of C compared to temperate or boreal forests, but not as fast as usually believed for tropical forest soils. Making a pondered mean, in the Ankasa forest the time an atom of C resides in soil is not much different from one atom of C in the woody aboveground biomass. Hence, the contribution of soil in storing C is substantial, implying that in primary rainforests it is mandatory to determine the SOC stock and its dynamics, too often neglected or underestimated.

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Section: Discussionsupporting

confidence: 85%

The role of soil in storing carbon in tropical rainforests: the case of Ankasa Park, Ghana

et al. 2010

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“…). On the other hand, the accumulation of coarse sand, which retains less water and nutrients than fine soil (Ekwoanya & Ojanuga ), must inhibit plant emergence and growth on shrub mounds (Li et al. ).…”

Section: Discussionmentioning

confidence: 99%

Shrub cover regulates population dynamics of herbaceous plants at individual shrub scale on the Mongolian steppe

Koyama

Sasaki

Jamsran

et al. 2014

J Vegetation Science

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Questions Do shrubs regulate herbaceous plant community by modifying seed and plant distributions at the individual shrub scale? Do the magnitude and extent of effects at this scale change with shrub cover? Location A desert steppe, Mandalgobi, Mongolia. Methods We compared soil properties, seed accumulation and the establishment of plants of three functional types (annual forb, perennial forb and perennial graminoid) between shrub microsites (on mounds vs mound interspace) at sites differing in shrub coverage (high and low). Results Shrub patches (a legume Caragana microphylla) promoted seed accumulation but inhibited plant establishment on mounds, relative to the mound interspace, for all functional types. However, the effects varied with shrub cover, particularly in the mound interspace, with responses specific to each functional type. The accumulation of soil and annual forb seeds increased with shrub cover at both microsites. Additionally, the density of annual forbs was positively related to shrub cover in the mound interspace. In contrast, the density of perennial forbs and graminoids decreased with increasing shrub cover at both microsites, possibly because of enhanced sand accumulation. Conclusion Shrubs shape herbaceous plant community by causing differences at the individual shrub scale in seed and plant distributions. Additionally, we showed that individual shrub effects are shrub cover‐dependent: dense shrub stands enhanced the dominance of annual forbs in spite of the negative effect found at the individual shrub scale, whereas perennial forbs and graminoids were less abundant in denser shrub stands. Shrubs can play an important role in structuring plant communities via shrub cover‐dependent variation at microsites.

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“…The higher value of organic carbon found in the Fadama area soil might be attributed to the decomposed plant parts that would have mixed with the soil, compared to the other land use soils with low organic carbon. Low organic matter in the soils has been attributed to the return of little or no agricultural residue, high rate of transformation and translocation of organic materials in tropical soils (Ojanuga, 1971;Ekwoanya and Ojanuga, 2002.…”

Section: Resultsmentioning

confidence: 99%

Assessment of the effect of Cadmium, Copper and Lead on Soils prorperties with reference to cultivated land use in the Tropical Wet-and Dry Climate

A.O¹,

Adetunji²,

A.O.³

2014

IOSRJAC

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Productivity assessment of upland and floodplain soils at Makurdi, Nigeria

Cited by 13 publications

References 4 publications

The role of soil in storing carbon in tropical rainforests: the case of Ankasa Park, Ghana

The role of soil in storing carbon in tropical rainforests: the case of Ankasa Park, Ghana

Shrub cover regulates population dynamics of herbaceous plants at individual shrub scale on the Mongolian steppe

Assessment of the effect of Cadmium, Copper and Lead on Soils prorperties with reference to cultivated land use in the Tropical Wet-and Dry Climate

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