Assessment of the Nutrient Status of Soil under &lt;em&gt;Chromolaena odorata&lt;/em&gt; L. (Siam Weed) Fallow in Moniya, Oyo State Southwestern Nigeria

Imiolemen, SO; Iwara, AI; Ndakara, OE; Deekor, T. N.; Ita, AE

doi:10.4314/ejesm.v5i3.5

Cited by 3 publications

(2 citation statements)

References 11 publications

(16 reference statements)

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“…When a part of the rainforest is cut down for any use, the trees hardly regenerate (Amiolemen, Iwara, Ndakara, Deekor & Ita, 2012). However, after certain time range, fallows begin to set in, which further develop into secondary re-growth without the original structural characteristics of a typical rainforest Ndakara, 2009).…”

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Island Rainforests and Secondary Groves in Southern Nigeria

Ndakara,

Ohwo

2023

East Afr. j. for. agrofor.

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This study characterized the structural attributes of island rainforests and secondary groves within Orogun region in southern Nigeria. The quasi-experimental design was used, and the vegetation structural characteristics were determined in both secondary groves (experimental sites) and island rainforests (control sites). The randomized systematic sampling was employed in dividing the study area into 6 zones which were selected upon the presence of mature rainforest islands and secondary groves respectively. Six plots were sampled in each ecosystem. Tree heights, tree girths, and plot sizes were the data collected. Both secondary groves and island rainforest plots were measured to first determine uniformity in the area covered by the trees, after which, size of 200 ft X 100 ft was chosen as the uniform area of plot from which data were gathered. Tree girths at breast height were determined using measuring tape; while tree heights were determined by the use of Abney level and measuring tape. The 15.0 version of the Statistical Package for the Social Sciences (SPSS) was used in the statistical tests of the stated hypotheses. Statistical results showed that t-value = 7.05, P(0.001) > 0.05 for tree heights; and t-value = 3.122, P(0.026) > 0.05 for the tree girths. The mean differences in the structural characteristics between the secondary and mature island rainforest were significant at 0.05 alpha level. This implies that trees within island rainforests are significantly taller and bigger. The higher structural attributes of the island rainforest revealed that over time, conservation of rainforest trees could positively impact on its structural attributes. Therefore, ecosystem-based management approach was recommended for the management and conservation of the rainforest trees and covers

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Section: Introductionmentioning

confidence: 99%

Structural Characterization of Island Rainforests and Secondary Groves in Southern Nigeria

Ndakara,

Ohwo

2023

East Afr. j. for. agrofor.

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“…After a forested area is cleared for agriculture, plantations, or agroforestry, a series of changes occur (Phil-Eze 2010; Amiolemen et al 2012;Ndakara and Ofuoku 2020). The most conspicuous changes are observed in vegetation compositions, structure, and soil properties (Gruba and Mulder 2015;Augusto et al 2017;Suzuki et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The impacts of Hevea brasiliensis (rubber tree) plantation on soil nutrients in Southern Nigeria

NDAKARA

OHWO²

2022

Nusantara Biosci

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Abstract. Ndakara OE, Ohwo O. 2022. The impacts of Hevea brasiliensis (rubber tree) plantation on soil nutrients in Southern Nigeria. Nusantara Bioscience 14: 234-239. This study investigated how Hevea brasiliensis (Willd. ex A.Juss.) Müll.Arg. impact on the soils within the humid rainforest ecosystem of Nigeria. The study used quasi-experimental and stratified random sampling techniques to select sampling units. Samples of soils under H. brasiliensis and rainforest (the control) were collected using an auger, and their laboratory analyses for total organic matter (TOM), total nitrogen (N), available phosphorus (P), exchangeable potassium (K), and pH were carried out using standard methods. Data generated were statistically analyzed using the mean, standard deviation, standard error of mean, and t-test. Findings showed that the soils under rainforest have higher nutrient properties than plantations of H. brasiliensis. Soil pH values were lower under rainforest than under plantations of H. brasiliensis. While TOM, N, and K differed significantly between rainforest and H. brasiliensis at a 5% confidence level, available phosphorus and pH were insignificant at a 5% confidence level. Tree species' capability to improve soil nutrition reflects its positive impact on the ecosystem. Since soil nutrients under H. brasiliensis are lower than soil nutrients under rainforest, efficient application of organic manure is required to improve the soil nutrient status for sustainable ecosystem functioning and management of the degraded rainforest environment.

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Chromolaena odorata invasion in Nigeria: A case for coordinated biological control

Uyi¹,

Ekhator²,

Ikuenobe³

et al. 2014

MBI

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The presence of the North American Marmorkrebs (Procambarus fallax f. virginalis) in European inland waters is entirely driven by ongoing propagule pressure from the ornamental trade. Since 2003 at least 25 independent introduction events have been confirmed, of which some have eventually resulted in established populations. This study links a maximum-entropy model that forecasts the probability of Marmorkrebs introduction based on socioeconomic predictors to an updated species distribution model based on environmental predictors in order to explore the risk of further Marmorkrebs establishment in Europe. In line with related research, the probability of Marmorkrebs release was largely affected by gross domestic product and human population density, i.e. predictors very likely related to the density of Marmorkrebs owners, whereas environmental suitability was mostly influenced by minimum temperature and the availability of lentic habitats, which was indirectly assessed by terrain slope. While considerable parts of Europe were predicted as potentially suitable for establishment, high probabilities of introduction were forecasted in much smaller geographic areas. The consensus map of the model predictions suggests that introduction and subsequent establishment of Marmorkrebs is likely to occur in much of Germany, the Benelux countries, England, Italy, and areas of high human population density throughout France and Spain, as well as parts of southernmost Scandinavia and Southeastern Europe. Monitoring trades of Marmorkrebs in these high-risk regions is recommended and implications for proactive measures are discussed, including the need for consistent trade regulations at the EU level.

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Assessment of the Nutrient Status of Soil under <em>Chromolaena odorata</em> L. (Siam Weed) Fallow in Moniya, Oyo State Southwestern Nigeria

Abstract: In Nigeria, soil fertility restoration for improved agricultural production is a recurrent issue of immense importance mostly with her ever increasing population currently above 150 million.

Cited by 3 publications

References 11 publications

Structural Characterization of Island Rainforests and Secondary Groves in Southern Nigeria

Structural Characterization of Island Rainforests and Secondary Groves in Southern Nigeria

The impacts of Hevea brasiliensis (rubber tree) plantation on soil nutrients in Southern Nigeria

Chromolaena odorata invasion in Nigeria: A case for coordinated biological control

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