Biological Nitrogen Fixation and Nitrogen Fixing Trees

Nair, P. K. R.; Kumar, B. Mohan; Nair, Vimala D.

doi:10.1007/978-3-030-75358-0_17

Cited by 4 publications

(3 citation statements)

References 113 publications

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“…Grasslands showed low soil TN (0.12%), which may be because of the low levels of organic carbon detected (Lebenya et al, 2018).After comparing the TN in the soils of pine and eucalyptus plantations, it was found that the soils of black wattle plantations had a greater mean nitrogen content. Black wattle trees are among the woody nitrogen-fixing trees and are also a member of the legume family (Fabaceae); thus, contributing to an increase in the amount of nitrogen in the soil (Rocha et al 2020); Nair et al, 2021). The results found in this study contradict those of Singwane and Malinga (2012) in Switzerland, who found that pine and eucalyptus plantations significantly increase organic matter and nitrogen in the soil.…”

Section: Soil Phcontrasting

confidence: 89%

“…They are reported to disrupt the soil nutrient cycling, diminish water quality and quantity and cause habitat loss for flora and fauna (Council, 2000;Sharma et al, 2019;Perdomo-González et al, 2023). These trees also contain high levels of allelochemicals that can inhibit a growth of native plants such as shrubs, herbs and grass, hence reducing soil microbial activity and depleting soil nutrients (Mugayi, 2019;Nair et al, 2021;Pairo et al, 2021;Xu et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Comparative Analysis of the Impacts of Commercial Exotic Forestry on Soil Fertility In the Southern Highlands of Tanzania: A Study of Pine, Eucalyptus and Black Wattle Plantations

Mligo,

Masao,

Yanda

2024

Ghana J. Geography

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Pine, eucalyptus and black wattle trees have been planted worldwide for commercial forestry and carbon sequester. These species affect soil fertility differently depending on climate and ecosystem. In the southern highlands of Tanzania, these trees replaced most of the native forests, grasslands and cropland, but their impacts on soil fertility are uncertain. The study compared Pinus patula, Eucalyptus grandis and Acacia meansii (black wattle) forest soils to surrounding natural forests, grasslands and cropland. 18 study sites were selected based on the related location and land use. Each site had two transects; each transect had three 25 m x 20 m rectangular plots for soil sampling. Soil pH, macro and micro-nutrients were measured to determine the soil fertility. The results show that pine, eucalyptus and wattle trees had significantly lower soil organic carbon than cropland and natural forests (p<0.05). The pine and wattle forests had lower pH than the surrounding cropland and natural forests (p<0.05). Farmlands and natural forests had significantly higher mean soil total nitrogen than the pine, eucalyptus and wattle forests (p<0.05). However, the wattle forests had a higher mean TN (1.16%) than the pine and eucalyptus forests (0.13%). Liming and application of phosphate-based fertilisers are recommended when farmers use the harvested exotic tree farms for food crop production.

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Section: Soil Phcontrasting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Impacts of Commercial Exotic Forestry on Soil Fertility In the Southern Highlands of Tanzania: A Study of Pine, Eucalyptus and Black Wattle Plantations

Mligo,

Masao,

Yanda

2024

Ghana J. Geography

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“…The findings indicated that both the plant-available nitrogen forms became higher and higher as trees became older and older. F. albida is among the nitrogen-fixing trees through its symbiotic association with Rhizobium bacterial species [47]. Hence, the increment in the nitrogen forms in soil from under the canopies of F. albida might be due to the addition of biologically fixed nitrogen by the tree and its symbiotic microbial partners.…”

Section: Discussionmentioning

confidence: 99%

Changes in Ammonium-to-Nitrate Ratio along Faidherbia albida Tree Age Gradients in Arenosols

Amare,

Haile,

Birhane

2024

Nitrogen

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Faidherbia albida can enhance the bio-physicochemical fertility of inherently infertile Arenosols. Changes in the soil ammonium (NH4+)-to-nitrate (NO3−) ratio have agricultural, environmental, and ecological implications. Thus, the present study mainly examined the changes in Arenosol NH4+/NO3− ratios, as influenced by varying Faidherbia albida tree age classes. We collected 40 composite soil samples (4 tree age classes×2 soil depths×5 replications) from 0 to 15 and 15 to 30 cm soil depths following core and auger sampling techniques. Analyses of variance have shown that the highest NH4+/NO3− ratios for soil under the old tree canopies are followed by the medium age. In contrast, the significantly lowest NH4+/NO3− ratios were recorded for soil out-of-canopy. Pearson correlation analysis revealed that the NH4+/NO3− ratio was strongly and positively correlated with clay content, total nematode abundance, the fungi/bacterial biomass ratio, cation exchange capacity, microbial biomass carbon, total nitrogen, and soil organic carbon but negative for sand content, bulk density, and pH. The increment in the plant-available forms of nitrogen might be attributed to the accumulation of biologically fixed nitrogen by the Faidherbia albida tree–Rhizobium bacteria symbiosis. The NH4+/NO3− ratio approached one in soil under the old Faidherbia albida trees. The findings suggest that (1) the ability of soil to retain NH4+ increased and (2) the rate of nitrification might be decreased due to inhibition of nitrification by direct and indirect effects of the tree on the nitrifying group of bacteria. The increment in the NH4+/NO3− ratio could also be due to the lowering of the soil’s pH in the older Faidherbia albida trees because lower pH is known to inhibit the activities of nitrifying bacteria. Moreover, maintaining older Faidherbia albida trees in farmlands could contribute to retaining nitrogen and trigger below- and above-ground communities’ successions and ultimately surpass the productivity of arid and semi-arid Arenosols.

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Local Actors, Farmer Decisions and Landscape Crop Diversity in Smallholder Farming Systems: A Systems Perspective

Kpienbaareh,

Mohammed,

Luginaah

et al. 2023

Preprint

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Biological Nitrogen Fixation and Nitrogen Fixing Trees

Cited by 4 publications

References 113 publications

Comparative Analysis of the Impacts of Commercial Exotic Forestry on Soil Fertility In the Southern Highlands of Tanzania: A Study of Pine, Eucalyptus and Black Wattle Plantations

Comparative Analysis of the Impacts of Commercial Exotic Forestry on Soil Fertility In the Southern Highlands of Tanzania: A Study of Pine, Eucalyptus and Black Wattle Plantations

Changes in Ammonium-to-Nitrate Ratio along Faidherbia albida Tree Age Gradients in Arenosols

Local Actors, Farmer Decisions and Landscape Crop Diversity in Smallholder Farming Systems: A Systems Perspective

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