Stable isotope ratios and reforestation potential in Acacia koa populations on Hawai’i

Lawson, Shaneka S.; Pike, Carrie

doi:10.15287/afr.2017.805

Cited by 3 publications

(4 citation statements)

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“…Water use efficiency by plants has been reported to decrease with water in the soil and increase with the soil water decline (Fang et al 2010;Hartman and Danin 2010;Lawson and Pike 2017;Mapope and Dakora 2016). In this present study, the values obtained show these accessions could be stable in their expression of water use.…”

Section: Discussionsupporting

confidence: 56%

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Variation in winged bean (Psophocarpus tetragonolobus) growth parameters, seed yield, nodulation, and nitrogen fixation

et al. 2021

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Abstract. Adegboyega TT, Abberton MT, Abdelgadir AH, Mahamadi D, Olaniyi OA, Ofodile S, Babalola OO. 2021. Variation in winged bean (Psophocarpus tetragonolobus) growth parameters, seed yield, nodulation, and nitrogen fixation. Asian J Agric 5: 61-71. Underutilized legumes are widely distributed in tropical agriculture and associated with low yield. Thus they have not really been fully explored due to lack of research investment, breeding programs targeting crop improvement, marketing, and low awareness of nutritional benefits. This study was conducted to determine the variation in growth parameters, seed yield, nodulation, and nitrogen fixation in winged bean (Psophocarpus tetragonolobus) germplasms. High genotypic and phenotypic coefficients of variances were observed in traits evaluated. The combined analysis of variance for five variables of 25-winged bean accessions showed that replication by year interaction was statistically significant (p ? 0.0001) for nodule parameters and dry shoot weight while it was not significant (p = > 0.05) for dry root weight, and total biomass. Significant variations (p = ? 0.05) were observed among the accessions on some growth parameters. The genetic variability of winged beans could be carefully exploited to provide higher grain yield, as well as other economic and important traits to boost food security and conservation of the plant genetic materials.

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Section: Discussionsupporting

confidence: 56%

“…The δ 15 N value varied from 3.34 (Tpt18) to 0.86 (Tpt3-B) in the shoots and from 3.07 (Tpt15) to 0.49 (Tpt32) for roots (Table 8). The δ 13 C of C3 plants explained their water-use ability (Lawson and Pike 2017). Analysis of variance of δ 13 C from shoots and roots revealed highly significant variation (p= ≤.0001.)…”

Section: Resultsmentioning

confidence: 95%

Variation in winged bean (Psophocarpus tetragonolobus) growth parameters, seed yield, nodulation, and nitrogen fixation

et al. 2021

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“…Neirynck et al [ 48 ] mentioned that different tree species such as Acer psedoplatanus , Fraxinus excelsior , and Tilia platyphyllos significantly affect the C:N ratio and it was related mainly to litter quality. Lovett et al [ 49 ] also revealed that forest structure alters the C and N dynamics because species composition affects nutrient cycling under their different canopy structures, which can substantially influence the forest ecosystems’ overall nutrient turnover rates [ 50 , 51 ].…”

Section: Discussionmentioning

confidence: 99%

“…Rehman et al [ 53 ] reported that various forest protection activities could influence stable isotopic abundance and C:N ratios. Moreover, it is generally believed that multiple factors such as light availability, litter input, water use efficiency, soil physical, chemical, and biological properties altered by the forest types may affect natural isotopic abundance in forest ecosystems [ 50 , 51 ].…”

Section: Discussionmentioning

confidence: 99%

Unraveling the Influence of Land-Use Change on δ13C, δ15N, and Soil Nutritional Status in Coniferous, Broadleaved, and Mixed Forests in Southern China: A Field Investigation

Farooq

Shakoor

et al. 2021

Plants

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Natural isotopic abundance in soil and foliar can provide integrated information related to the long-term alterations of carbon (C) and nitrogen (N) cycles in forest ecosystems. We evaluated total carbon (TC), total nitrogen (TN), and isotopic natural abundance of C (δ13C) and N (δ15N) in soil and foliar of coniferous plantation (CPF), natural broadleaved forest (NBF), and mixed forest stands at three different soil depths (i.e., 0–10, 10–20, and 20–40 cm). This study also explored how soil available nutrients are affected by different forest types. Lutou forest research station, located in Hunan Province, central China, was used as the study area. Results demonstrated that the topsoil layer had higher TC and TN content in the mixed forest stand, resulting in a better quality of organic materials in the topsoil layer in the mixed forest than NBF and CPF. In general, soil TC, TN, and δ15N varied significantly in different soil depths and forest types. However, the forest type did not exhibit any significant effect on δ13C. Overall, soil δ13C was significantly enriched in CPF, and δ15N values were enriched in mixed forest. Foliar C content varied significantly among forest types, whereas foliar N content was not significantly different. No big differences were observed for foliar δ15N and δ13C across forest types. However, foliar δ13C and δ15N were positively related to soil δ13C and δ15N, respectively. Foliar N, soil and foliar C:N ratio, soil moisture content (SMC), and forest type were observed as the major influential factors affecting isotopic natural abundance, whereas soil pH was not significantly correlated. In addition, forest type change and soil depth increment had a significant effect on soil nutrient availability. In general, soil nutrient availability was higher in mixed forest. Our findings implied that forest type and soil depth alter TC, TN, and soil δ15N, whereas δ13C was only driven by soil depth. Moreover, plantations led to a decline in soil available nutrient content compared with NBF and mixed forest stands.

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Isoscapes of remnant and restored Hawaiian montane forests reveal differences in biological nitrogen fixation and carbon inputs

Wall

Swift

D’Antonio

et al. 2023

PeerJ

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Deforestation and subsequent land-use conversion has altered ecosystems and led to negative effects on biodiversity. To ameliorate these effects, nitrogen-fixing (N2-fixing) trees are frequently used in the reforestation of degraded landscapes, especially in the tropics; however, their influence on ecosystem properties such as nitrogen (N) availability and carbon (C) stocks are understudied. Here, we use a 30-y old reforestation site of outplanted native N2-fixing trees (Acacia koa) dominated by exotic grass understory, and a neighboring remnant forest dominated by A. koa canopy trees and native understory, to assess whether restoration is leading to similar N and C biogeochemical landscapes and soil and plant properties as a target remnant forest ecosystem. We measured nutrient contents and isotope values (δ15N, δ13C) in soils, A. koa, and non-N2-fixing understory plants (Rubus spp.) and generated δ15N and δ13C isoscapes of the two forests to test for (1) different levels of biological nitrogen fixation (BNF) and its contribution to non-N2-fixing understory plants, and (2) the influence of historic land conversion and more recent afforestation on plant and soil δ13C. In the plantation, A. koa densities were higher and foliar δ15N values for A. koa and Rubus spp. were lower than in the remnant forest. Foliar and soil isoscapes also showed a more homogeneous distribution of low δ15N values in the plantation and greater influence of A. koa on neighboring plants and soil, suggesting greater BNF. Foliar δ13C also indicated higher water use efficiency (WUEi) in the plantation, indicative of differences in plant-water relations or soil water status between the two forest types. Plantation soil δ13C was higher than the remnant forest, consistent with greater contributions of exotic C4-pasture grasses to soil C pools, possibly due to facilitation of non-native grasses by the dense A. koa canopy. These findings are consequential for forest restoration, as they contribute to the mounting evidence that outplanting N2-fixing trees produces different biogeochemical landscapes than those observed in reference ecosystems, thereby influencing plant-soil interactions which can influence restoration outcomes.

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Stable isotope ratios and reforestation potential in Acacia koa populations on Hawai’i

Cited by 3 publications

References 60 publications

Variation in winged bean (Psophocarpus tetragonolobus) growth parameters, seed yield, nodulation, and nitrogen fixation

Variation in winged bean (Psophocarpus tetragonolobus) growth parameters, seed yield, nodulation, and nitrogen fixation

Unraveling the Influence of Land-Use Change on δ13C, δ15N, and Soil Nutritional Status in Coniferous, Broadleaved, and Mixed Forests in Southern China: A Field Investigation

Isoscapes of remnant and restored Hawaiian montane forests reveal differences in biological nitrogen fixation and carbon inputs

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