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- Dorrepaal, E, et al.
(författare)
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Are growth forms consistent predictors of leaf litter quality and decomposability across peatlands along a latitudinal gradient?
- 2005
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Ingår i: Journal of Ecology. - : Wiley. - 1365-2745 .- 0022-0477. ; 93:4, s. 817-828
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Tidskriftsartikel (refereegranskat)abstract
- Plant growth forms are widely used to predict the effects of environmental changes, such as climate warming and increased nitrogen deposition, on plant communities, and the consequences of species shifts for carbon and nutrient cycling. We investigated whether the relationship between growth forms and patterns in litter quality and decomposition are independent of environmental conditions and whether growth forms are as good as litter chemistry at predicting decomposability. We used a natural, latitudinal gradient in NW Europe as a spatial analogue for future increases in temperature and nitrogen availability. Our screening of 70 species typical of Sphagnum-dominated peatlands showed that leaf litters of Sphagnum mosses, evergreen and deciduous shrubs, graminoids and forbs differed significantly in litter chemistry and that the ranking of the growth forms was independent of the region for all litter chemistry variables. Differences among growth forms were usually larger than differences related to the environmental gradient. After 8 and 20 months incubation in outdoor, Sphagnum-based decomposition beds, growth forms generally differed in decomposability, but these patterns varied with latitude. Sphagnum litters decomposed slower than other litters in all regions, again explaining its high representation in organic deposits of peatlands. Forb litters generally decomposed fastest, while the differences among the other growth forms were small, particularly at higher latitudes. Multiple regression analyses showed that growth forms were better at predicting leaf litter decomposition than chemical variables in warm-temperate peatlands with a high N-load, but less so in the subarctic, low-N region. Our results indicate that environmental changes may be less important in determining ecosystem leaf litter chemistry directly than are their indirect effects through changes in the relative abundance of growth forms. However, climatic and nutritional constraints in high-latitude peatlands promote convergence towards nutrient-efficient plant traits, resulting in similar decomposition rates of vascular growth forms despite differences in litter chemistry. The usefulness of the growth-form concept in predicting plant community controls on ecosystem functioning is therefore somewhat limited.
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- Plüss, Catrine Edström, et al.
(författare)
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Effects of an expanded cardiac rehabilitation programme in patients treated for an acute myocardial infarction or a coronary artery by-pass graft operation
- 2008
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Ingår i: Clinical Rehabilitation. - : SAGE Publications. - 0269-2155 .- 1477-0873. ; 22:4, s. 306-318
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To investigate the effects of expanded cardiac rehabilitation with multifactorial interventions on metabolic and inflammatory markers, exercise performance and on established cardiovascular risk factors. Design: Single-centre prospective randomized controlled trial. Setting: A university hospital. Subjects: Two hundred and twenty-four patients with an acute myocardial infarction or patients undergoing coronary artery by-pass grafting. Intervention: Patients were randomized to expanded cardiac rehabilitation including stress management, increased physical training, staying at a 'patient hotel' and cooking sessions, or to usual cardiac rehabilitation Main measures: Biochemical risk markers and exercise performance; follow-up was one year. Results: There were no significant differences between the two treatment groups in the changes of biochemical risk markers or in exercise performance. Thus, low-density lipoprotein (LDL)-cholesterol levels decreased from 3.00 (0.97) to 2.54 (0.66) mmol/L in the intervention group and from 3.20 (0.85) to 2.54 (0,63) mmol/L in the control group, fibrinogen levels decreased from 5.30 (2.00) to 4.25 (1.01) g/L in the intervention group and from 5.29 (1.89) to 4.33 (0.83) g/L in the control group and C-reactive protein (CRP) levels decreased from 3.04 (2.79) to 2.09 (2.13) mg/L in the intervention group and from 4.01 (3.49) to 2.39 (2.49) mg/L in the control group. Total workload (W) improved from 118 (35) to 136 (34) in the intervention group and from 117 (36) to 133 (39) in the control group. Conclusion: There was no further significant benefit in biochemical risk markers or in exercise performance among patients undergoing the expanded rehabilitation as compared to the control group which received usual cardiac rehabilitation.
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