Soil nitrogen affects phosphorus recycling: foliar resorption and plant–soil feedbacks in a northern hardwood forest

Previous studies have attempted to link foliar resorption of nitrogen and phosphorus to their respective availabilities in soil, with mixed results. Based on resource optimization theory, we hypothesized that the foliar resorption of one element could be driven by the availability of another element. We tested various measures of soil N and P as predictors of N and P resorption in six tree species in 18 plots across six stands at the Bartlett Experimental Forest, New Hampshire, USA. Phosphorus resorption efficiency (P , 0.01) and proficiency (P ¼ 0.01) increased with soil N content to 30 cm depth, suggesting that trees conserve P based on the availability of soil N. Phosphorus resorption also increased with soil P content, which is difficult to explain based on single-element limitation, but follows from the correlation between soil N and soil P. The expected single-element relationships were evident only in the O horizon: P resorption was high where resin-available P was low in the Oe (P , 0.01 for efficiency, P , 0.001 for proficiency) and N resorption was high where potential N mineralization in the Oa was low (P , 0.01 for efficiency and 0.11 for proficiency). Since leaf litter is a principal source of N and P to the O horizon, low nutrient availability there could be a result rather than a cause of high resorption. The striking effect of soil N content on foliar P resorption is the first evidence of multiple-element control on nutrient resorption to be reported from an unmanipulated ecosystem

The stochastic gravitational wave background from turbulence and magnetic fields generated by a first-order phase transition

We analytically derive the spectrum of gravitational waves due to magneto-hydrodynamical turbulence generated by bubble collisions in a first-order phase transition. In contrast to previous studies, we take into account the fact that turbulence and magnetic fields act as sources of gravitational waves for many Hubble times after the phase transition is completed. This modifies the gravitational wave spectrum at large scales. We also model the initial stirring phase preceding the Kolmogorov cascade, while earlier works assume that the Kolmogorov spectrum sets in instantaneously. The continuity in time of the source is relevant for a correct determination of the peak position of the gravitational wave spectrum. We discuss how the results depend on assumptions about the unequal-time correlation of the source and motivate a realistic choice for it. Our treatment gives a similar peak frequency as previous analyses but the amplitude of the signal is reduced due to the use of a more realistic power spectrum for the magneto-hydrodynamical turbulence. For a strongly first-order electroweak phase transition, the signal is observable with the space interferometer LISA.Comment: 46 pages, 17 figures. Replaced with revised version accepted for publication in JCA

“If you want to know the road ahead ask those coming back.”: Reflections on PPI input into the CareCoach Study and open call for carers with lived experience of dementia care to join the PPI team

Around 700,000 family carers support 900,000 people with dementia in the UK. These carers are at risk of becoming overwhelmed as their loved one’s dementia progresses, but interventions aimed at developing personal resilience can help carers to cope better. One intervention that has had a positive impact is an online “coach” which combines self-directed learning (videos and text) with remote input from a support worker. Key benefits include a reduced sense of burden and increased coping with the challenges of caring. Robust measures of the impact are limited due to methodological inconsistencies. The UK-based CareCoach Programme, funded by the National Institute for Health and Care Research (NIHR), is working in partnership with Join Dementia Research, tide (Together in Dementia Everyday), Dementia UK, and Alzheimer’s Society, to address this evidence gap by testing the online coach in a clinical trial. To ensure the intervention realises its full potential the CareCoach team invites applications for public and patient involvement members

Human Worth as Collateral

Human worth has taken on a surprising new role: that of market asset. Specifically, lenders in radically different contexts are using their borrowers’ human worth as collateral in loan transactions. The two examples of this new collateralization that I examine are credit card lending in the United States and microlending programs in the Third World. I conclude that the use of human worth in these two contexts is too similar to be coincidental. Rather, this new collateralization is a product of globalization. For those interested in the effect of law on globalization, this convergence in the market for credit teaches important lessons. In both the contexts I examine, the laws governing secured and unsecured lending fail to recognize human worth as collateral. For this reason, the new collateralization serves as a counter-example to the claimed centrality of the rule of law in economic development