Leveraging observed soil heterotrophic respiration fluxes as a novel constraint on global-scale models.

Microbially explicit models may improve understanding and projections of carbon dynamics in response to future climate change, but their fidelity in simulating global-scale soil heterotrophic respiration (RH ), a stringent test for soil biogeochemical models, has never been evaluated. We used statistical global RH products, as well as 7821 daily site-scale RH measurements, to evaluate the spatiotemporal performance of one first-order decay model (CASA-CNP) and two microbially explicit biogeochemical models (CORPSE and MIMICS) that were forced by two different input datasets. CORPSE and MIMICS did not provide any measurable performance improvement; instead, the models were highly sensitive to the input data used to drive them. Spatial variability in RH fluxes was generally well simulated except in the northern middle latitudes (~50°N) and arid regions; models captured the seasonal variability of RH well, but showed more divergence in tropic and arctic regions. Our results demonstrate that the next generation of biogeochemical models shows promise but also needs to be improved for realistic spatiotemporal variability of RH . Finally, we emphasize the importance of net primary production, soil moisture, and soil temperature inputs, and that jointly evaluating soil models for their spatial (global scale) and temporal (site scale) performance provides crucial benchmarks for improving biogeochemical models.

The anatomy of a forbidden desire: men, penetration and semen exchange.

The rising popularity of unprotected anal sex (bareback sex) among men who have sex with men (MSM) is perplexing healthcare providers working in sexual health clinics. Epidemiological research on the topic overlooks several socio-cultural and psychological dimensions. Our research attempts to construct an appropriate theoretical edifice by which we can understand this sexual practice. In order to achieve this objective, a qualitative design was selected and 18 semiconductive in-depth interviews were carried out with barebackers from five European and North American cities. We then analyzed the data using two theoretical approaches that were sensitive to the issues of desire, transgression and pleasure. These theories are those of the late French psychoanalyst, Jacques Lacan, and those of poststructural thinkers, Gilles Deleuze and Felix Guattari. These theoretical frameworks helped shed light on the significance of bareback sex, and can potentially influence healthcare providers in gaining a better understanding not only of their clients, but also of their own role in the circuitry of desire at work within bareback. We found that while the exchange of semen constitutes a dangerous and irrational practice to healthcare professionals, it is nevertheless a significant variable in the sexual lives of barebackers that needs to be taken into consideration in the provision of healthcare services.