Soil sample conservation from field to lab for heterotrophic respiration assessment

A System for Heterotrophic Soil Respiration Assessment of Russian Land

Soil respiration (SR) is one of the most important and least understood components of the global carbon cycle. Recent global estimates suggest that soil emits about 98 Pg C per year, which exceeds emission rates from fossil fuel combustion by an order of magnitude [3, 6]. While indicating that soils are the predominant source of CO2 from terrestrial ecosystems, such estimates are still highly u...

Soil respiration under climate warming: differential response of heterotrophic and autotrophic respiration.

Despite decades of research, how climate warming alters the global flux of soil respiration is still poorly characterized. Here, we use meta-analysis to synthesize 202 soil respiration datasets from 50 ecosystem warming experiments across multiple terrestrial ecosystems. We found that, on average, warming by 2 °C increased soil respiration by 12% during the early warming years, but warming-indu...

Effects of Soil Moisture on the Temperature Sensitivity of Soil Heterotrophic Respiration: A Laboratory Incubation Study

The temperature sensitivity (Q10) of soil heterotrophic respiration (Rh) is an important ecological model parameter and may vary with temperature and moisture. While Q10 generally decreases with increasing temperature, the moisture effects on Q10 have been controversial. To address this, we conducted a 90-day laboratory incubation experiment using a subtropical forest soil with a full factorial...

The moisture response of soil heterotrophic respiration: interaction with soil properties

Soil moisture is of primary importance for predicting the evolution of soil carbon stocks and fluxes, both because it strongly controls organic matter decomposition and because it is predicted to change at global scales in the following decades. However, the soil functions used to model the heterotrophic respiration response to moisture have limited empirical support and introduce an uncertaint...

Seed biology – from lab to field