Global pattern of soil nitrogen stable isotope composition: Partitioning N loss by natural abundance. By Ning Dong

The natural abundance of δ15N has been widely in research on terrestrial nitrogen cycling. The variations of material’s stable isotopes composition in natural abundance due to the enzymatic preferences for light N (14N), especially during enzymatic kinetic processes, therefore isotope fractionations can be used as integrators of different processed during nitrogen cycling (Robinson, 2002). Also … Continue reading Global pattern of soil nitrogen stable isotope composition: Partitioning N loss by natural abundance. By Ning Dong

Increasing vegetation light use efficiency in the high latitudes of the northern hemisphere. By Rebecca Thomas

In the high latitudes of the northern hemisphere (north of 45N), we have observed an increase in the amplitude of the seasonal cycle of CO2 of 5.0±0.8ppm over the last 50 years. In other words, vegetation exchanged 57±9.8% more CO2 with the atmosphere in 2009-10 compared to 1958-611. In previous posts, I have shown that … Continue reading Increasing vegetation light use efficiency in the high latitudes of the northern hemisphere. By Rebecca Thomas

Optimality explains photosynthetic responses to elevation. By Wang Han

Alpine plants have long fascinated ecologists, and provide a rich variety of adaptations to extremes of low temperature, wind strength, and others stressors. But just one aspect of high-elevation environments is unique, namely the low atmospheric pressure. There has been speculation about how low pressure might influence plant physiology. For example, it has been suggested … Continue reading Optimality explains photosynthetic responses to elevation. By Wang Han

Mycorrhizal type as a primary control on the CO2 fertilization effect in nitrogen-limited ecosystems. By Cesar Terrer-Moreno

Terrestrial ecosystems sequester annually about a quarter of anthropogenic CO2 emissions, slowing climate change appreciably. The terrestrial carbon sink is generally attributed to the effect of increasing atmospheric CO2 concentrations via the CO2 fertilization effect” (CFE) on plant biomass. However, results from CO2 enrichment (eCO2) experiments range from large and persistent to transient or even … Continue reading Mycorrhizal type as a primary control on the CO2 fertilization effect in nitrogen-limited ecosystems. By Cesar Terrer-Moreno

T model – a simple carbon allocation model for tree growth. Two case studies for both high and low [CO2]. By Li Guangqi (Macquarie University)

Tree ring width is one of the most important materials for past climate reconstruction. However, “divergence” problem (correlation strength between temperature and ring width breaks where temperature was conferred as the limiting factors in high elevation and high latitude regions and ring width data are previously applied for temperatures) challenges the classical dendrochronology principle of … Continue reading T model – a simple carbon allocation model for tree growth. Two case studies for both high and low [CO2]. By Li Guangqi (Macquarie University)

How plants take heat from the environment? By Ning Dong

The leaves interact with the above physical environment in two ways: energy & mass exchange. From the biophysical control aspect, leaves can maintain their temperatures within a narrower range than ambient temperatures, which can be predicted by leaf energy balance theory. We present and predict the existence of crossover temperature by field observation (Fig.1 & … Continue reading How plants take heat from the environment? By Ning Dong

The Fertility Question: How do soil nutrients influence the carbon cycle? By Beni Stocker

A general notion of “soil fertility” is commonly left unaccounted for in models of the terrestrial biosphere and has received relatively little attention in carbon cycle science. This changed since the presentation of results by Vicca et al. (2012) and Fernandez-Martinez et al. (2014). Using data from forests around the globe where gross primary productivity … Continue reading The Fertility Question: How do soil nutrients influence the carbon cycle? By Beni Stocker