Robert D. Guy

TL;DR: The results provide improved estimates of discrimination factors in several reactions prominent in the global O cycle and indicate that photorespiration plays a significant part in determining the isotopic composition of atmospheric oxygen.

TL;DR: This paper examines the current status and future requirements of modeling global GPP thereby focusing on the light use efficiency approach which expresses GPP as product of the photosynthetically active radiation, the fraction of PAR being absorbed by the plant canopy and the efficiency epsilon which can be converted into biomass.

TL;DR: In this article, the effect of nitrogen stress on needle δ 13 C, water-use efficiency (WUE) and biomass production in irrigated and dry land white spruce (Picea glauca (Moench) Voss) seedlings was investigated.

TL;DR: Stable-isotope discrimination factors (D) for the uptake of oxygen during respiration by a variety of plant materials were determined by measuring 18O enrichment in a closed system to estimate the partitioning of electron transport between the two pathways at steady-state by linear interpolation between the Ds characteristic of cyanide-resistant and cyanid-sensitive respiration.

TL;DR: Robust relationships between traits, population structure and geoclimate in P. trichocarpa reflect patterns which suggest that range-wide geographical and environment gradients have shaped its genotypic and phenotypic variability.