A Whole-plant, Open, Gas-exchange System for Measuring Net Photosynthesis of Potted Woody Plants

Effects of seasonal drought on net carbon dioxide exchange from a woody-plant-encroached semiarid grassland

[1] Annual precipitation in the central and southern warm-desert region of North America is distributed climatologically between summer and winter periods with two prominent dry periods between them. We used energy and carbon dioxide (CO2) fluxes from eddy covariance along with standard meteorological and soil moisture measurements at a semiarid savanna in southern Arizona, United States, to be...

Measuring Cold Hardiness in Woody Plants

Age-related changes in photosynthesis of woody plants.

Woody peoffnials do not appear to go through a defined senescence phase but do have predictable developmental stages. Reduced photosynthesis and stomatal conductance have been reported at all developmental transitions, although some studies have shown the opposite. What causes these changes and why do results differ among studies? Do these changes result from or cause changes in growth? What ar...

Whole-plant gas exchange and reductive biosynthesis in white lupin.

Simultaneous measurements of CO(2) (CER) and O(2) (OER) exchange in roots and shoots of vegetative white lupin (Lupinus albus) were used to calculate the flow of reducing power to the synthesis of biomass that was more reduced per unit of carbon than carbohydrate. On a whole-plant basis, the diverted reductant utilization rate (DRUR which is: 4 x [CER + OER]) of shoot tissue was consistently hi...

Interpreting Woody Plant Richness from Seasonal Ratios of Photosynthesis

In forested portions of Oregon, species richness of woody plants on plots 400–500 m2 ranged from 1 to .20. We investigated what might account for this variation using a satellite-driven process model that predicts gross photosynthesis and establishes, on a monthly time step, the most constraining environmental variable. Independent satellite and ground-based data confirmed that the highest spec...