Variación estacional en la asimilación neta diaria de CO2 en Quercus magnolifolia Née

the process of photosynthesis has been little studied in oaks (quercus) of méxico, habitats considered the center of origin and diversification of oak species. the seasonal measurements of photosynthesis in forest species are important to identify abiotic environmental factors that are important in regulating this process. the effect of seasonal variation on irradiance, air temperature, relative air humidity and soil water content in daily net co2 uptake for quercus magnolifolia née, was studied during 2004. the experimental design was a randomized complete blocks design; treatments were three measurement dates (june 11, september 3 and october 22) of photosynthesis from june to october 2004. the highest value of daily net co2 uptake was recorded on june 11 at the end of spring and beginning of rains, and not in the summer when the environmental conditions are favorable for photosynthesis in plants with c3 photosynthetic metabolism as q. magnolifolia. the highest total daily net co2 uptake coincided with the highest values of both irradiance and temperature and when rains began.