20151021
Author : Bowling, D. R. Grote, E. E. Belnap, J.
Journal : Journal of Geophysical Research-Biogeosciences
Comment :
They used soil surface CO2 flux and the amount and carbon isotope composition of soil CO2 as indicators of belowground and soil surface activity. Soil respiration was always below 2 µmol m−2 s−1 and highly responsive to soil moisture. The short‐term temperature sensitivity of respiration was very dynamic, showing enhancement within 1–2 days of rain, and diminishing each day afterward.
No difference was detected in the seasonal activity of C3 and C4 grasses, contrasting with studies from other arid regions (where warm‐ versus cool‐season activity is important), and highlighting the unique biophysical environment of this cold desert. Contrary to other studies, the δ13C of belowground respiration in the rooting zone of each photosynthetic type did not reflect the δ13C of C3 and C4 physiology.
Year : 2011
Title : Rain pulse response of soil CO2 exchange by biological soil crusts and grasslands of the semiarid Colorado Plateau, United StatesJournal : Journal of Geophysical Research-Biogeosciences
Comment :
They used soil surface CO2 flux and the amount and carbon isotope composition of soil CO2 as indicators of belowground and soil surface activity. Soil respiration was always below 2 µmol m−2 s−1 and highly responsive to soil moisture. The short‐term temperature sensitivity of respiration was very dynamic, showing enhancement within 1–2 days of rain, and diminishing each day afterward.
No difference was detected in the seasonal activity of C3 and C4 grasses, contrasting with studies from other arid regions (where warm‐ versus cool‐season activity is important), and highlighting the unique biophysical environment of this cold desert. Contrary to other studies, the δ13C of belowground respiration in the rooting zone of each photosynthetic type did not reflect the δ13C of C3 and C4 physiology.
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