Soil respiration in eucalypt forests of southeastern Australia

摘要

Soil respiration was measured in five eucalypt forests of southeastern Australia. Regardless of the type of forest, the rate of respiration in soils responded to the addition of an available C source (glucose) and did not to the addition of N or P. Addition of glucose, at up to 100 of the glucose equivalent in soil, increased the rate of respiration sigmoidally. The concentration of glucose needed to achieve the maximum rate of respiration in the topsoil (0–2 cm) of anEucalyptus regnansforest was at least an order of magnitude greater than its equivalent in the soil. The results indicate that microbial respiration in soils from eucalypt forests is limited by an available source of