
TY  - JOUR
A1  - Adams, MA 
A1  - Attiwill, PM 
T1  - Role of <I>Acacia</I> Spp. In Nutrient Balance and Cycling in Regenerating <I>Eucalyptus regnans</I> F. Muell. Forests. II. Field Studies of Acetylene Reduction
JF  - Australian Journal of Botany
JO  - Aust. J. Bot.
Y1  - 1984
VL  - 32
IS  - 2
SP  - 217
EP  - 223
KW  - 
UR  - https://doi.org/10.1071/BT9840217 
N2  - Rates of C2H2 reduction by nodules of Acacia dealbata growing in 2-year-old Eucalyptus regnans regeneration were determined at monthly intervals for 1 year under field conditions. Intact soil cores containing roots and nodules showed maximum values of 7.1 &#956;mol h-1 g-1 fresh weight of nodules with a mean value of 4.4 &#956;mol h-1 g-1 fresh weight. Nodule mass was clearly related to climatic conditions, being greatest when both temperature and moisture levels were favourable, and was probably depressed during the sampling period by the prevailing severe drought. From the measured rates of C2H2 reduction, estimated N2 fixation was 12-32 kg ha-1 year-1. Rates of N2 fixation as high as this confirm the role of acacias as fast-growing pioneer species important in maintaining the nitrogen pool of the forest ecosystem. 
ER  -

