PLANT WATER-BALANCE WITH TRITIATED WATER-TRACING DYNAMICAL METHOD

The conception of ''metabolic pool'' is introduced and an ecosystem mo del consisting of sand body metabolic pool, plant metabolic pool, atmo spheric pool and their corresponding channels is established. In addit ion, the input and output terms of water balance including plant trans piration etc. are measured by tritiated water-tracing dynamical method , etc. and thus a water balance table is obtained Finally, the plant w ater balance in the steppified desert environment of the Shapotou area at southeastern fringe of Tengger Desert in China is comprehensively analysed.