1.Institute of Modern Physics; Chinese Academy of Sciences; Lanzhou 730000; China
2.Institute of Desert Research; China
3.Gansu Agricultural University; Lanzhou 730070; China
Abstract:
The conception of "metabolic pool" is introduced and an ecosystem model consisting of sand body metabolic pool, plant metabolic pool, atmospheric pool and their corresponding channels is established. In addition, the input and output terms of water balance including plant transpiration etc. are measured by tritiated water-tracing dynamical method, etc. and thus a water balance table is obtained. Finally, the plant water balance in the steppified desert environment of the Shapotou area at southeastern fringe of Tengger Desert in China is comprehensively analysed.