The study deals with distribution

seasonal dynamics

utilization efficiency and cycling of nutrients. The results show that: nutrient contents in live plant materials were greater than those in dead plant materials

in above ground part greater than those in below ground part. Relative ranking of nutrient contents was K>N>P which was different from that (N>K>P) of most local plant communities. The above ground contents of N

P and K in the grasses rose as the above ground phytomass increased in the early months of the growing season. Furthermore

concentrations of N

P and K of above ground part were reduced due to faster increase of above ground phytomass than the increase of nutrients in the above ground phytomass. In addition

the above ground contents of N

P and K of grasses reached their peak values earlier than did the above ground phytomass. In May the above ground contents of N

P and K were near or had reached the peak. From May to September there were relatively high contents of N

P and K in the above ground standing crop of grasses. After September

the nutrient contents in the grasses tended to decline. The N

P and K mass in net primary production (NPP) was respectively 3732

380 and 5027 mg/(m 2 a).The largest fraction of nutrient mass in NPP went to grasses 83 6% for N

87 3% for P and 82 1% for K. In the grassland

nutrient utilization efficiency of grasses was the greatest and that of woody plants was the smallest. The return of N

P and K by litterfall respectively comprises their 52 2%

29 8% and 7 81% in net above ground primary production (NAPP). N and P requirement of 45 0% and 46 6% in NAPP came from internal cycling.