he annual net primary productivity (ANPP)of Calamagrostis angustifolia grassland ecosystem is 30579. 17kJ/m￣2, of which 37. 64%were from the aboveground ANPP and62. 36%from the underground ANPP. The Standing caloric content(SCC)in differentorgans/Components varies widely. The SCC in upper roots(0-20cm depth in soil)accountsfor 54. 87%of the total,while SCC in spikes accounts for only 0.03%of the total.The SCCsin other organs/components can be ranked in a decreasing order as follows :Upper roots >stem> leaf>...