The underground growth of Bothrichloa ischaemum community in extremely arid year were compared with that of the community in 1991 with normal precipitation, and hence, could reflect the effect of drought on underground growth of Bothrichloa ischaemum community. The results indicated that the peak value of underground biomass reached 1249 g·m -2 in extremely arid year, higher than that in normal year (586 g·m -2 ). Most roots distributed downwards in extremely arid year or arid seasons, an...
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