Effect of arid climate on underground growth of Bothrichloa ischaemum community

Abstract

Abstract: The underground growth of Bothrichloa ischaemum community in extremely arid year were compared with that of the community in1991 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穖^-2 in extremely arid year, higher than that in normal year (586 g穖^-2). Most roots distributed downwards in extremely arid year or arid seasons, and distributed upwards in normal year or rain seasons. The turnover rate of underground biomass in extremely arid year was 52.64%, significantly higher than that in normal year (18.36%). In extremely arid year, underground part and aboveground part competed with each other at the middle and later stage of growth, however, in normal year, they increased simultaneously presenting beeline correlativity on the whole. The biomass ratio of underground to aboveground in extremely arid year was 11.19 and significantly higher than that in normal year (2.03). Net underground primary production in extremely arid year was 390.7 g穖^-2 穣r^-1. and 2.63 times higher than that in normal year.

Key words: Arid climate, Bothrichloa ischaemum community, Root system, Biomass

CLC Number:

S543.9

ZHANG Na, LIANG Yimi . Effect of arid climate on underground growth of Bothrichloa ischaemum community[J]. Chinese Journal of Applied Ecology, 2002, (7): 827-832.

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