| Comparison of growth adaptability of native Bothriochloa ischaemum and introduced Panicum virgatum was conducted in hilly region of Loess Plateau. A significant difference was found in soil moisture, aerial and root growth of both pastures, among which there was a decreased order of mean soil moisture as B. ischaemum in terrace(17.95%)> P. virgatum in terrace(16.02%)>B. ischaemum in sloping field(13.82%)>P. virgatum in sloping field(12.95%). In terraces the aerial biomass of B. ischaemum was higher than that of P. virgatum significantly, which was contrast with aerial biomass comparison in sloping field of both. However aerial biomass of both in sloping field was greater than that of terrace. Both pastures distributed their roots in soil of 020 cm mainly. The total root biomass would show a increasing trend from B. ischaemum in sloping field to B. ischaemum in terrace to P. virgatum in sloping field to P. virgatum in terrace. Meanwhile the aerial biomass surpassed the root biomass in four plant communities named as B. ischaemum in terrace, B. ischaemum in sloping field, P. virgatum in terrace and P. virgatum in sloping field with root-top rates of 0.1017, 0.0463, 0.2531 and 0.1091 respectively. From the relationship analysis B. ischaemum community was connected with the hilly habitats significantly. However P. virgatum showed a significant renovation in the hilly level. In both pastures communities significant relationships were built up for root biomass and soil depth, root biomass and soil moisture from which the maximum theory depth of 175.24, 92.30, 82.88, 90.55 cm were discovered respectively in roots length of B. ischaemum in terrace, B. ischaemum in sloping field, P. virgatum in terrace and P. virgatum in sloping field from the model functions. |