Preliminary study on path coefficient between growth traits and seed yield of Bromus cartharticus in alpine mountains

The correlation and path coefficient analysis between plant traits and seed yield of the natural succession of wild Bromus cartharticus in alpine mountains were studied based on calculation of determination coefficient and the result showed the it was d= 0.957 6, and this indicated that the main components affecting seed yield had been included. The rate of fruit ripening, seed number per inflorescence and thousand seed weight were the main traits affecting seed yield. The optical multiple regression could be described as y=-453.07+0.958 7x7 (seed number per inflorescence)+0.342 7x8 (thousand seed weight)+0.510 5x9(rate of fruit ripening). So the effective way to increase the seed yield is to improve the rate of fruit ripening, seed of inflorescence and thousand seed weight.