[topographical and pedological factors adapted to the growth of domestic truffles (tuber indicum)]. | topographical and pedological factors at 9 sites of tuber indicum in yunnan, sichuan and tibet were studied by using principal component analysis in order to determine the connection between truffle-growth with topographic factors and soil factors. results showed that: 1) the 5 principal components selected from 15 topographical and pedological factors had a great cumulative contribution, up to 87.5%. among the topographical factors, the slope position was the most important ecological factor af ... | 2015 | 26572034 |