北川山区海拔和坡向对杂交玉米的影响

EFFECT OF ALTITUDE AND MOUNTAIN SLOPE ASPECT ON HYBRID CORN IN BEICHUAN COUNTY

在 φ(N) 31°45′～ 31°5 0′,λ(E) 10 4°2 0′～ 10 4°2 5′范围内 ,通过 3个杂交玉米品种在海拔 (halt) 6 0 0、90 0、12 0 0和 15 0 0m的阳坡和阴坡试验表明 :(1)海拔对杂交玉米的产量有极显著的影响 .在halt6 0 0～ 15 0 0m范围内 ,每升高 10 0m ,杂交玉米株高降抵 2 .4cm ,生育期延长 4.0d .(2 )坡向对杂交玉米产量也有极显著的影响 .与阳坡相比 ,阴坡使杂交玉米株高增加 3.9cm ,生育期延长 3.2d ,产量降低 35 2 .1kghm-2 .(3)海拔与品种的互作效应显著 ,但海拔与坡向之间、坡向与品种之间的互作效应不显著 ,并且海拔、坡向和品种三因素之间的交互作用对杂交玉米产量也没有显著影响 .认为本研究结果可为山区杂交玉米的品种布局和高产栽培提供理论依据 .表 3参

Experiments were conducted with 3 hybrid corn varieties in 8 sites on sunny and shadow slopes at altitude of 600 m,900 m,1 200 m, and 1 500 m above sea level. As altitude rose per 100 m, plant height of hybrid corn was decreased by 2.4 cm and growth period was delayed by 4.0 d. Furthermore, there were highly significant differences in hybrid corn yields between the sunny and slopes. Compared with those on the sunny slope, the plant height was increased by 3.9 cm, the growth period was delayed by 3.2 d and the yield was reduced by 352.1 kg hm -2 on the shadow slope. The interaction between altitude and variety was significant. However, the interactions between altitude and slope aspect, slope aspect and variety, and among altitude, slope aspect and variety were not observed in in the yield of hybrid corn. This study provides a basis for the layout and cultivation of hybrid corn in mountain areas. Tab 3, Ref 10