中文摘要：

以体积分数为0.2％、1.0％、5.0％的叶、根及根际土壤水提液水培看麦娘,测定了弱化感小麦抗10103、强化感小麦115/青海麦和92L89对看麦娘发根力的影响.结果表明,小麦叶、根及根际土壤水提液对看麦娘的发根力均具显著的抑制作用,抑制率随水提液体积分数提高而增大,不同小麦品种间存在显著差异,抑制效应大小：115/青海麦＞92L89＞抗10103,抑制效应115/青海麦最大,抗10103最小.不同体积分数的115/青海麦叶水提液对看麦娘根系根重、根数、根长、总根长抑制率分别为64.6％-78.2％、37.2％-42.7％、57.5％-77.4％、73.0％-85.6％,根水提液的抑制率为40.4％-67.8％、34.1％-36.0％、43.4％-50.0％、63.2％-68.2％,根际土壤水提液的抑制率分别为65.9％-69.6％、31.7％-37.2％、37.7％-48.1％、57.7％-69.1％;抗10103叶水提液处理的抑制率分别为54.0％-62.8％、29.3％-30.5％、57.5％-77.4％、63.2％-80.2％,根的抑制率分别为21.2％-49.2％、19.5％-26.8％、34.0％-47.2％、47.6％-61.2％,根际土壤的抑制率分别为10.6％-25.5％、4.3％-19.5％、30.2％-33.0％、33.6％-44.6％.强化感小麦对看麦娘的发根力具有较强的抑制效应.

英文摘要：

In order to explore the mechanism of weed suppression effect by allelopathic wheat, rooting abilities of Alopecurus aequalis were detenTfined in a set of hydroponic culture experiments. Water extracts from leaves, roots and rhizospheric soils of weak aUelo- pathic wheat 10103, strong aUelopathic wheat 115/Qinghai and 92L89 were applied in the hydroponic solutions, and the treated vol- ume fractions were 0.2%, 1.0% and 5.0%. The results showed that water extracts from haves, roots and rhizesphefic soils of the different wheat varieties performed significant suppression effects on rooting abilities of Alopecurus aequalis, and the inhibitory rates （IR） inereased with treated volume fraction. The IRa of rooting abilities differed among wheat accessions, showing in the order of 115/Qinghai 〉92L89 〉 Kang 10103, the highest IR was observed in wheat ll5/Qinghai and the lowest one was Kang 10103. For ll5/Qinghai, the IRa of root fresh weight, root number, root length and total root length to A/opecurus aequa//s by the leaves water extracts varied from 64.6% to 78.2%, 37.2% to 42.7%, 54.7% to 73.6% and 73.0% to 85.6%, respectively. They were from 40.4% to67.8%, 34.1% to 36.0%,39.6% to 66.0%, 63.2% to 68.2% by their root tissues extracts, and from 65.9% to 69.6%, 31.7 % to 37.2%, 34.9% to 48.1%, 57.7 % to 69.1% by rhizospheric soils extracts. While, the IRa by the leaves aque- ous extracts of Kang 10103 varied from 54.0% to 62.8%, 29.3% to 30.5%, 57.5% to 77.4% and 63.2% to 80.2%, respective- ly, and they were from 21.2% to 49.2%, 19.5% to 26.8%, 34.0% to 47.2% and 47.6% to 61.2% by their root tissues extracts, and from 10.6% to 25.5%, 4.3% to 19.5%, 30.2% to 33.0% and 33.6% to 44.6% by thizospheric soils extracts. Higher inhi- bition effect on rooting ability of Alopecurus aequalis was observed in strong alhlopathic wheat accessions.