中文摘要：

通过大田试验,在高、中、低供水水平和根系部分分隔（尼龙网隔根）、完全分隔（塑料布隔根）、不分隔条件下,探讨玉米间作豌豆的产量和水分利用特征,以期为通过调控根间作用提高间作水分利用效率（WUE）提供依据。结果表明,9个间作处理的LER处于1.13～1.42,即间作较单作具有明显的产量优势。两种作物地上互作对间作产量的贡献率为15.7%～17.2%,根系空间生态位重叠对产量的贡献率占0.9%～3.4%,地下互作对间作增产的贡献率为82.6%～86.1%,供水水平相对较高时利于间作优势的发挥。玉米间作豌豆耗水量较相应单作高24.8%～28.8%。供水水平较低且存在作物生长带间水分迁移时,根系空间生态位重叠有利于降低群体耗水量。间作WUE较单作平均高27.5%～38.3%,高供水间作处理的WUE高于中、低灌水处理。无论是完全隔根还是部分隔根,间作WUE较未隔根处理显著下降,且尼龙网隔根间作的WUE最低。间作作物地下水分的带间迁移、根系空间生态位的适度重叠是提高作物WUE的重要途径。

英文摘要：

The field experiment was carried out under 3root partition patterns（no barrier,separated by nylon mesh,separated by plastic film）and 3irrigation quotas（high,medium,low）in maize pea intercropping systems,the purpose of the study is to determine the influence of root interaction on yield performance and water use characteristics of intercropping,and provide theoretical basis for improving WUE of intercropping.Results show that,the land equivalent ratio（LER）of all the maize/pea intercropping treatments are higher than 1,regardless of roots partition and irrigation levels,this means compared to sole cropping maize and pea,all the tested intercropping systems have yields advantage.In terms of contribution to yield of intercropping,the above-ground interaction between maize and pea takes account about 15.7%-17.2%,and the percentage of roots space niche overlap is0.9%-3.4%.In the same time,about 82.6%-86.1%of yield advantage in intercropping is originated from below- ground interaction,the higher irrigation quota is applied the higher yield advantage will gain.Compared water use（WU）of intercropping with corresponding sole maize and pea,it is24.8%-28.8% higher than the sole ones;while the irrigation quota is low and water transfer be-tween different planting belt is existed,the space niche overlap of roots is helpful to decrease WU of intercropping.Intercropping increases WUE of maize and pea by 27.5%-38.3% compared with the average of sole cropping crops,and WUE of intercropping with high irrigation quota is significantly higher than that of the treatments with medium or low water;on the hand,roots partition decreases WUE of intercropping significantly,and the intercropping with nylon mesh root barrier gets the lowest WUE.It is concluded that,water transfer between different planting belt,and a suitable roots space niche overlap are useful practices to increasing WUE of intercropping system.