中文摘要：

探讨分根区灌溉和氮肥对盆栽星油藤幼苗生长的影响。试验设置3个因素,灌水量、灌溉方式和氮肥,共7个处理,测量了幼苗生长、光合和水分利用效率等指标。结果表明：与充分灌溉相比,分根区灌溉的处理,生物量降低5%,节水75%,水分利用率高出60%,表现出极大的节水效益。重度干旱条件下,施氮肥的处理,根冠比增加达30%,但分根区灌溉处理叶面积指数下降38%,光合速率下降9%,生物量下降18%,分根区灌溉在严重干旱条件不适宜施氮肥。总之,在适度干旱条件下,分根区灌溉降低蒸腾,提高水分利用率,是一种有效的节水灌溉技术。

英文摘要：

This study was aimed to investigate the effects of alternative partial rootzone irrigation and nitrogen fertilizer on the potted seedlings of Plukenetia volubilis.A total of 7 treatments were designed with three factors, i.e., irrigation amount, irrigation mode and nitrogen fertilizer. The growth, photosynthesis and water use efficiency were analyzed. The results showed that compared with those under full irrigation, the biomass and water consumption under alternative partial root-zone irrigation were reduced by 5% and 75%, respectively, and the water use efficiency was increased by 60%. Under severe drought conditions, the root cap ratio in the nitrogen fertilizer treatment group was increased by 30%; the leaf area index, photosynthetic rate and biomass under alternative partial root-zone irrigation were reduced by 38%, 9% and 18%, respectively. It indicates that under severe drought conditions, alternative partial root-zone irrigation is not suitable to be matched with application of nitrogen fertilizer. In short, under moderate drought conditions, alternative partial root-zone irrigation could reduce transpiration and improve water use efficiency, and it is an effective water-saving irrigation technology for the plantation of P.volubilis plants.