作　　者： (贾林）; (李婕）; (杨启良）;

机构地区： 元谋大禹节水有限责任公司,云南元谋651300

出　　处： 《节水灌溉》 2017年第8期69-72,76,共5页

摘　　要： 为了研究不同灌溉施氮模式对麻风树水氮利用的影响,采用4种供水水平[T1:100%ET(ET为蒸散量);T2:80%ET;T3:60%ET;T4:40%ET]和3种施氮水平(N1:0 g/kg;N2:0.4 g/kg;N3:0.8 g/kg)。结果表明:根区土壤硝态氮质量分数差值表现为T2>T3>T1>T4。与高水高氮的T1N3相比,T2N2处理节水20%,节约氮肥用量50%,其灌溉水利用效率提高了26%,氮素吸收表观利用率及氮素吸收效率分别提高149%、26%。水分利用效率和氮素吸收效率均与施氮量呈显著二次曲线关系,均在低氮水平下达到最大值。因此,有利于麻风树生长和水氮高效利用的最优灌溉施氮模式是灌水周期为7 d,每次灌水量为80%ET,每千克风干土施氮0.4 g的处理。 in order to provide a theoretical with different irrigation with fertilization treatments to support for improving water and nitrate- nitrogen use efficiency of Jatropha curcas L. Four watering levels [ T1 ： 100% ET（ ET： Evapo-transpiration）, T2 ： 80% ET, T3 ： 60%ET, T4 ： 40%ET] and three nitrogen fertilization levels （N 1：0 g/kg, N2：0.4 g/kg, N3：0.8 g/kg） were designed. Test results showed that： From the difference between the two soil nitrate nitrogen mass fraction, it showed T2〉T3〉TI〉T4. Compared with T1N3, T2N2 saved 20% of irrigation water, saved 50% of nitrogen fertilizer dosage, the water use efficiency increased by 26% and the N apparent recovery fraction and N uptake efficiency were increased by 149% and 26%, respectively. Water use efficiency and nitrogen absorption efficiency showed two curve relationship with nitrogen application rate, and reached the maximum at low nitrogen level. So the treatment of T2N2 is more favorable to the absorption of nitrogen fertilizer.

关 键 词： 灌溉施氮 麻风树 氮素吸收 水氮利用效率