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为了研究水氮耦合对于小桐子生长和灌溉水利用效率的影响,采用3个供水水平(W1,15.3mm;W2,25.5mm;W3,40.7mm)和3个施氮水平(N1,0g·kg-1;N2,0.3g·kg-1;N3,0.6g·kg-1)进行盆栽实验。结果表明:与W3相比,W1和W2处理的株高、茎粗、叶面积和总干物质量分别降低了61%和34%、57%和35%、46%和32%、49%和35%,根冠比在W2处理时达到最大值;对不同氮素处理,株高和叶面积最大值均出现在N2处理,而茎粗和根冠比则随着施氮量的增加而减小;与W3N3相比,W2N2处理节省灌溉用水38%,节约氮肥施用量50%,其株高、茎粗和总干物质量分别减少了12%、21%和12%,根冠比和叶面积分别显著增加了48%和16%,灌水后第2天、第3天和第4天的蒸腾量分别显著降低21%、15%和12%,从而使灌溉水利用效率提高了40%。
In order to study the effects of water and nitrogen coupling on the growth and irrigation water use efficiency of Jatropha curcas, three water supply levels (W1, 15.3 mm; W2, 25.5 mm; W3, 40.7 mm) and three nitrogen levels (N1, -1; N2, 0.3g · kg-1; N3,0.6g · kg-1). The results showed that the plant height, stem diameter, leaf area and total dry matter of W1 and W2 treatments decreased by 61% and 34%, 57% and 35%, 46% and 32%, 49% and 35% respectively compared with W3 %, And the ratio of root to shoot reached the maximum at W2 treatment. The highest values of plant height and leaf area appeared in N2 treatment, but the stem and root / shoot ratio decreased with the increase of N application rate Compared with W3N3, the W2N2 treatment saved 38% of irrigation water and saved 50% of nitrogen fertilizer, and the plant height, stem diameter and total dry matter were reduced by 12%, 21% and 12%, respectively. Significantly increased by 48% and 16% respectively. After transplanting, the transpiration amount decreased by 21%, 15% and 12% on the second, the third and the fourth days after irrigation, respectively, resulting in an increase of 40% of irrigation water use efficiency.