水肥耦合对‘聊红’椿幼苗生长特性的影响

Water and Fertilizer Coupling on Growth Characteristics of Ailanthus altissima'Liaohong'Seedlings

为探究水肥耦合对‘聊红’椿幼苗生长特性的影响,采用双因素正交试验设计,分析不同灌水量(田间持水量的30%~40%,W1、50%~60%,W2、70%~80%,W3)和N-P_(2)O_(5)-K_(2)O施用量(0-0-0 g/株,F0、2-1-1.5 g/株,F1、4-2-3 g/株,F2、6-3-4.5 g/株,F3)组合对‘聊红’椿幼苗株高、地径、叶面积、叶片数及生物量分配等生长指标的影响。结果表明:水分处理和施肥处理对各生长指标均有极显著影响,水肥耦合对试验后期的株高、地径、茎、细根和粗根生物量有显著影响。W2F2处理对株高、地径和叶片生长的促进作用最明显。‘聊红’椿的总生物量在W2F2处理下取得最大值,F3处理的肥料水平会降低各部位的生物量。W2F2处理下‘聊红’椿的根冠比、体积指数和Dickson质量指数均为最大值,且显著高于其他处理。W1F0处理下的高径比最小。因此,在不同水肥组合中W2F2处理为最佳组合,显著促进‘聊红’椿幼苗的生长和生物量积累。

In order to explore the effects of water-fertilizer coupling on the growth characteristics of Ailanthus altissima'Liaohong',the two-factor orthogonal experimental design was used to analyze the effects of different irrigation amounts(30%~40%of the field water holding capacity,W1,50%~60%,W2,70%~80%,and W3)and N-P_(2)O_(5)-K_(2)O application amounts(0-0-0 g/plant.F0,2-1-1.5 g/plant,F1,4-2-3 g/plant,F2,6-3-4.5 g/plant,F3)combinations on growth indexes such as plant height,ground diameter,leaf area,leaf number and biomass allocation of A.altissima'Liaohong'seedlings.The results showed that water and fertilizer treatments had highly significant effects on all growth indexes,and the waterfertilizer coupling had significant effects on plant height,ground diameter,stem,fine and coarse root biomass at the later stage of the experiment.The W2F2 treatment had the most obvious promotional effect on plant height,ground diameter and leaf growth.The total biomass of A.altissima'Liaohong'achieved the maximum value under W2F2 treatment,and the fertilizer level of F3 treatment reduced the biomass of each part.The root-crown ratio,volume index,and Dickson quality index of A.altissima'Liaohong'under W2F2 treatment were all maximum and significantly higher than other treatments.The height to diameter ratio was minimum under W1F0 treatment.Therefore,the best combination among the different waterfertilizer combinations was the W2F2 treatment,which significantly promoted the growth and biomass accumulation of A.altissima'Liaohong'seedlings.