CAJ | 학술논문

为探索不同施肥方式及施用量对米老排（ Mytilaria laosensis Lecomte）苗期生长动态的影响，确定其苗期施肥的最佳供氮方式及水平，采用等量施肥（C）、阶段递增施肥（A）和修正指数施肥（ME）3种方式，以0 mg·株－1为对照，分别设置50、100、200、400、600 mg·株－15个氮素水平开展米老排幼苗盆栽试验。结果表明：3种方式下中低剂量施肥有利于米老排后期生物量积累，高剂量施肥导致其积累停滞或下降。低剂量修正指数施肥（50 ME和100 ME），苗高在整个试验期间保持“J”型高速增长状态，地径呈直线式生长；其他处理苗木在苗高、地径生长和生物量积累上均因后期施肥不足或肥料积累而较前期生长有不同程度减缓。此外，所有施肥处理在不同程度上提高了收获时米老排的苗高、地径和总生物量，其中100 C的苗高达到最大（44．4 cm），是对照的259．0％；200 C的苗木地径（3．92 mm）、生物量（4．75 g·株－1）均为最大，分别是对照的142．5％、360．6％；200 C的质量指数最大，其次是100 ME和50 ME。综合上述形态指标评价研究结果得出，米老排苗期最佳供氮方式为等量施肥法，最佳供氮水平为200 mg·株－1。
위탐색불동시비방식급시용량대미로배（ Mytilaria laosensis Lecomte）묘기생장동태적영향，학정기묘기시비적최가공담방식급수평，채용등량시비（C）、계단체증시비（A）화수정지수시비（ME）3충방식，이0 mg·주－1위대조，분별설치50、100、200、400、600 mg·주－15개담소수평개전미로배유묘분재시험。결과표명：3충방식하중저제량시비유리우미로배후기생물량적루，고제량시비도치기적루정체혹하강。저제량수정지수시비（50 ME화100 ME），묘고재정개시험기간보지“J”형고속증장상태，지경정직선식생장；기타처리묘목재묘고、지경생장화생물량적루상균인후기시비불족혹비료적루이교전기생장유불동정도감완。차외，소유시비처리재불동정도상제고료수획시미로배적묘고、지경화총생물량，기중100 C적묘고체도최대（44．4 cm），시대조적259．0％；200 C적묘목지경（3．92 mm）、생물량（4．75 g·주－1）균위최대，분별시대조적142．5％、360．6％；200 C적질량지수최대，기차시100 ME화50 ME。종합상술형태지표평개연구결과득출，미로배묘기최가공담방식위등량시비법，최가공담수평위200 mg·주－1。
A fertilization trial under three nitrogen loading regimes including conventional ( C) , phase-additional ( A) and modi-fied-exponential regime (ME) was conducted with five nitrogen levels (0, 50, 100, 200, 400 and 600 mg· seedling-1), 0 mg· seedling-1 severing as the control to study the effects on growth dynamic of Mytilaria laosensis seedlings and deter-mine the optimal nitrogen loading regime and amount .The fertilization of low doses under three regimes benefited the bio-mass accumulation for M.laosensis in late growth season, while retardation or decline of biomass accumulation was caused by fertilizing of high dose .Seedlings treated with 50 ME and 100 ME remained rapid height growth during the whole experi-ment, showing a “J” shape growth curve , and diameter was on a linear growth curve .Seedlings with residual treatments were observed and decreased in seedling height , ground diameter and total biomass accumulation due to insufficient or ex-cess fertilization compared with the early stage .In addition , fertilization treatments improved all the measurement parame-ters of seedlings at harvest , of which seedlings height treated with 100 C reached the maximum of 44.4 cm and was 259.0%of the control, and the maximum ground diameter (3.92 mm) and biomass (19.00 g· seedling-1) of 200 C were 142.5%and 360.6%of the control , respectively .Seedling of 200 C reached the highest in the quality index , followed by 100 ME and 50 ME.By a comprehensive evaluation of morphological indices , the optimal nitrogen loading regime and amount was 200 mg· seedling-1 under conventional fertilization .