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首页> 外文期刊>Soil Science and Plant Nutrition >Newly transplanted Larix olgensis Henry stock with greater root biomass has higher early nitrogen flux rate.
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Newly transplanted Larix olgensis Henry stock with greater root biomass has higher early nitrogen flux rate.

机译：根部生物量较大的新栽落叶松亨利种群具有较高的早期氮通量率。

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During the early time after transplanting, the ability of nitrogen (N) uptake in roots of tree stocks is crucial to their future performance. However, it is not clear about the relationship between size or nutrient reserves in nursery-cultured tree seedlings and root N flux (N flow within or out of root) after transplanting. In this study, we pre-fertilized Changbai larch (Larix olgensis Henry.) seedlings with three top-dress applications [N-phosphorus (P)-potassium (K), 20-4-10] at rates of 0 (control), 31.58 (E-Low), 200 (E-Medium), and 525.08 (E-High) kg N ha-1 to different levels of nutrient storage during the first growing season. After being graded into large and medium sizes, stock N status was indicated to be discriminative in response to pre-fertilization by vector analysis. Overwinter stocks were transplanted into aerated distilled water or nutrient solution to detect root N influx or N efflux, respectively, at the second and fourth weeks under laboratory conditions. Larger stocks had higher net N influx and efflux rates. In large stocks, N influx tended to increase within one month's time in the E-Medium and E-High treatments, whereas N efflux tended to rise as well. In pre-transplanted stocks, root biomass linearly correlated with both N influx and N efflux, but root N concentration only correlated with N influx for large stocks. In conclusion, proper nursery fertilization could induce seedling N reserves, which would result in a higher N influx rate for larger stocks, whose roots, however, would also risk more N efflux in humid but infertile sites during the early time after planting.
机译：在移植后的早期，树木砧木根部吸收氮（N）的能力对其未来的表现至关重要。然而，目前尚不清楚苗圃培育的树苗的大小或养分储备与移植后根氮通量（根内或根外氮流）之间的关系。在这项研究中，我们以0（对照）的比例对长白落叶松（Larix olgensis Henry。）的幼苗进行了三个施肥处理（N-磷（P）-钾（K），20-4-10），在生长的第一个季节中，分别以31.58（E-低），200（E-中）和525.08（E-High）kg N ha -1 kg不同的养分水平。在将其分为大中型后，通过矢量分析显示，对预施肥的反应表明储备N的状态是有区别的。在实验室条件下的第二周和第四周，将越冬种群移植到充气的蒸馏水或营养液中，分别检测氮的根流入量或氮的流出量。较大的股票有较高的净氮流入和外流率。在大型股票中，在E-媒介和E-High处理中，N流入在一个月的时间内趋于增加，而N流出也趋于上升。在预先移植的种群中，根生物量与氮流入和氮外流均呈线性相关，但对于大型种群，根氮浓度仅与氮流入相关。总之，适当的苗圃施肥可以诱导幼苗的氮储备，这将导致较大种群的较高氮素流入速率，但是，其根系在播种后的早期也会在潮湿但不育的地点冒出更多氮素的风险。

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