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首页> 外文期刊>Plant and Soil >Foliar free polyamine and inorganic ion content in relation to soil andsoil solution chemistry in two fertilized forest stands at the HarvardForest, Massachusetts
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Foliar free polyamine and inorganic ion content in relation to soil andsoil solution chemistry in two fertilized forest stands at the HarvardForest, Massachusetts

机译：马萨诸塞州哈佛森林的两个施肥林中的叶面游离多胺和无机离子含量与土壤和土壤溶液化学的关系

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Polyamines (putrescine, spermidine, and spermine) are low molecular weight, open-chained, organic polycations which are found in all organisms and have been linked with stress responses in plants. The objectives of our study were to investigate the effects of chronic N additions to pine and hardwood stands at Harvard Forest, Petersham, MA on foliar polyamine and inorganic ion contents as well as soil and soil solution chemistry. Four treatment plots were established within each stand in 1988: control, low N (50 kg N ha(-1) yr(-1) as NH4NO3), low N + sulfur (74 kg S ha(-1) yr(-1) as Na2SO4), and high N (150 kg N ha(-1) yr(-1) as NH4NO3). All samples were analyzed for inorganic elements; foliage samples were also analyzed for polyamines and total N. In the pine stand putrescine and total N levels in the foliage were significantly higher for all N treatments as compared to the control plot. Total N content was positively correlated with polyamines in the needles (P less than or equal to 0.05). Both putrescine and N contents were also negatively correlated with most exchangeable cations and total elements in organic soil horizons and positively correlated with Ca and Mg in the soil solution (P less than or equal to 0.05). In the hardwood stand, putrescine and total N levels in the foliage were significantly higher for the high N treatment only as compared to the control plot. Here also, total foliar N content was positively correlated with polyamines (P less than or equal to 0.05). Unlike the case with the pine stand, in the hardwood stand foliar polyamines and N were significantly and negatively correlated with foliar total Ca, Mg, and Mn (P less than or equal to 0.05). Additional significant (P less than or equal to 0.05) relationships in hardwoods included: negative correlations between foliar polyamines and N content to exchangeable K and P and total P in the organic soil horizon; and positive correlations between foliar polyamines and N content to Mg in soil solution. With few exceptions, low N + S treatment had effects similar to the ones observed with low N alone for both stands. The changes observed in the pine stand for polyamine metabolism, N uptake, and element leaching from the soil into the soil solution in all treatment plots provide additional evidence that the pine stand is more nitrogen saturated than the hardwood stand. These results also indicate that the long-term addition of N to these stands has species specific and/or site specific effects that may in part be explained by the different land use histories of the two stands.
机译：多胺（腐胺，亚精胺和亚精胺）是一种低分子量，开链的有机聚阳离子，存在于所有生物中，并与植物的胁迫反应有关。我们研究的目的是调查在马萨诸塞州彼得舍姆市哈佛森林的松树和阔叶林中长期添加氮对叶面多胺和无机离子含量以及土壤和土壤溶液化学的影响。 1988年在每个林分内建立了四个处理区：对照，低氮（50 kg N ha（-1）yr（-1）为NH4NO3），低氮+硫（74 kg S ha（-1）yr（-1） ）（Na2SO4）和高氮（150 kg N ha（-1）yr（-1）作为NH4NO3）。分析所有样品中的无机元素。还分析了叶子样品中的多胺和总氮。在松林中，所有对照处理下的腐胺和腐殖酸和叶子中的总氮水平均显着高于对照样地。总氮含量与针中的多胺呈正相关（P小于或等于0.05）。腐胺和氮的含量也与有机土壤层中大多数可交换阳离子和总元素呈负相关，与土壤溶液中的钙和镁呈正相关（P小于或等于0.05）。在硬木林分中，仅高氮处理的叶子中的腐胺和总氮水平仅比对照样地高得多。同样，叶面总氮含量与多胺呈正相关（P小于或等于0.05）。与松林不同，硬木林中的叶面多胺和N与叶面总Ca，Mg和Mn呈显着负相关（P小于或等于0.05）。硬木中的其他显着（P小于或等于0.05）关系包括：叶面多胺与N含量与有机土壤层中可交换的K和P以及总P之间的负相关;和土壤溶液中叶面多胺与氮含量与镁的含量呈正相关。除少数例外，低N + S处理的效果与两个林分单独使用低N所观察到的效果相似。在所有处理区，松树架上观察到的多胺代谢，氮吸收和元素从土壤浸出到土壤溶液中的浸出量的变化提供了更多证据，表明松树架比硬木架更富氮。这些结果还表明，长期向这些林分中添加N具有物种特异性和/或地点特有的影响，这在一定程度上可以由两个林分的不同土地利用历史来解释。

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