Nitrogen use strategies of neotropical rainforest trees in threatened Atlantic Forest
Nitrogen use strategies of neotropical rainforest trees in threatened Atlantic Forest
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DOI：
10.1046/j.1365-3040.2003.00970.x
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发表时间：
2003-03-01
影响因子：
7.3
通讯作者：
Joly, CA
中科院分区：
文献类型：
--
作者：
Aidar, MPM;Schmidt, S;Joly, CA
研究了巴西东南部钙质土壤上大西洋森林演替物种的氮获取、运输和同化特征。在再生公会内观察到了行为上的差异。先锋物种表现出高叶片氮含量、对土壤氮有效性增加的高反应能力、高叶片硝酸盐同化能力，并以硝酸盐+天冬酰胺的运输为特征。在演替的另一端，晚期次生物种的叶片氮含量低，对土壤氮有效性增加的反应能力小，叶片硝酸盐同化能力低，并且在天冬酰胺+精氨酸的运输中活跃。一些早期次生物种的氮营养特征与先锋物种相似，而另一些则更类似于晚期次生物种。平均叶δ(15)N值沿着演替梯度增加。结果表明，物种的氮代谢特征可能是将热带森林树种分类为生态群的额外生态生理学工具，并且可能对退化地区的再生计划产生影响。
The characteristics of nitrogen acquisition, transport and assimilation were investigated in species of an Atlantic Forest succession over calcareous soil in south-eastern Brazil. Differences in behaviour were observed within the regeneration guilds. Pioneer species showed high leaf nitrogen contents, a high capacity to respond to increased soil nitrogen availability, a high capacity for leaf nitrate assimilation and were characterized by the transport of nitrate + asparagine. At the other end of the succession, late secondary species had low leaf nitrogen contents, little capacity to respond to increased soil nitrogen availability, low leaf nitrate assimilation and were active in the transport of asparagine + arginine. The characteristics of nitrogen nutrition in some early secondary species showed similarities to those of pioneer species whereas others more closely resembled late secondary species. Average leaf delta(15)N values increased along the successional gradient. The results indicate that the nitrogen metabolism characteristics of species may be an additional ecophysiological tool in classifying tropical forest tree species into ecological guilds, and may have implications for regeneration programmes in degraded areas.