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首页> 外文期刊>Oecologia >The effect of Chinese tallow tree (Sapium sebiferum) ecotype on soil-plant system carbon and nitrogen processes
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The effect of Chinese tallow tree (Sapium sebiferum) ecotype on soil-plant system carbon and nitrogen processes

机译：牛脂树（Sapium sebiferum）生态型对土壤-植物系统碳氮过程的影响

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The EICA hypothesis predicts that shifts in allocation of invasive plants give rise to higher growth rates and lower herbivore defense levels in their introduced range than conspecifics in their native range. These changes in traits of invasive plants may also affect ecosystem processes. We conducted an outdoor pot experiment with Chinese tallow tree (Sapium sebiferum, Euphorbiaceae) seedlings from its native (Jiangsu, China, native ecotype) and introduced ranges (Texas, USA, invasive ecotype) to compare their relative performances in its native range and to examine ecotype effects on soil processes with and without fertilization. Consistent with predictions, plant (shoot and root) mass was significantly greater and leaf defoliation tended to be higher, while the root:shoot ratio was lower for the invasive ecotype relative to the native ecotype. Seasonal amounts of soil-plant system CO2 and N2O emissions were higher for the invasive ecotype than for the native ecotype. Soil respiration rates and N2O emission increases from fertilization were also greater for the invasive ecotype than for the native ecotype, while shoot-specific respiration rates (g CO2-C g(-1) C day(-1)) did not differ between ecotypes. Further, soil inorganic N (ammonium and nitrate) was higher, but soil total N was lower for soils with the invasive ecotype than soils with the native ecotype. Compared with native ecotypes, therefore, invasive ecotypes may have developed a competition advantage in accelerating soil processes and promoting more nitrogen uptake through soil-plant direct interaction. The results of this study suggest that soil and ecosystem processes accelerated by variation in traits of invasive plants may have implications for their invasiveness.
机译：EICA假说预测，在入侵范围内，入侵植物的分布变化会比其自然范围内的同种异种引起更高的生长速率和更低的草食动物防御水平。入侵植物性状的这些变化也可能影响生态系统过程。我们对来自其本土（江苏，中国，原生生态型）的牛脂树（Sapium sebiferum，大戟科）幼苗进行了室外盆栽试验，并介绍了其范围（德克萨斯州，美国，侵入性生态型），以比较它们在其本土范围内和研究有无施肥对土壤过程的生态型影响。与预测一致，入侵型生态型植物（枝和根）的质量明显更大，叶片的脱叶趋向于较高，而入侵型生态型的根：枝比相对于原生型生态型低。侵入性生态型的土壤-植物系统CO2和N2O排放的季节性量高于原生生态型。侵入性生态型的土壤呼吸速率和施肥引起的N2O排放增加也大于原生生态型，而专一性呼吸速率（g CO2-C g（-1）C day（-1））在不同生态型之间没有差异。此外，侵入性生态型土壤的无机无机氮（铵和硝酸盐）较高，但土壤总氮却低于天然生态型土壤。因此，与原生生态型相比，侵入性生态型在加速土壤过程和通过土壤－植物直接相互作用促进更多的氮吸收方面可能具有竞争优势。这项研究的结果表明，由于入侵植物性状的变化而加速的土壤和生态系统过程可能对其入侵具有影响。

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