Plasticity of Plant N Uptake in Two Native Species in Response to Invasive Species
Plasticity of Plant N Uptake in Two Native Species in Response to Invasive Species
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两种本地物种植物氮吸收对入侵物种反应的可塑性
DOI：
10.3390/f10121075
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发表时间：
2019-12-01
期刊：
影响因子：
2.9
通讯作者：
Xu, Xing-Liang
中科院分区：
文献类型：
--
作者：
Hu, Yi-Heng;Zhou, Yu-Lu;Xu, Xing-Liang
由于营养限制而引起的生存竞争在入侵植物和本地植物之间往往很激烈。植物入侵对植物生长中养分吸收的影响在很大程度上仍不清楚。阐明入侵植物如何影响当地人的氮吸收将提供更好地了解植物入侵的机制。用15 N标记法对两种常见的入侵植物空心莲子草（Alternanthera philoxeroides（Mart.）葛瑞瑟布和三裂叶婆婆纳（Wedelia trilobata（L.）Hitchc.）和它们的原生同源物（A. sessilis（L.）DC.和W. chinensis（Osbeck.）梅尔）研究它们在单一培养物和混合培养物中生长时对NH 4+、NO3−和甘氨酸的吸收。所有植物在温室中生长70天用于标记和生物量测量。影响四种植物氮素吸收的主要因素是氮素的形态，而不是物种的特性。在所有物种中，最多的N以NH 4+的形式吸收，其次是NO3−和甘氨酸。这两个入侵物种增长速度更快，稳定的N-吸收模式，尽管更温和的N比本地物种的吸收率。本地物种受到入侵物种的强烈影响。入侵物种的存在导致本地人的N-吸收率降低，改变N-吸收模式，但并没有实质性地改变他们的增长率。本地物种减少了他们的N-吸收率，但增加了N-利用效率，通过改变N-吸收模式中存在的入侵植物。这种灵活的氮吸收模式可能是一个重要的生存策略，为本地植物与入侵者的竞争。
Survival competition caused by limiting nutrients is often strong between invasive and native plant species. The effects of plant invasion on nutrient uptake in plant growth remain largely unclear. Clarifying how invasive plants affect N uptake by natives will provide a better understanding on mechanisms responsible for plant invasion. A 15N-labeling experiment was conducted using two common invasive species (Alternanthera philoxeroides (Mart.) Griseb. and Wedelia trilobata (L.) Hitchc.) and their native congeners (A. sessilis (L.) DC. and W. chinensis (Osbeck.) Merr.) to examine their growth and uptake of NH4+, NO3−, and glycine when grown in monocultures and mixed cultures. All plants were grown in a greenhouse for 70 days for labelling and biomass measurements. The main factor affecting N uptake by the four species was the form of N, rather than species identity. In all of the species, the most N was taken up in the form of NH4+, followed by NO3− and glycine. The two invasive species grew faster, with stable N-uptake patterns despite more moderate uptake rates of N than the native species. Native species were strongly affected by the invasive species. The presence of invasive species caused the N-uptake rates of the natives to be reduced, with altered N-uptake patterns, but did not substantially alter their growth rates. Native species reduced their N-uptake rates but increased N-use efficiency through altering N-uptake patterns in the presence of invasive plants. Such a flexible N-uptake pattern could be an important survival strategy for native plants in competition with invaders.