Nitrogen Deposition Effects on Invasive and Native Plant Competition: Implications for Future Invasions
Nitrogen Deposition Effects on Invasive and Native Plant Competition: Implications for Future Invasions
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DOI：
10.1016/j.ecoenv.2023.115029
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发表时间：
2023-05-20
影响因子：
6.8
通讯作者：
Li, Ming-Yan
中科院分区：
文献类型：
--
作者：
Guo, Xiao;Hu, Yi;Li, Ming-Yan
近几十年来，氮沉降急剧增加，对外来植物的入侵和生长产生了重要影响。氮沉降是否会导致外来入侵物种的竞争上级，仍有待研究。本研究以入侵种月见草（Oenothera biennis L.）和三个共存的本地物种（Artemisia argyi Le ' vl.）等Vant。，旋覆花，和Chenopodium album L.）采用单种栽培（同一种的两株幼苗）或混合栽培（一株O.在3个氮沉降水平（0、6和12 g中心点m（-2）中心点年（-1））下，本种幼苗和一株本地种幼苗的生长均受到影响。氮沉降对土壤N、P含量无明显影响。氮沉降增加了入侵植物和本地植物的冠幅面积、总生物量、叶片叶绿素含量和叶片氮磷比。月见草（Oenotherabiennis）在与C.专辑和我粳稻的优势在于其较高的资源获取和吸收能力（较高的株高、冠幅、叶片叶绿素a/叶绿素B比、叶片叶绿素含量、叶片氮含量、叶片质量分数和较低的根冠比）。而本地种A. argyi表现出与O.再见因此，入侵物种并不总是本地物种的上级竞争者;这取决于本地物种的身份。高氮沉降增强了O.比恩尼斯岛japonica的竞争优势降低了15.45%，但没有改变O. biennis over C.专辑此外，氮沉降并不影响O的优势。biennis或A.艾。因此，在准备抵御未来生物入侵时，必须考虑原生群落的物种组成。本研究有助于更好地理解氮负荷条件下外来物种的入侵机制。
Nitrogen (N) deposition has increased dramatically in recent decades, which is significantly affecting the inva-sion and growth of exotic plants. Whether N deposition leads to invasive alien species becoming competitively superior to native species remains to be investigated. In the present study, an invasive species (Oenothera biennis L.) and three co-occurring native species (Artemisia argyi Le ' vl. et Vant., Inula japonica Thunb., and Chenopodium album L.) were grown in a monoculture (two seedlings of the same species) or mixed culture (one seedling of O. biennis and one seedling of a native species) under three levels of N deposition (0, 6, and 12 g center dot m(-2)center dot year(-1)). Nitrogen deposition had no effect on soil N and P content. Nitrogen deposition enhanced the crown area, total biomass, leaf chlorophyll content, and leaf N to phosphorus ratio in both invasive and native plants. Oenothera biennis dominated competition with C. album and I. japonica due to its high resource acquisition and absorption capacity (greater height, canopy, leaf chlorophyll a to chlorophyll b ratio, leaf chlorophyll content, leaf N content, leaf mass fraction, and lower root-to-shoot ratio). However, the native species A. argyi exhibited competitive ability similar to O. biennis. Thus, invasive species are not always superior competitors of native species; this depends on the identities of the native species. High N deposition enhanced the competitive dominance of O. biennis over I. japonica by 15.45% but did not alter the competitive dominance of O. biennis over C. album. Furthermore, N deposition did not affect the dominance of O. biennis or A. argyi. Therefore, the species composition of the native community must be considered when preparing to resist future biological invasions. Our study contributes to a better understanding of the invasion mechanisms of alien species under N-loading conditions.