Nitrogen addition increases intraspecific competition in the invasive wetland plant <scp><i>Alternanthera philoxeroides</i></scp>, but not in its native congener <scp><i>Alternanthera sessilis</i></scp>

Wang, Ao; Jiang, Xingxing; Zhang, Qiu-Qiu; Zhou, Jian; Li, Hongli; Luo, Fang‐Li; Zhang, Mingxiang; Yu, Fei‐Hai

doi:10.1111/1442-1984.12048

Cited by 23 publications

(14 citation statements)

References 41 publications

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“…The quantity and frequency of N addition had a significant interactive effect on the total biomass and stem biomass of H. vulgaris. The results were consistent with a previous study [18]. Under low-quantity N addition, the total and stem biomass were significantly lower in the highcompared to the medium-and low-frequency N treatments.…”

Section: Effects Of N Addition Quantity and Frequency On The Growth Osupporting

confidence: 93%

“…We predict that the effect of N deposition frequency on plants may be mediated by the quantity of N deposition. For example, under the conditions of low N deposition, the biomass of Alternanthera sessilis was higher in high-, compared to low-frequency N deposition, respectively [18]. Furthermore, the influence on different plant species varies with N deposition frequency.…”

Section: Introductionmentioning

confidence: 96%

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Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Zhang

Gao

et al. 2019

Sustainability

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(1) Background: Increased attention has been paid to atmospheric nitrogen (N) deposition caused by human activities. N deposition quantity has seriously affected plant productivity and greenhouse gas emissions in wetlands, but the effects of N deposition frequency remain unclear. (2) Methods: We assembled microcosms, which contained vegetative individuals (ramets) of Hydrocotyle vulgaris and soil and subjected them to three frequencies (N addition 1, 2, and 14 times during the experimental period) crossed with three quantities (5, 15, and 30 g N m−2 yr−1) for 90 days. (3) Results: The quantity of N addition significantly increased the root, stem biomass, and ramets number of H. vulgaris, but decreased the spike biomass. N addition quantity significantly promoted N2O emission and inhibited CH4 emission but had no significant effect on CO2 emission. The increasing frequency of N addition significantly promoted the root-to-shoot ratio and decreased N2O emission under high N addition quantity. (4) Conclusions: In conclusion, N addition alters the reproductive strategy of H. vulgaris and enhances its invasiveness, promoting N2O emission but not the CO2 equivalent of the H. vulgaris-soil system.

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Section: Effects Of N Addition Quantity and Frequency On The Growth Osupporting

confidence: 93%

Section: Introductionmentioning

confidence: 96%

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Zhang

Gao

et al. 2019

Sustainability

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“…With the water depth fluctuation, there are other sources of stress that could affect the growth of target plants, such as nitrogen pulses, changed water content and low nutrients (Sun, Ding, & Ren, 2009;Wang et al, 2015). Zhang et al (2016) suggested that increasing concentration of nutrients promoted growth of invasive Alternanthera philoxeroides and alleviated the stress of submergence.…”

Section: Discussionmentioning

confidence: 99%

Fluctuated water depth with high nutrient concentrations promote the invasiveness ofWedelia trilobatain Wetland

Sun

Javed

Abdolzadeh

et al. 2019

Ecology and Evolution

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Invasion by plant species poses a serious threat to native ecosystems and causes considerable losses to economy. Invasive plants develop their monocultures and dominate the invaded ecosystems by excluding the co-occurring native plants. Accordingly, plant invasions alter structure of the native ecosystems in the wetlands. Numerous hypotheses have been projected to explain the success of invasions by the invasive plants (Daehler, 2003). Traits of invasive plant species have been investigated and compared in several studies in Abstract The distribution of invasive and native species in wetlands is determined by hydrological conditions; whereas conditions such as water depth fluctuations, variations in the nutrient concentrations are expected to affect the growth and physiological traits of plants. For the assessment of such effects, we conduct greenhouse experiment with three factors; 1) water depth of 5 cm and 15 cm (static and fluctuated); 2) three levels of nutrient concentrations (i) full-strength Hoagland solution (N1), (ii) ¼-strength Hoagland solution (N2), and (iii) 1 / 8 -strength Hoagland solution (N3); and 3) species, invasive Wedelia trilobata (L.) and its congener, native Wedelia chinensis (Osbeck.) under mono and mixed culture. Water depth of 5 cm combined with any of the nutrient treatments significantly restrained the photosynthesis, intracellular CO 2 concentration and leaf chlorophyll of both W. trilobata and W. chinensis.Increase in the water depth to 15 cm with low-nutrient treatment N3 did not sustain the physiological traits of W. chinensis under mono and mixed planting. A great loss was noted in the growth of W. chinensis at 15 cm static and fluctuated water depth with low-nutrient treatment (N3) and under mixed culture. In addition, water depth fluctuations with both low-and high-nutrient treatments significantly affected the root-shoot ratio, relative growth rate, and interspecific interaction among these two species. W. trilobata benefited more from competitive interaction index (CII) under fluctuated water depth at 15 cm with high nutrients, and the value of CII was clearly positive. Therefore, higher competitive ability may contribute to the invasiveness of W. trilobata in wetlands. K E Y W O R D Scompetitive interaction index, interaction, invasion, invasive species, nutrients, Water depth How to cite this article: Sun J, Javed Q, Azeem A, et al. Fluctuated water depth with high nutrient concentrations promote the invasiveness of Wedelia trilobata in Wetland. Ecol

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“…Our findings on the biomass allocation pattern at different clonal growth stages are inconsistent with those of Goldberg and Novoplansky (1997), which measured the competitive effects on survival, but not on growth parameters and at different nutrient levels. The different results may be explained by differences in stress intensity (Pugnaire andLuque 2001, Brooker et al 2008), and the role of nutrient availability on competition has been subjected to contrasting results (Körner 2003, He and Bertness 2014, Roiloa et al 2014, Wang et al 2015. Our main objective was to evaluate the effect of the competition on the focal species when interacting with different neighbours at different levels of a resource gradients (low/high).…”

Section: Discussionmentioning

confidence: 99%

“…In our study, both nutrient levels and root treatments affected the R/S ratio of the focal plant when interacting with a conspecific, distant relative and close relative only at the no segregation treatment (NS). Some studies have suggested that higher nutrients will result in more severe competition due to more root-shoot competition (Morris 2003, Wang et al 2015 while other studies have shown less competition at high nutrient level (Wilson andTilman 1993, Goldberg andNovoplansky 1997). Intraspecific plant interaction is more complicated because if plant recognizes its conspecific neighbor, it will not compete for resources even if the resource requirement of conspecifics are more similar than heterospecific ones.…”

Section: Discussionmentioning

confidence: 99%

Effect of soil nutrients, neighbor identities and root separation types on intra‐ and interspecific interaction among three clonal plant species

Jaafry

Fan

Liu

et al. 2019

Nordic Journal of Botany

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In natural environments, plants frequently interact with both heterospecific and conspecific neighbors. The intensity of belowground plant interaction with neighboring species commonly varies with the availability of soil nutrients in the habitats. According to classical ecological theory, competition between conspecific neighbors may be more severe than competition between unrelated species due to the similar nutrient requirements of close relatives, especially when nutrients are scarce in the habitat. However, many recent studies have shown the opposite pattern, and suggested an alternative mechanism based on species recognition. Taking Zoysia sinica as the focal species, we conducted a controlled experiment to test the results of intraspecific and interspecific interactions among three clonal species Zoysia sinica, Zoysia japonica and Alternanthera philoxeroides, which represent a conspecific, a close relative and a distant relative of the focal species, respectively, and at different root treatments (no separation NS, clone separation CS and ramet separation RS) and two nutrient levels. The results showed that Z. sinica recognized conspecific plants in the NS and CS treatments, and did not show above or belowground competition with these. The performance of the focal plant (Z. sinica) was better when it was grown with a conspecific neighbor as compared to all other types of neighbors. In all root separation treatments, the competition was more intense when Z. sinica grew with a close relative (Z. japonica) than when growing with a distant relative (A. philoxeroides). Generally, competition between plants was more intense at the high nutrient level than at the low nutrient level, suggesting that both soil nutrients and a species recognition mechanism play a significant role for the intra‐ and interspecific interaction and fitness of these three neighboring clonal species.

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Nitrogen addition increases intraspecific competition in the invasive wetland plant Alternanthera philoxeroides, but not in its native congener Alternanthera sessilis

Cited by 23 publications

References 41 publications

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Fluctuated water depth with high nutrient concentrations promote the invasiveness ofWedelia trilobatain Wetland

Effect of soil nutrients, neighbor identities and root separation types on intra‐ and interspecific interaction among three clonal plant species

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