Conspecific and phylogenetic density-dependent survival differs across life stages in two temperate old-growth forests in Northeast China

Pu, Xucai; Jin, Guangze

doi:10.1016/j.foreco.2018.04.055

Cited by 28 publications

(23 citation statements)

References 69 publications

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“…The spruce‐fir is dominated by three EM species: Picea koraiensis , Abies nephrolepis and Larix gmelinii ; the dominated AM species are Acer tsegmentosum and Prunus padus . In 2005 and 2006, we established a 9 ha (300 m × 300 m) forest dynamics plot in the broad‐leaved pine forest and a 9.12 ha (380 m × 240 m) forest dynamics plot in the spruce‐fir forest (Pu & Jin, 2018). The broad‐leaved pine plot shows a more rugged terrain than the spruce‐fir plot, the elevation range is 83 m in the broad‐leaved pine plot but only 5 m in the spruce‐fir plot.…”

Section: Methodsmentioning

confidence: 99%

“…In the first census in 2005 and 2006, all woody stems with a diameter at breast height (DBH) ≥2 cm in these two plots were mapped, measured, tagged and identified to the species level (Pu & Jin, 2018).…”

Section: Focal Individuals and The Mycorrhizal Type Of Speciesmentioning

confidence: 99%

“…We established 900 seedling quadrats (2 m × 2 m) in 2006 in the broad-leaved pine plot and 912 seedling quadrats (2 m × 2 m) in 2007 in the spruce-fir plot, and these quadrats were located at the corners of 10 m × 10 m grids in these two plots. In each quadrat, all woody seedlings with a DBH <1 cm and a height ≥10 cm were tagged, identified and measured for height (Pu & Jin, 2018). Because there were some missing DBH measurements for some large individuals in our previous censuses, here we defined the seedlings as individuals with 10 cm ≤ height ≤ 1.6 m. In this study, we used the survival data from 2012 to 2016 for seedlings and from 2010 to 2015 for saplings in the broad-leaved pine plot, and survival data from 2011 to 2015 for seedlings and from 2011 to 2016 for saplings in the spruce-fir plot (Pu & Jin, 2018).…”

Section: Focal Individuals and The Mycorrhizal Type Of Speciesmentioning

confidence: 99%

“…Previous studies have found that the CNDD is often stronger for plants in early life stages (LaManna et al, 2016;Zhu, Comita, Hubbell, Ma, & Shefferson, 2015;Zhu et al, 2018); and correspondingly we performed our analyses focusing on seedlings and saplings. We defined our sapling stage class according to LaManna et al (2016), with saplings as the individuals with 1 cm ≤ DBH < 10 cm for overstory tree species defined in Pu and Jin (2018). For the understorey tree species and shrubs, we defined the saplings as the individuals with DBH < 5 and 2 cm (LaManna et al, 2016).…”

Section: Focal Individuals and The Mycorrhizal Type Of Speciesmentioning

confidence: 99%

“…For each focal individual, we divided its surrounding neighbours into two groups and calculated the corresponding indices: the conspecific neighbour's index (CI) and the heterospecific neighbour's index (HI). These neighbour indices account for both the neighbour basal area and its distance to the focal individual (Chen et al, 2016;Pu & Jin, 2018). For simplicity, we only showed the formula of CI (cm 2 /m):…”

Section: Neighbour Density Indexmentioning

confidence: 99%

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Tree mycorrhizal type mediates the strength of negative density dependence in temperate forests

et al. 2020

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1. Recent plant-soil feedback experiments suggest that arbuscular mycorrhizal (AM) tree species experience stronger conspecific negative density dependence (CNDD) than ectomycorrhizal (EM) tree species. Yet, how these findings inform our understanding of natural systems is limited because the roles of local soil conditions, light availability and tree species abundances in influencing CNDD for AM and EM species are not clear. 2. Here we examined seedling and sapling survival in two temperate old-growth forests (broad-leaved pine and spruce-fir forests) in Northeast China, to evaluate the effects of both conspecific and heterospecific neighbour density, as well as the soil and light environments, on the survival of AM-and EM-dependent trees at early life stages. 3. While light availability increased the survival of EM seedlings, soil organic resources increased EM sapling survival in the spruce-fir plot. AM tree species suffered stronger CNDD than did EM tree species in both plots. In the spruce-fir plot, soil factors and light availability mediated species CNDD but their effects differed between AM and EM species, and also between seedlings and saplings. For seedlings in both plots, we found that AM species exhibited a positive relationship between species abundance and CNDD strength, whereas this relationship was negative for EM species. 4. Synthesis. Our results provide one of the few tests of how fungal symbioses determine species responses to intraspecific and interspecific interactions and the direct effects of local environmental conditions on seedling and sapling survival. We show that mycorrhizal type mediates the strength of CNDD and its relationship with species abundance. These results suggest that tree mycorrhizal association can determine the strength of CNDD effect on both rare and common species, and these CNDD differences are likely to influence the community composition of temperate forests.

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Section: Methodsmentioning

confidence: 99%

Section: Focal Individuals and The Mycorrhizal Type Of Speciesmentioning

confidence: 99%

Section: Focal Individuals and The Mycorrhizal Type Of Speciesmentioning

confidence: 99%

Section: Focal Individuals and The Mycorrhizal Type Of Speciesmentioning

confidence: 99%

Section: Neighbour Density Indexmentioning

confidence: 99%

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Tree mycorrhizal type mediates the strength of negative density dependence in temperate forests

et al. 2020

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Seedling survival simultaneously determined by conspecific, heterospecific, and phylogenetically related neighbors and habitat heterogeneity in a subtropical forest in Taiwan

Huang

Lin

et al. 2022

Ecology and Evolution

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Density dependence and habitat heterogeneity have been recognized as important driving mechanisms that shape the patterns of seedling survival and promote species coexistence in species‐rich forests. In this study, we evaluated the relative importance of density dependence by conspecific, heterospecific, and phylogenetically related neighbors and habitat heterogeneity on seedling survival in the Lienhuachih (LHC) Forest, a subtropical, evergreen forest in central Taiwan. Age‐specific effects of different variables were also studied. We monitored the fates of 1,642 newly recruited seedlings of woody plants within a 25‐ha Forest Dynamics Plot for 2 years. The effects of conspecific, heterospecific, and phylogenetically related neighbors and habitat heterogeneity on seedling survival were analyzed by generalized linear mixed models. Our results indicated that conspecific negative density dependence (CNDD) had a strong impact on seedling survival, and the effects of CNDD increased with seedling age. Heterospecific positive density dependence (HPDD) and phylogenetic positive density dependence (PPDD) had a significant influence on the survival of seedlings, and stronger HPDD and PPDD effects were detected for older seedlings. Furthermore, seedling survival differed among habitats significantly. Seedling survival was significantly higher in the plateau, high‐slope, and low‐slope habitats than in the valley. Overall, our results suggested that the effects of CNDD, HPDD, PPDD, and habitat heterogeneity influenced seedling survival simultaneously in the LHC subtropical forest, but their relative importance varied with seedling age. Such findings from our subtropical forest were slightly different from tropical forests, and these contrasting patterns may be attributed to differences in abiotic environments. These findings highlight the importance to incorporate phylogenetic relatedness, seedling age, and habitat heterogeneity when investigating the impacts of density dependence on seedling survival that may contribute to species coexistence in seedling communities.

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Drought tolerance and species abundance mediate dry season negative density dependence in a tropical forest

Song,

Katabuchi,

Chase

et al. 2024

Ecology

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Conspecific negative density dependence (CNDD) is thought to be a key process in maintaining plant diversity. However, the strength of CNDD is highly variable in space and time as well as among species, and correlates of this variation that might help to understand and explain it remain largely unquantified. Using Bayesian hierarchical models, we took advantage of 10‐year seedling monitoring data that were collected annually in every dry and rainy season in a seasonal tropical forest. We quantified the interspecific variation in the strength of CNDD and its temporal variation. We also examined potential correlates of this interspecific and temporal variation, including species functional traits (such as drought‐tolerant traits, defense‐related traits, and recourse acquisition traits) and species abundances. In the dry season, we found a negative relationship between the density of neighboring conspecific seedlings on seedling survival, while in the rainy season, there was a negative relationship between the density of neighboring conspecific adults on seedling survival. In addition, we found that interspecific variation in CNDD was related to drought‐tolerant traits in the dry season but not in the rainy season. Across years, we found that drought‐intolerant species suffer less CNDD during the dry seasons that have higher rainfall, whereas drought‐tolerant species suffer less CNDD when the dry season has lower rainfall. We also found that rare species suffered stronger CNDD in the dry season. Overall, our study highlights that CNDD is highly variable among species and through time, necessitating a deeper appreciation of the environmental and functional contexts of CNDD and their interactions.

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Conspecific and phylogenetic density-dependent survival differs across life stages in two temperate old-growth forests in Northeast China

Cited by 28 publications

References 69 publications

Tree mycorrhizal type mediates the strength of negative density dependence in temperate forests

Tree mycorrhizal type mediates the strength of negative density dependence in temperate forests

Seedling survival simultaneously determined by conspecific, heterospecific, and phylogenetically related neighbors and habitat heterogeneity in a subtropical forest in Taiwan

Drought tolerance and species abundance mediate dry season negative density dependence in a tropical forest

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