Variant responses of tree seedling to seasonal drought stress along an elevational transect in tropical montane forests

Song, Xiqiang; Li, Jieqiong; Zhang, Wenfu; Tang, Yong; Sun, Zhenhua; Cao, Min

doi:10.1038/srep36438

Cited by 14 publications

(12 citation statements)

References 60 publications

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“…Contrary to previous work demonstrating lower tropical seedling growth rates during the dry season as compared to the rainy season (Comita & Engelbrecht, 2009; Song et al., 2016), we found significantly higher growth rates in the dry season than in the rainy season (Figure ). This result could be explained in multiple ways.…”

Section: Discussioncontrasting

confidence: 99%

“…Here, we present a study designed to quantify the growth responses of seedlings in a monsoonal subtropical forest to varying abiotic and biotic conditions in space and time to determine if fundamental trade‐offs relating to growth can be detected and if functional traits can predict where species fall along these trade‐off axes. Monsoonal forest have a 6‐month dry season, which causes growth to be limited by water availability during this season (Song et al., 2016) as it is in seasonal tropical forests (Belda, Holtanova, Halenka, & Kalvova, 2014). However, during the rainy season, light limitation in the understorey may become the key limiting factor instead of soil moisture (Poorter & Hayashida‐Oliver, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Traits mediate a trade‐off in seedling growth response to light and conspecific density in a diverse subtropical forest

et al. 2020

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Understanding tree species responses to biotic and abiotic factors is fundamental for stronger predictions of community assembly and dynamics. However, several challenges remain. These include a failure to investigate whether there is evidence for key hypothesized life‐history trade‐offs and to link these trade‐offs to functional traits. In this study, we seek to explicitly address the above outstanding challenges by constructing models for individual seedling growth in response to abiotic and biotic factors using 3 years of seedling census data from a 20‐ha subtropical forest dynamics plot in a diverse subtropical forest and correlated these responses with functional traits. We found that light and conspecific neighbours increase and decrease the RGR of tree seedlings respectively. We also found that the ability of a species to positively respond to canopy openness trades‐off against susceptibility to conspecific negative density dependence (CNDD). This trade‐off was evident across seasons and could be predicted on functional trait—stem and leaf dry matter content. Synthesis. Our findings indicate species that can grow quickly in high‐light environments also tend to suffer more CNDD. The results highlight that strong evidence of a trade‐off relating to growth and defence widely hypothesized to be of importance in diverse tree communities and that this trade‐off occurs across seasons and can be linked to a commonly measured functional trait.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Traits mediate a trade‐off in seedling growth response to light and conspecific density in a diverse subtropical forest

et al. 2020

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“…To test the relationship between mean daily understory temperature and elevation, we generated a simple linear regression using published [43] and unpublished understory temperature measurements recorded on 11 July to 8 September 2015 at the same plots from which ants were sampled in all three elevational transects. Hourly temperature was recorded from each plot using thermologgers (DS1923 Hygrochron® iButton®, Maxim, CA, USA) placed 1.3 m above the ground [43].…”

Section: Methodsmentioning

confidence: 99%

Taxonomic and Functional Ant Diversity Along tropical, Subtropical, and Subalpine Elevational Transects in Southwest China

Fontanilla

Nakamura

et al. 2019

Insects

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Although elevational gradients of biodiversity have long been the topic of scientific research, information on patterns of, and processes that shape insect community structure across elevation is still lacking. Addressing this gap requires the use of both taxonomic and functional approaches when studying diversity across elevational gradients. In this study, we examined taxonomic and functional alpha and beta diversity of ant assemblages sampled along tropical, subtropical, and subalpine elevational transects in Yunnan Province, southwest China. Species richness was used to quantify taxonomic alpha diversity, and two indices (FD and FRic) were calculated using morphological measurements to quantify functional alpha diversity. Taxonomic and functional beta diversity were partitioned into their turnover- and nestedness-resultant components. Though temperature and functional alpha diversity decreased linearly with increasing elevation, taxonomic alpha diversity showed a significant logarithmic decrease, with few species present at elevations greater than 3000 m a.s.l. The turnover-resultant component of taxonomic beta diversity increased with increasing elevational distance, while the nestedness-resultant component of functional beta diversity increased with increasing elevational distance in the subtropical transect. The observed patterns of taxonomic and functional diversity reflected ants’ thermophilic nature, implying functional adaptations (i.e., nested functional diversity) at higher elevations where environmental conditions were unfavorable.

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“…Due to the seasonality of regional hydrometeorological conditions (Song et al, ), reservoir operation schemes for drought mitigation generally exhibit significant seasonal variations. Hence, DPLWLs are affected by seasonality and vary by season, which is similar to the seasonal flood‐limited water level advocated by the U.S. Army Corps of Engineers ().…”

Section: Methodsmentioning

confidence: 99%

Reservoir Operations to Mitigate Drought Effects With a Hedging Policy Triggered by the Drought Prevention Limiting Water Level

Chang

Guo

Wang

et al. 2019

Water Resources Research

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Severe drought events worldwide have considerably unfavorable effects on social and economic development. This paper proposes a hedging policy triggered by the seasonal drought prevention limiting water level (DPLWL) for reservoir operations during a drought event. By using this hedging policy, water resources managers can determine operating policies for drought emergence management according to specific drought conditions. A modeling framework that determines the seasonal DPLWL under different drought conditions is developed based on long-term hydrological and meteorological information and optimal reservoir operation schemes. In particular, Fisher's optimal partitioning algorithm is applied to identifying the seasonality of the DPLWL based on hydroclimatological factors and reservoir storage conditions. The multireservoir system in the Yellow River Basin is used as a case study to assess the performance of the hedging policy triggered by DPLWLs. The results show that DPLWL has a significant advantage over the standard reservoir operation rules when dealing with multireservoir operation for drought mitigation.Plain Language Summary Droughts, which can be a creeping disaster, can cause both natural environmental and social damage. This paper first proposes a hedging policy triggered by the drought prevention limiting water level (DPLWL) for reservoir operations to mitigate drought impacts. Furthermore, a new framework is developed to determine seasonal DPLWLs. This framework is applied to the Yellow River Basin, of which the water flow is regulated by a series of large reservoirs. This study extends the literature on hedging rules for reservoir operation by proposing a new methodology coupled with the DPLWLs, the multivariate integrated drought index (MIDI), and a reservoir operation model. The proposed approach is of great significance for decision makers in water resources management during droughts, particularly in the context of global warming.

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Variant responses of tree seedling to seasonal drought stress along an elevational transect in tropical montane forests

Cited by 14 publications

References 60 publications

Traits mediate a trade‐off in seedling growth response to light and conspecific density in a diverse subtropical forest

Traits mediate a trade‐off in seedling growth response to light and conspecific density in a diverse subtropical forest

Taxonomic and Functional Ant Diversity Along tropical, Subtropical, and Subalpine Elevational Transects in Southwest China

Reservoir Operations to Mitigate Drought Effects With a Hedging Policy Triggered by the Drought Prevention Limiting Water Level

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