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Increased light availability enhances tolerance against ocean acidification-related stress in the calcifying macroalga Halimedaopuntia

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Acta Oceanologica Sinica 2022年第12期41卷 123-132页

作者： Zhangliang Wei Yating Zhang Fangfang Yang Lijuan Long Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Key Laboratory of Tropical Marine Biotechnology of Hainan Province Sanya Institute of Ocean Eco-Environmental EngineeringSouth China Sea Institute of OceanologySanya 572000China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China

Although the adverse impacts of ocean acidification(OA)on marine calcifiers have been investigated extensively,the anti-stress capabilities regulated by increased light availability are ***,the interactive effects of three light levels(30μmol photons/(m^(2)·s),150μmol photons/(m^(2)·s),and 240μmol photons/(m^(2)·s)combined with two pCO_(2)concentrations(400 ppmv and 1400 ppmv)on the physiological acclimation of the calcifying macroalga Halimeda opuntia were investigated using a pCO_(2)-light coupling *** OA negatively influenced algal growth,calcification,photosynthesis,and other physiological performances in *** relative growth rate under elevated pCO_(2)conditions significantly declined by 13.14%−41.29%,whereas net calcification rates decreased by nearly three-fold under OA ***,increased light availability enhanced stress resistance through the accumulation of soluble organic molecules,especially soluble carbohydrate,soluble protein,and free amino acids,and in combination with metabolic enzyme-driven activities,OA stress was *** carotenoid content under low light conditions increased markedly,and the rapid light curve of the relative electron transport rate was enhanced significantly by increasing light intensities,indicating that this new organization of the photosynthetic machinery in *** accommodated light variations and elevated pCO_(2)***,the enhanced metabolic performance of the calcifying macroalga *** mitigated OA-related stress.

关键词： ocean acidification calcifying macroalga light availability soluble organic molecules enzyme-driven activities

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Effects of elevated carbon dioxide concentration and soil temperature on the growth and biomass responses of mountain maple (Acer spicatum) seedlings to light availability

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Journal of Plant Ecology 2014年第6期7卷 535-543页

作者： Gabriel Danyagri Qing-Lai Dang Faculty of Natural Resources Management Lakehead UniversityThunder BayOntario P7B 65E1Canada

Aims Some shade-tolerant understory tree species such as mountain maple(Acer spicatum L.)exhibit light-foraging growth *** in environmental conditions,such as the rise of carbon dioxide concentration([CO_(2)])in the atmosphere and soil warming,may affect the performance of these species under different light *** investigated how elevated[CO_(2)]and soil warm-ing influence the growth and biomass responses of mountain maple seedlings to light *** The treatments were two levels of light(100%and 30%of the ambient light in the greenhouse),two[CO_(2)](392μmol mol^(−1)(ambient)and 784μmol mol^(−1)(elevated))and two soil tempera-tures(Tsoil)(17 and 22℃).After one growing season,we measured seedling height,root collar diameter,leaf biomass,stem biomass and root *** findings We found that under the ambient[CO_(2)],the high-light level increased seedlings height by 70%and 56%at the low Tsoil and high Tsoil,*** the elevated[CO_(2)],however,the high-light level increased seedling height by 52%and 13%at the low Tsoil and high Tsoil,*** responses of biomasses to light generally followed the response patterns of height growth under both[CO_(2)]and Tsoil and the magnitude of biomass response to light was the lowest under the elevated[CO_(2)]and warmer *** results suggest that the elevated[CO_(2)]and warmer Tsoil under the projected future climate may have negative impact on the colonization of open sites and forest canopy gaps by mountain maple.

关键词： mountain maple elevated CO_(2) soil warming light availability height biomass

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Characteristics of light availability Under Forest Canopies and Its Influences on Photosynthesis of Understory Plants

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Forestry Studies in China 2003年第3期5卷 54-62页

作者： Han Y.H.Chen Faculty of Forestry and Forest Environment Lakehead Univerisity955 Oliver RoadThunder BayOntarioCanada P7B 5E1

Available light under forest canopies includes two components, diffuse light and direct light (sunflecks), and is characterized as low and highly dynamic. Understory habitats under different forest types experience different light conditions. Sunflecks as a critical resource for understory plants have great importance on carbon gain of understory plants. Under the light-limiting habitat, understory plants exhibit a high light utilization efficiency attributed by a post-illumination CO2 uptake. Although different species have different photosynthetic responses, shade plants appear to be acclimated to respond more quickly and efficiently to sunflecks. This acclimation includes a faster induction, relatively lower rate of induction loss, lower photosynthetic compensation point, and higher water use efficiency. The process that shade plants harvest light energy is not well known. Studies of photosynthetic responses to sunflecks in natural conditions are rare. Little is known about constraints on sunfleck utilization, which may change seasonally. Extensive field studies in conjunction with laboratory investigations will be needed to further understand potential and actual constraints on sunfleck utilization. Most studies on photosynthetic responses to fluctuating light condition were done in the level of leaves. Fluctuating light utilization on the basis of whole plants and populations presents future challenges to ecologists.

关键词： forest understory light availability sunflecks shade plants photosynthesis light utilization efficiency.

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Effects of logging on the trade-off between seed and sprout regeneration of dominant woody species in secondary forests of the Natural Forest Protection Project of China

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Ecological Processes 2022年第1期11卷 171-188页

作者： Rong Li Qiaoling Yan Jin Xie Jing Wang Ting Zhang Jiaojun Zhu Qingyuan Forest CERN National Observation and Research StationShenyang 110016Liaoning ProvinceChina CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Agricultural Water Resources Hebei Key Laboratory of Soil EcologyCenter for Agricultural Resources ResearchInstitute of Genetic and Developmental BiologyChinese Academy of SciencesShijiazhuang 050021China

Background:Promoting natural regeneration(including seed and sprout regeneration)of dominant woody species is essential for restoring secondary ***,such restoration processes have been decelerated by the enclosure under Natural Forest Protection Project of China(NFPP).It remains unclear how to implement appropriate management measures(e.g.,whether to apply logging and the suitable intensity)to facilitate natural regeneration according to the responses of two regeneration modes to management *** monitored the early stages of seed regeneration(seed rain,soil seed bank,and 1–3-year-old seedlings)and sprout regeneration(stump sprout rate,stump survival rate,probability of sprouting,and number of sprouts per stump)over the first 3 years(2017–2019)after logging under three intensity regimes(control[0%],25%,and 50%logging intensity)in secondary ***:The seed rain density decreased markedly,seedling density increased insignificantly after logging,and logging promoted seedling survival at an increasing conversion rate of 3-year-old seedlings(37.5%under 0%,100%under 25%,and 80.95%under 50%logging)compared to those of the *** proportion of 3-year-old seedlings increased with logging intensity and was the highest(16.2%)at 50%logging *** density was not affected by logging intensity,however,under 25%and 50%logging,it decreased by 27%and 6%in 2018,and by 37%and 33%in 2019,*** density was 41.65-and 15.31-fold higher than that of sprouts in the 50%and 25%logging treatments,*** on the relative contributions of the two regeneration modes after logging,three groups of natural regeneration patterns were classified for dominant woody species in temperate secondary forests,i.e.,seed regeneration preference(Betula dahurica,Carpinus cordata and Fraxinus mandshurica),sprout regeneration preference(Acer mono and Acer pseudosieboldianum)and no preference(Quercus mongolica,Fraxinus rhynchophylla,and Juglans ma

关键词： Secondary forest Seed regeneration Sprout regeneration Seedling recruitment light availability

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Phytoplankton functional groups in Poyang Lake:succession and driving factors

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Journal of Oceanology and Limnology 2024年第6期42卷 1764-1776页

作者： Jinfu LIU Haoyue ZOU Feng DENG Yutian LIU Wei LI Jinying XU Songping LIU Qiang WU Xiaoliang ZHANG Fagen WENG Qi HUANG Hailin YOU Yuwei CHEN Jiangxi Key Laboratory of Hydrology-Water Resources and Water Environment Nanchang Institute of TechnologyNanchang 330099China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Educationand School of ResourcesEnvironmental&Chemical EngineeringNanchang UniversityNanchang 330031China Lushan Botanical Garden Jiangxi Province and Chinese Academy of SciencesJiujiang 332900China China Railway Water Conservancy&Hydropower Planning and Design Group Co. Ltd.Nanchang 330029China Key Laboratory of Poyang Lake Wetland and Watershed Research Ministry of EducationJiangxi Normal UniversityNanchang 330022China Institute of Watershed Ecology Jiangxi Academy of SciencesNanchang 330096China

Phytoplankton functional groups have gained increasing attention in recent *** understand the composition of phytoplankton functional groups in Poyang Lake and their drivers,field investigations were conducted over three years:2013,2014,and *** were dominated by diatoms,contributing from 20.19%to 57.57%of the total biomass,followed by cyanobacteria,9.81%-39.98%.Microcystis *** Anabaena *** the dominant species among ***-six functional groups were identified among 72 genera or species,and fiver groups(P,B,MP,H1,and G)were categorized *** of dominant groups except H1 were tolerate highly fluctuating mixing intensities and showed a typical monthly succession *** temperature,water level,and nutrients are key drivers for the variation of phytoplankton communities at taxonomic and functional *** of redundancy and variation partitioning analyses showed that environmental variables might explain functional groups better than taxonomic communities,implying that the functional groups were more advantageous in showing the effects of environmental conditions than taxonomic *** conditions have a crucial influence on phytoplankton assemblage dynamics in highly variable water regime lakes,but not in the largest *** functional groups method is suitable for identifying the spatial and seasonal characteristics of aquatic environments that significantly affected by water regimes.

关键词： cyanobacteria bloom light availability nutrients dilution water level Poyang Lake

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Importance of overstorey attributes for understorey litter production and nutrient cycling in European forests

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Forest Ecosystems 2020年第4期7卷 591-601页

作者： Dries Landuyt Evy Ampoorter Cristina CBastias Raquel Benavides Sandra Müller Michael Scherer-Lorenzen Fernando Valladares Safaa Wasof Kris Verheyen Forest&Nature Lab Department of EnvironmentGhent UniversityGhentBelgium LINCGlobal Department of Biogeography and Global ChangeNational Museum of Natural Science-CSICMadridSpain Faculty of Biology GeobotanyUniversity of FreiburgFreiburg im BreisgauGermany.

Background:In contrast with the negligible contribution of the forest understorey to the total aboveground phytobiomass of a forest,its share in annual litter production and nutrient cycling may be more *** and how this functional role of the understorey differs across forest types and depends upon overstorey characteristics remains to be ***:We sampled 209 plots of the FunDivEUROPE Exploratory Platform,a network of study plots covering local gradients of tree diversity spread over six contrasting forest types in *** estimate the relative contribution of the understorey to carbon and nutrient cycling,we sampled non-lignified aboveground understorey biomass and overstorey leaf litterfall in all *** samples were analysed for C,N and P concentrations,overstorey leaf litterfall for C and N *** additionally quantified a set of overstorey attributes,including species richness,proportion of evergreen species,light availability(representing crown density)and litter quality,and investigated whether they drive the understorey’s contribution to carbon and nutrient *** and conclusions:Overstorey litter production and nutrient stocks in litterfall clearly exceeded the contribution of the understorey for all forest types,and the share of the understorey was higher in forests at the extremes of the climatic *** most of the investigated forest types,it was mainly light availability that determined the contribution of the understorey to yearly carbon and nutrient *** species richness did not affect the contribution of the understorey to carbon and nutrient cycling in any of the investigated forest types.

关键词： FunDivEUROPE Nutrient cycling Litter production Understorey Overstorey Tree species richness light availability Litter quality Proportion evergreen tree species

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The Potential for Genotype-by-Environment Interactions to Maintain Genetic Variation in a Model Legume–Rhizobia Mutualism

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Plant Communications 2020年第6期1卷 100-111页

作者： Priya Vaidya John R.Stinchcombe Department of Ecology and Evolutionary Biology University of TorontoTorontoON M5S3B2Canada Koffler Scientific Reserve at Joker’s Hill University of TorontoTorontoON M5S3B2Canada

The maintenance of genetic variation in mutualism-related traits is key for understanding mutualism evolution,yet the mechanisms maintaining variation remain *** asked whether genotype-byenvironment(G3E)interaction is a potential mechanism maintaining variation in the model legume–rhizobia system,Medicago truncatula–Ensifer *** planted 50 legume genotypes in a greenhouse under ambient light and shade to reflect reduced carbon availability for *** found an expected reduction under shaded conditions for plant performance traits,such as leaf number,aboveground and belowground biomass,and a mutualism-related trait,nodule *** also found G3E for nodule number,with83%of this interaction due to shifts in genotype fitness rank order across light environments,coupled with strong positive directional selection on nodule number regardless of light *** results suggest that G3E can maintain genetic variation in a mutualism-related trait that is under consistent positive directional selection across light environments.

关键词： mutualism evolution genetic variation genotype-by-environment interaction Medicago truncatula light availability partner quality

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