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  • Oxford University Press (OUP)  (4)
  • Zhou, Xuhui  (4)
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  • Oxford University Press (OUP)  (4)
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  • 1
    Online Resource
    Online Resource
    Declining carbohydrate content of Sitka-spruce treesdying from seawater exposure
    Oxford University Press (OUP) ; 2021
    In:  Plant Physiology Vol. 185, No. 4 ( 2021-04-23), p. 1682-1696
    Details
    In: Plant Physiology, Oxford University Press (OUP), Vol. 185, No. 4 ( 2021-04-23), p. 1682-1696
    Abstract: Increasing sea levels associated with climate change threaten the survival of coastal forests, yet the mechanisms by which seawater exposure causes tree death remain poorly understood. Despite the potentially crucial role of nonstructural carbohydrate (NSC) reserves in tree survival, their dynamics in the process of death under seawater exposure are unknown. Here we monitored progressive tree mortality and associated NSC storage in Sitka-spruce (Picea sitchensis) trees dying under ecosystem-scale increases in seawater exposure in western Washington, USA. All trees exposed to seawater, because of monthly tidal intrusion, experienced declining crown foliage during the sampling period, and individuals with a lower percentage of live foliated crown (PLFC) died faster. Tree PLFC was strongly correlated with subsurface salinity and needle ion contents. Total NSC concentrations in trees declined remarkably with crown decline, and reached extremely low levels at tree death (2.4% and 1.6% in leaves and branches, respectively, and 0.4% in stems and roots). Starch in all tissues was almost completely consumed, while sugars remained at a homeostatic level in foliage. The decreasing NSC with closer proximity to death and near zero starch at death are evidences that carbon starvation occurred during Sitka-spruce mortality during seawater exposure. Our results highlight the importance of carbon storage as an indicator of tree mortality risks under seawater exposure.
    Type of Medium: Online Resource
    ISSN: 0032-0889 , 1532-2548
    URL: Article
    DOI: 10.1093/plphys/kiab002
    RVK:
    WA 15000
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2021
    detail.hit.zdb_id: 2004346-6
    detail.hit.zdb_id: 208914-2
    SSG: 12
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Patterns and mechanisms of belowground carbon responses to changes in precipitation
    Oxford University Press (OUP) ; 2024
    In:  Journal of Plant Ecology Vol. 17, No. 2 ( 2024-04-01)
    Details
    In: Journal of Plant Ecology, Oxford University Press (OUP), Vol. 17, No. 2 ( 2024-04-01)
    Abstract: It is well known that aboveground productivity usually increases with precipitation. However, how belowground carbon (C) processes respond to changes in precipitation remains elusive, although belowground net primary productivity (BNPP) represents more than one-half of NPP and soil stores the largest terrestrial C in the biosphere. This paper reviews the patterns of belowground C processes (BNPP and soil C) in response to changes in precipitation from transect studies, manipulative experiments, modeling and data integration and synthesis. The results suggest the possible existence of nonlinear patterns of BNPP and soil C in response to changes in precipitation, which is largely different from linear response for aboveground productivity. C allocation, root turnover time and species composition may be three key processes underlying mechanisms of the nonlinear responses to changes in precipitation for belowground C processes. In addition, microbial community structure and long-term ecosystem processes (e.g. mineral assemblage, soil texture, aggregate stability) may also affect patterns of belowground C processes in response to changes in precipitation. At last, we discuss implications and future perspectives for potential nonlinear responses of belowground C processes to changes in precipitation.
    Type of Medium: Online Resource
    ISSN: 1752-993X
    URL: Article
    DOI: 10.1093/jpe/rtae011
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2024
    detail.hit.zdb_id: 2381013-0
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Greater responses of flower phenology of Kobresia pygmaea community to precipitation addition than to constant and stepwise warming
    Oxford University Press (OUP) ; 2023
    In:  Journal of Plant Ecology Vol. 16, No. 2 ( 2023-04-01)
    Details
    In: Journal of Plant Ecology, Oxford University Press (OUP), Vol. 16, No. 2 ( 2023-04-01)
    Abstract: There is a debate about unmatched results between manipulative warming using constant warming rates every year (CW) and long-term observations warming affect temperature sensitivity of flowering phenology. This may be because long-term observations represent the actual yearly increase in temperature (i.e. a yearly stepwise warming rate per year, SW) which would differ from CW and their effects would be regulated by precipitation alteration. We conducted a warming experiment with CW (temperature increase by +1 °C and sustained this elevated temperature for the duration of the study) and SW (temperature increase by + 0.25 °C progressively each year) with precipitation addition in an alpine grassland for four years. Our results showed that neither warming rate affected community flowering phenology. However, precipitation addition advanced onsets of flowering for early-spring flowering (ESF) and mid-summer flowering (MSF) groups, and advanced the end date of flowering for ESF but delayed it for the MSF group. Therefore, flowering duration remained stable for the ESF group and prolonged for the MSF group, and further prolonging the flowering duration of the community. There were no interactions between warming rates and precipitation addition on the community’s flowering phenology. A severe drought in a year significantly decreased the maximal number of community flowers in the following year. Therefore, a change in precipitation has a greater effect than warming on the community flowering phenology in the semi-arid alpine grassland.
    Type of Medium: Online Resource
    ISSN: 1752-993X
    URL: Article
    DOI: 10.1093/jpe/rtac066
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2023
    detail.hit.zdb_id: 2381013-0
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Effects of tree mycorrhizal type on soil respiration and carbon stock via fine root biomass and litter dynamic in tropical plantations
    Oxford University Press (OUP) ; 2023
    In:  Journal of Plant Ecology Vol. 16, No. 1 ( 2023-02-01)
    Details
    In: Journal of Plant Ecology, Oxford University Press (OUP), Vol. 16, No. 1 ( 2023-02-01)
    Abstract: Tropical forests are among the most productive and vulnerable ecosystems in the planet. Several global forestation programs are aiming to plant millions of trees in tropical regions in the future decade. Mycorrhizal associations are known to largely influence forest soil carbon (C) stocks. However, to date, little is known on whether and how different tree mycorrhizal types affect soil respiration (Rs) and C stocks in tropical forests. In this study, we used a three-decade tropical common garden experiment, with three arbuscular mycorrhizal (AM) and three ectomycorrhizal (EM) monocultures, to investigate the impacts of tree mycorrhizal type on Rs and soil C stocks. Associating biotic (e.g. root biomass, litter dynamic, soil microbes) and abiotic factors (e.g. microclimate) were also measured. Our results showed that AM stands supported significantly higher Rs and soil C stock, litter turnover rate and fine root biomass than EM stands. Further statistical analysis displayed that tree mycorrhizal type was the most important factor in regulating Rs and soil C stock compared with other biotic or abiotic factors. Moreover, we found that mycorrhizal type directly and indirectly affected Rs and soil C stocks via fine root biomass and litter dynamic, i.e. litter production, litter standing crop and litter turnover rate. Our findings highlight important effects of tree mycorrhizal type on forest C cycle, suggesting that planting AM tree species could contribute to promotion of soil C stock in tropical ecosystems.
    Type of Medium: Online Resource
    ISSN: 1752-993X
    URL: Article
    DOI: 10.1093/jpe/rtac056
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2023
    detail.hit.zdb_id: 2381013-0
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
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