Elsevier

Agricultural and Forest Meteorology

Volume 248, 15 January 2018, Pages 177-184
Agricultural and Forest Meteorology

Research paper
A comparative analysis of the spatio-temporal variation in the phenologies of two herbaceous species and associated climatic driving factors on the Tibetan Plateau

https://doi.org/10.1016/j.agrformet.2017.09.021Get rights and content

Highlights

  • Spatial-temporal variation in the phenologies of two plant species was compared.

  • Variation in phenology was mainly driven by the temperature gradient with altitude.

  • Phenological sequence between the two species changed with temperature/altitude.

  • Variation in autumn phenology of both species can be explained by cold degree days.

Abstract

Studying the differences in phenology among plant species is important for understanding their physiological and reproductive responses to climate change and complex inter-species interactions. This study conducted a comparative analysis of the spatio-temporal variation in the phenologies of two herbaceous species (Plantago asiatica and Taraxacum mongolicum) and associated climatic driving factors on the Tibetan Plateau (TP) based on ground-observed phenology data during 2000–2012. The results indicated that both spring and autumn phenology of the two species showed strong dependences on altitude, latitude and longitude, although the magnitudes of the variation with geographical factors were different among species. Change in altitude contributed the most to the spatial variation in phenology for both species. In addition, strong dependences on altitude were also observed for the phenological differences between the two species. With the increase of altitude, the same phenophases of the two species tended to occur synchronously at first and then the chronological order of the same phenophases between the two species changed. Spring and autumn phenophases showed significant negative correlations with the growing degree-days (GDD) and the cold degree-days (CDD) (p < 0.001), respectively. Moreover, the phenophases of T. mongolicum were more sensitive than those of P. asiatica in response to GDD or CDD, which explained the spatial variation in the phenological difference between the two species. The divergent phenological responses to climate change and the spatial variation in phenological differences between P. asiatica and T. mongolicum may alter the inter-species interactions between the two species.

Introduction

Plant phenology is the study of the timing of recurring biological events of plant developmental stages caused by biotic and abiotic factors, including the occurrence of leafing, flowering and fruiting (Lieth, 1974, Morisette et al., 2009). Plant phenology is sensitive to changes in climate and the natural environment (Cong et al., 2012, Morisette et al., 2009). Moreover, it plays a crucial role in regulating the exchange of the fluxes of water, CO2 and energy between the biosphere and atmosphere (Keenan et al., 2012, Richardson et al., 2012, Richardson et al., 2013). Shifts in phenology can reflect the adjustments and responses of the biosphere to climate change (Penuelas and Filella, 2001). Therefore, plant phenology has received extensive attention in the field of global change in recent years (Menzel, 2002).

Global warming has altered plant phenology in recent decades (Menzel et al., 2006, Parmesan and Yohe, 2003, Root et al., 2003). Many studies have reported advanced spring phenology and delayed autumn phenology worldwide, which has resulted in an extended growing season (Jeong et al., 2011, Menzel, 2000, Piao et al., 2006, Zhu et al., 2012). However, the phenological shifts vary in response to climate change at different locations, even for the same species (Primack et al., 2009, Schwartz and Hanes, 2010), and different species within the same community may also show distinct responses (Cleland et al., 2006, Crimmins et al., 2010, Diez et al., 2012, Fitter and Fitter, 2002, Miller-Rushing and Primack, 2008). Moreover, different changes in phenology among species could lead to alterations in inter-species relationships (Stenseth and Mysterud, 2002, Visser and Both, 2005), potentially altering the community structure and function (Richardson et al., 2013). For example, Fitter and Fitter (2002) found that due to the different responses in flowering of 6 pairs of species that can form natural hybrids in the vicinity of a single locality in south-central England, 4 pairs of species were more likely to flower synchronously than they were formerly, increasing the probability of hybridization, and 2 were less likely to, reducing the probability of hybridization.

Plant phenology is much more sensitive to climate change on the Tibetan Plateau (TP) due to its harsh physical environment; this region is commonly known as Earth’s “third pole”. The unique geographical and environmental backgrounds make the TP an ideal region to explore the potential changes in plant communities under climate change by studying inter-species differences in phenological responses. Through experimental warming in a typical alpine meadow on the TP during 2014–2015, Zhu et al. (2016) found that warming caused the convergence of the flowering events of early- and late-flowering species and increased the overlap period of flowering among species, which could alter the competitive relationships among species. However, existing studies about inter-species differences in phenological responses to climate change on the TP to date have mainly focused on a single site with a few years’ records, and a comparative analysis of the spatio-temporal variation in phenology based on multi-site and multi-year phenological records is therefore lacking.

Thanks to the phenology network established by the China Meteorological Administration, a large number of continuous and long-term, ground-observed phenology records across the TP can be available. At present, 26 phenological stations are distributed on the TP, with 22 herbaceous plants and 10 woody plants observed (Zheng et al., 2016). However, only two perennial herbs, herba plantaginis (Plantago asiatica, Plantaginaceae family) and dandelion (Taraxacum mongolicum, Compositae family), were widely observed among all stations. Focusing on the two species, this study aims to reveal the inter-species differences in phenological responses to climate change and the associated climatic driving factors on the TP.

Section snippets

Phenological dataset

The phenological data for P. asiatica and T. mongolicum on the TP were collected from the nation-wide phenological observation network established by the China Meteorological Administration. The starting year for the phenological records of the two species differed among stations and species. For example, the phenology of P. asiatica began to be recorded in 1983 at Huangyuan and Zoige stations, while that of T. mongolicum only started to be recorded in 2002 at Shiqu station. On the other hand,

Occurring time of phenophases

The mean FLD and LCD of P. asiatica occurred at DOY 103 and 284, respectively, resulting in a mean LOG of 181 days (Fig. 2). Meanwhile, the mean FLD, LCD and LOG of T. mongolicum were very close to the mean value of corresponding phenological metrics of P. asiatica. However, the median and the mean value of FFD were 10.50 and 11.15 days earlier for T. mongolicum than P. asiatica, respectively. In addition, the phenological metrics varied more for T. mongolicum than P. asiatica as shown by a

Inter-species differences in the effect of geographical factors on the spatial distributions of phenology

Similar spatial distributions of phenology were observed between T. mongolicum and P. asiatica, although the magnitudes of the spatial variation with geographical factors were different. All phenological metrics for both species showed a strong dependence on geographical factors. Specifically, increasing latitude, longitude and altitude will lead to later spring phenology (FLD and FFD), earlier autumn phenology (LCD) and shorter growing season (LOG). Therefore, the spatial distributions of

Conclusions

Based on ground-observed phenology data on the Tibetan Plateau (TP) during 2000–2012, this study conducted a comparative analysis of the spatio-temporal variation in phenology and associated climatic driving factors for two herbaceous plants (Plantago asiatica and Taraxacum mongolicum). Strong dependence on geographical factors was observed for spring and autumn phenological metrics of both species. Change in altitude contributed the most to the spatial variation in phenology for both species.

Acknowledgements

We thank the editor and reviewers for helpful comments and suggestions. This work was supported by the National Natural Science Foundation of China (No. 41371389) and the State Key Laboratory of Earth Surface Processes and Resource Ecology (No. 2017-FX-01(1)).

References (57)

  • M. Shen et al.

    Influences of temperature and precipitation before the growing season on spring phenology in grasslands of the central and eastern Qinghai-Tibetan Plateau

    Agric. For. Meteorol.

    (2011)
  • T. Wesolowski et al.

    Timing of bud burst and tree-leaf development in a multispecies temperate forest

    For. Ecol. Manage.

    (2006)
  • Z. Zheng et al.

    Continuous but diverse advancement of spring-summer phenology in response to climate warming across the Qinghai-Tibetan Plateau

    Agric. For. Meteorol.

    (2016)
  • China Meteorological Administration

    Observation Criterion of Agricultural Meteorology

    (1993)
  • I. Chuine et al.

    Scaling phenology from the local to the regional level: advances from species-specific phenological models

    Global Change Biol.

    (2000)
  • E.E. Cleland et al.

    Diverse responses of phenology to global changes in a grassland ecosystem

    Proc. Natl. Acad. Sci. U.S.A.

    (2006)
  • T.M. Crimmins et al.

    Complex responses to climate drivers in onset of spring flowering across a semi-arid elevation gradient

    J. Ecol.

    (2010)
  • J.H. Dai et al.

    The spatial pattern of leaf phenology and its response to climate change in China

    Int. J. Biometeorol.

    (2014)
  • A. de Quervain

    Die hebung der atmosphärischen lsothermenin der schweizer alpen und ihre beziehungzuderen Höhengrenzen

    Gerlands Beitr. Geophys.

    (1904)
  • J.M. Diez et al.

    Forecasting phenology: from species variability to community patterns

    Ecol. Lett.

    (2012)
  • A.H. Fitter et al.

    Rapid changes in flowering time in British plants

    Science

    (2002)
  • Y.H. Fu et al.

    Unexpected role of winter precipitation in determining heat requirement for spring vegetation green-up at northern middle and high latitudes

    Global Change Biol.

    (2014)
  • A.L. Gill et al.

    Changes in autumn senescence in northern hemisphere deciduous trees: a meta-analysis of autumn phenology studies

    Ann. Bot.

    (2015)
  • A.D. Hopkins

    Periodical events and natural law as guides to agricultural research and practice

    Mon. Weath. Rev. U.S. Dep. Agric. Suppl.

    (1918)
  • M.F. Hutchinson

    Anusplin Version 4.3, Center for Resource and Environmental Studies

    (2004)
  • S.J. Jeong et al.

    Phenology shifts at start vs. end of growing season in temperate vegetation over the Northern Hemisphere for the period 1982–2008

    Global Change Biol.

    (2011)
  • T.F. Keenan et al.

    Terrestrial biosphere model performance for inter-annual variability of land-atmosphere CO2 exchange

    Global Change Biol.

    (2012)
  • J. Laube et al.

    Chilling outweighs photoperiod in preventing precocious spring development

    Global Change Biol.

    (2014)
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