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Linking belowground and aboveground phenology in two boreal forests in Northeast China.

Identifieur interne : 002030 ( Main/Corpus ); précédent : 002029; suivant : 002031

Linking belowground and aboveground phenology in two boreal forests in Northeast China.

Auteurs : Enzai Du ; Jingyun Fang

Source :

Oecologia [ 1432-1939 ] ; 2014.

RBID : pubmed:25164492

English descriptors

KwdEn :
- China (MeSH), Climate Change (MeSH), Down-Regulation (MeSH), Forests (MeSH), Models, Biological (MeSH), Plant Leaves (growth & development), Plant Roots (growth & development), Plant Roots (metabolism), Seasons (MeSH), Soil (MeSH), Temperature (MeSH), Trees (growth & development), Trees (metabolism).
MESH :
- chemical : Soil.
- growth & development : Plant Leaves, Plant Roots, Trees.
- metabolism : Plant Roots, Trees.
- China, Climate Change, Down-Regulation, Forests, Models, Biological, Seasons, Temperature.

Abstract

The functional equilibrium between roots and shoots suggests an intrinsic linkage between belowground and aboveground phenology. However, much less understanding of belowground phenology hinders integrating belowground and aboveground phenology. We measured root respiration (Ra) as a surrogate for root phenology and integrated it with observed leaf phenology and radial growth in a birch (Betula platyphylla)-aspen (Populus davidiana) forest and an adjacent larch (Larix gmelinii) forest in Northeast China. A log-normal model successfully described the seasonal variations of Ra and indicated the initiation, termination and peak date of root phenology. Both root phenology and leaf phenology were highly specific, with a later onset, earlier termination, and shorter period of growing season for the pioneer tree species (birch and aspen) than the dominant tree species (larch). Root phenology showed later initiation, later peak and later termination dates than leaf phenology. An asynchronous correlation of Ra and radial growth was identified with a time lag of approximately 1 month, indicating aprioritization of shoot growth. Furthermore, we found that Ra was strongly correlated with soil temperature and air temperature, while radial growth was only significantly correlated with air temperature, implying a down-regulating effect of temperature. Our results indicate different phenologies between pioneer and dominant species and support a down-regulation hypothesis of plant phenology which can be helpful in understanding forest dynamics in the context of climate change.

DOI: 10.1007/s00442-014-3055-y
PubMed: 25164492

Links to Exploration step

pubmed:25164492

Le document en format XML

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<author><name sortKey="Du, Enzai" sort="Du, Enzai" uniqKey="Du E" first="Enzai" last="Du">Enzai Du</name>
<affiliation><nlm:affiliation>Department of Ecology, College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China, duez@pku.edu.cn.</nlm:affiliation>
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<author><name sortKey="Fang, Jingyun" sort="Fang, Jingyun" uniqKey="Fang J" first="Jingyun" last="Fang">Jingyun Fang</name>
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<term>Models, Biological (MeSH)</term>
<term>Plant Leaves (growth & development)</term>
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<term>Plant Roots (metabolism)</term>
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<front><div type="abstract" xml:lang="en">The functional equilibrium between roots and shoots suggests an intrinsic linkage between belowground and aboveground phenology. However, much less understanding of belowground phenology hinders integrating belowground and aboveground phenology. We measured root respiration (Ra) as a surrogate for root phenology and integrated it with observed leaf phenology and radial growth in a birch (Betula platyphylla)-aspen (Populus davidiana) forest and an adjacent larch (Larix gmelinii) forest in Northeast China. A log-normal model successfully described the seasonal variations of Ra and indicated the initiation, termination and peak date of root phenology. Both root phenology and leaf phenology were highly specific, with a later onset, earlier termination, and shorter period of growing season for the pioneer tree species (birch and aspen) than the dominant tree species (larch). Root phenology showed later initiation, later peak and later termination dates than leaf phenology. An asynchronous correlation of Ra and radial growth was identified with a time lag of approximately 1 month, indicating aprioritization of shoot growth. Furthermore, we found that Ra was strongly correlated with soil temperature and air temperature, while radial growth was only significantly correlated with air temperature, implying a down-regulating effect of temperature. Our results indicate different phenologies between pioneer and dominant species and support a down-regulation hypothesis of plant phenology which can be helpful in understanding forest dynamics in the context of climate change.</div>
</front>
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Linking belowground and aboveground phenology in two boreal forests in Northeast China.

Linking belowground and aboveground phenology in two boreal forests in Northeast China.

Source :

English descriptors

Abstract

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Pour manipuler ce document sous Unix (Dilib)

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