Longevity and senescence of needles in Pinus cembra L.

Nebel, Barbara; Matile, Philippe

doi:10.1007/bf00202431

Cited by 28 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Black line shows data from the present study (mean values; N = 10 sites having needle data for three cohorts [0, 1, and 2 years]). Gray line shows data from published studies (mean values, N = 5 sites; Nebel and Matile , Giertych et al. , Kayama et al.…”

Section: Discussionmentioning

confidence: 99%

Nutrient remobilization in tree foliage as affected by soil nutrients and leaf life span

Achat

Pousse²,

Nicolas³

et al. 2018

Ecological Monographs

View full text Add to dashboard Cite

Nutrient remobilization is a key process in nutrient conservation in plants and in nutrient cycling in ecosystems. To predict the productivity of terrestrial ecosystems, we thus need to improve our understanding of the factors that control remobilization. We studied the remobilization rates of several major nutrients (N, P, S, K, Ca, and Mg) in 102 forest ecosystems representing large environmental gradients at the country scale (France). Total amounts or availability of nutrients in soils were correlated with nutrient remobilization: the larger the soil nutrient pool, the lower the remobilization rate (e.g., P remobilization decreased with increasing total or extractable inorganic P in soils). Soil type and soil parent material influenced nutrient remobilization indirectly through their effect on soil nutrients. Nutrient remobilization was also affected by the quality of soil organic matter (C:N and C:P ratios) and K‐Ca‐Mg antagonisms. In addition to soil properties, plant‐related parameters (nutrient concentrations in foliage and leaf life span) and climate variables (e.g., precipitation and actual evapotranspiration) were also correlated with nutrient remobilization. Using multivariate analysis, we found that soil nutrient richness and the life span of the leaf were generally the two most important factors controlling nutrient remobilization. As a whole, the nutrient remobilization rate is regulated by soil nutrients through negative feedback. This general ecological pattern is modulated by ecophysiological constraints of plants, mainly leaf life span or the capability of plants to move Ca through the phloem sap.

show abstract

Section: Discussionmentioning

confidence: 99%

Nutrient remobilization in tree foliage as affected by soil nutrients and leaf life span

Achat

Pousse²,

Nicolas³

et al. 2018

Ecological Monographs

View full text Add to dashboard Cite

show abstract

“…Needle accumulation rates cannot be directly used to assess the past abundance of larch and cembra pine. Differences in needle phenology between cembra pine, for which the life of needles is between 3 and 12 yr according to ecological conditions (Nebel & Matile, ; Li et al ., ), and larch, which is a deciduous conifer, result in an overrepresentation of larch needles in sediments (Blarquez et al ., ). We thus used transfer functions to estimate past larch and cembra pine basal areas.…”

Section: Methodsmentioning

confidence: 99%

Fire ecology of a tree glacial refugium on a nunatak with a view on Alpine glaciers

Carcaillet

Blarquez

2017

New Phytologist

View full text Add to dashboard Cite

In paleoecology, the function of biomass as a fire driver has become a focus of attention in cold ecosystems, and concerns have been raised about climate in this context. Little is known about the fire frequency and fire-plant relationships during glaciation when woodlands were limited and the climate was cold. Fire history and tree biomass were reconstructed from sedimentary charcoal and macroremains, respectively, archived in lake sediments from the western Alps. Two nunataks were investigated, both with lacustrine sediments covering the last 21 000 yr at least. During the Last Glacial Maximum (LGM) and the Lateglacial, fires occurred only on the nunatak sheltering woody plants. Cembra pine (Pinus cembra) and larch (Larix decidua) survived above glaciers during the LGM, thus evidencing a biological refugium and supporting the nunatak theory. We highlighted a long-term relationship between fires and dominant trees over the last 21 000 yr, where fire frequencies track the global climate and the local changes in tree biomass. Glacial climate (dry, cold) does not rule out fires. Fuel load and composition were significant fire drivers, with cembra pine dominating during colder periods with rare fires, and larch during the warmer Holocene with frequent fires. These findings increase knowledge of fire ecology in cold environments, and open perspectives in tree population genetics by considering new areas of tree glacial refugia in Europe.

show abstract

“…Chl-degrading processes have been observed in diverse species across the entire taxonomic range: in red algae (79), diatoms (152), green algae (22, 25), and prokaryotes (42, 99), and the leaves of many bryophytes, pteridophytes, and gymnosperms lose Chl during a process that closely resembles foliar senescence in angiosperms (7,9,21,43,86,109,114). In most of these instances of Chl bleaching, only Chlide, pheo-pigments (Pheide and Phein) and their pyroforms have been identified as degradation products so far (34, 79,151,189).…”

Section: Chlorophyll-degrading Organismsmentioning

confidence: 99%

Chlorophyll Degradation

Matile

Hörtensteiner

Thomas

1999

Annu. Rev. Plant. Physiol. Plant. Mol. Biol.

Self Cite

501

358

View full text Add to dashboard Cite

Although the loss of green color in senescent leaves and ripening fruits is a spectacular natural phenomenon, research on chlorophyll breakdown has been largely neglected until recently. This review summarizes knowledge about the fate of chlorophyll in degreening tissues that has been gained during the past few years. Structures of end- and intermediary products of degradation as well as the biochemistry of the porphyrin-cleaving reaction have been elucidated. The intracellular localization of the catabolic pathway is particularly important in the regulation of chlorophyll breakdown. None of the genes encoding the related catabolic enzymes has so far been isolated, which makes chlorophyll degradation an area of opportunity for future research.

show abstract

Longevity and senescence of needles in Pinus cembra L.

Cited by 28 publications

References 10 publications

Nutrient remobilization in tree foliage as affected by soil nutrients and leaf life span

Nutrient remobilization in tree foliage as affected by soil nutrients and leaf life span

Fire ecology of a tree glacial refugium on a nunatak with a view on Alpine glaciers

Chlorophyll Degradation

Contact Info

Product

Resources

About