Dendroclimatic signals deduced from riparian versus upland forest interior pines in North Karelia, Finland

Helama, Samuli; Arentoft, Birgitte W.; Collin-Haubensak, Olivier; Hyslop, Michael D.; Brandstrup, Charlotte K.; Mäkelä, Hanna; Tian, Qin Hua; Wilson, Rob

doi:10.1007/s11284-013-1084-3

Cited by 16 publications

(15 citation statements)

References 47 publications

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“…The sensitivity of the lake-shore pines to precipitation, in addition to the positive summer temperature association, is likely linked to lake-level variability. Similar results were obtained by Helama et al (2013), comparing lake-shore and upland trees in Finland. However, in addition to positive associations with summer temperature, they found a strong negative impact of winter precipitation on lake-shore trees.…”

Section: Tree-rings and Climate-present Daysupporting

confidence: 86%

“…Discrepancies between pines from respective environments have been noted in studies based on living trees (Düthorn et al, 2013;Helama et al, 2013). Although no attempts have been made to assess this relationship further back in time, our unique treeline data, covering parts of the last millennium, made it possible to assess the nature of this relationship back in time.…”

Section: Implications Of the Resultsmentioning

confidence: 92%

“…Moreover, the trees which will end up in the lakes have been growing on the shores of the lakes, and these lake-shore trees will be sensitive to local hydrological changes, such as varying lake water levels (Gunnarson et al, 2003). Two recent studies have shown differences in the climatic response of pines growing in lake-shore and dry environments (Düthorn et al, 2013;Helama et al, 2013). Thus, a chronology based predominantly on lake-shore trees (subfossil lake wood) back in time, may, due to local near-shore environmental growth influences or fluctuations in the thermal gradient, diverge from the general climate of the region.…”

Section: Introductionmentioning

confidence: 99%

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Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

et al. 2014

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Trees growing at their altitudinal or latitudinal distribution in Fennoscandia have been widely used to reconstruct warm season temperatures, and the region hosts some of the world's longest tree-ring chronologies. These multi-millennial long chronologies have mainly been built from tree remains found in lakes (subfossil wood from lake-shore trees). We used a unique dataset of Scots pine tree-ring data collected from wood remains found on a mountain slope in the central Scandinavian Mountains, yielding a chronology spanning over much of the last 1200 years. This data was compared with a local subfossil wood chronology with the aim to (1) describe growth variability in two environments during the Medieval Climate Anomaly (MCA) and the early Little Ice Age (LIA), and (2) investigate differences in growth characteristics during these contrasting periods. It was shown that the local tree-line during both the MCA and early LIA was almost 150 m higher that at present. Based on living pines from the two environments, tree-line pine growth was strongly associated with mid-summer temperatures, while the lake-shore trees showed an additional response to summer precipitation. During the MCA, regarded to be a period of favorable climate in the region, the tree-ring data from both environments showed strong coherency and moderate growth variability. In the early LIA, the two chronologies were less coherent, with the tree-line chronology showing more variability, suggesting different growth responses in the two environments during this period of less favorable growing conditions. Our results indicate that tree-ring width chronologies mainly based on lake-shore trees may need to be re-evaluated.

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Section: Tree-rings and Climate-present Daysupporting

confidence: 86%

Section: Implications Of the Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

et al. 2014

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“…Likely this is due to the local growth environment, where periodical shifts in lake levels may cause varying responses to temperature in the trees, as has been suggested for TRW (e.g. Düthorn et al 2013;Helama et al 2013, Linderholm et al 2014b). In addition to humidity, other factors such as forest composition, exposure to wind and light, aspect, terrain, etc., can also influence the microclimate.…”

Section: Discussionmentioning

confidence: 84%

The influence of elevational differences in absolute maximum density values on regional climate reconstructions

Zhang

Björklund

Linderholm

2015

Trees

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Key message We found that indiscriminately using tree-ring MXD data with inhomogeneous temporal distribution from different elevations might cause biased chronologies. A mean-adjusting method was developed to overcome this bias. Abstract Here we analyse maximum latewood density (MXD) of Pinus sylvestris L. (Scots pine), from deadwood (dry) and subfossil wood (from lakes) collected along an elevation gradient in and close to the central Scandinavian Mountains, in the province of Jämtland, Sweden. Focusing on two common time periods (900-1150 CE and 1300-1550 CE), the mean absolute MXD of deadwood samples showed an inverse relationship with elevation, i.e. the absolute MXD decreases with elevation. However, the MXD values of the subfossil samples did not show such a consistent relationship with elevation. It was also noted that the differences in mean absolute MXD values among sites of different elevations in a given period were larger than among sites of similar elevation between the two time periods, where the former was assumed to be warmer than the latter. Using a theoretical model and a real example, it was shown that indiscriminately using MXD data with inhomogeneous temporal distribution from different elevations may cause biased chronologies, which can have significant effects on subsequent interpretations of past climate variability. A mean-adjusting method was developed to overcome this bias, and its usefulness was demonstrated by comparing two chronologies built on mean-adjusted and unadjusted MXD samples. It was concluded that unadjusted samples from different elevations with inhomogeneous temporal distribution can distort the long-term trend in a final chronology, while this bias can be alleviated if mean-adjusted samples are used.

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“…in the eastern Iberian peninsula is function of differences in elevation and distance from the riverbank. Helama et al (2013) examined the dendroclimatic signals of riparian and upland pines forest interior in Finland, and showed that the former reacted negatively to increased rainfall in June, whereas the latter showed a positive response to the same climatic forcing. Dudek et al (1998) founded that differences in elevation modulate the response of Populus deltoids W. Bartram ex Humphry Marshall and Juglans nigra L. to streamflow and climate.…”

Section: Discussionmentioning

confidence: 99%

Assessing the Sensitivity of Riparian Algarrobo Dulce (<i>Prosopis flexuosa</i> DC) Radial Growth to Hydrological Changes

Piraino

Roig

2016

Geochronometria

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Ecotones, as for example riparian zones, have long interested ecologists, due to their potential role in generating species biodiversity and evolutionary novelty, as well as their sensitivity to environmental changes. Along riparian areas, vegetation is recognized for its ecological importance in several ecosystemic processes. In the Central Monte Desert (central-west Argentina), Prosopis flexuosa grows in territories characterized by a permanent access to water reservoirs, e.g. along riverbanks, where the species forms the classic gallery forests. Despite the ecosystemic role of the different Prosopis species distributed in arid lands, thus far no analysis has been conducted regarding the relation between their radial growth and hydrological changes, namely streamflow variability, in riparian settings. To fill this gap of knowledge, we performed a dendrochronological analysis considering several riparian P. flexuosa trees differing in their spatial position in relation to the riverbank. Pointer years, correlation function, and regression analyses show differences in the dendrohydrological signal of the studied species, probably function of tree distance from the river. In this sense, radial growth of trees distributed near the riverbank is tightly coupled to spring-summer (September to March) streamflow variability, whereas for farthest trees the ring development is driven by a combination of winter and spring river discharge and late-summer precipitation amount. The presented results demonstrate the potentiality of P. flexuosa, and in a broader sense of the Prosopis genus, in dendrohydrological studies.

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Dendroclimatic signals deduced from riparian versus upland forest interior pines in North Karelia, Finland

Cited by 16 publications

References 47 publications

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

The influence of elevational differences in absolute maximum density values on regional climate reconstructions

Assessing the Sensitivity of Riparian Algarrobo Dulce (<i>Prosopis flexuosa</i> DC) Radial Growth to Hydrological Changes

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