Dendroclimatological investigation of mainland Australia's only alpine conifer, Podocarpus lawrencei Hook.f

McDougall, Keith L.; Brookhouse, Matthew; Broome, Linda

doi:10.1016/j.dendro.2011.01.011

Cited by 20 publications

(31 citation statements)

References 42 publications

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“…The main climatic signal was related to previous November conditions, indicating that a warm and dry late spring is beneficial for growth of P. salignus in Valdivia. This response is consistent with those of P. lawrencei in Australian alpine areas, which showed a positive response to maximum temperature and negative to precipitation in previous October and November (McDougall et al, 2012). A similar response has been described for Pinus canariensis C. Sm.…”

Section: Discussionsupporting

confidence: 77%

“…Statistics of P. salignus chronologies were lower than statistics from the alpine species P. lawrencei Hook.f. in Australia (McDougall et al, 2012), suggesting a lower climatic sensitivity of growth in Valdivia than in mountain regions.…”

Section: Discussionmentioning

confidence: 99%

“…Dendrochronological research on Podocarpus species is scarce as a consequence of inherent difficulties associated with poorly-defined tree-ring boundaries, lobate growth, ring wedging, and multiple or missing rings (Norton & Ogden, 1990;Bauch et al, 2006;Krepkowski et al, 2011;McDougall et al, 2012). These traits hamper effective cross-dating among tree-ring series from coexisting trees, and even from the same tree.…”

Section: Introductionmentioning

confidence: 99%

“…(Lamprecht, 1984;Sweda & Inoue, 1987), but no clear statistical links with climate were found. However, recent studies have shown that tree-ring series measured on stem cross sections of Podocarpus can be successfully cross-dated and significant correlations of the resulting chronologies with climate can be calculated (Krepkowski et al, 2012;McDougall et al, 2012). The use of cross sections has been recommended to overcome the difficulties for tree-ring cross-dating typical of Podocarpus sp.…”

Section: Introductionmentioning

confidence: 99%

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Climate and growth of Podocarpus salignus in Valdivia, Chile

Rozas¹,

Quesne²,

Muñoz³

et al. 2016

Dendrobiology

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Little dendroclimatic research has been conducted on species of Podocarpus, in response to inherent difficulties associated with tree-ring differentiation and cross-dating. We sampled complete stem cross sections from a plantation of Podocarpus salignus trees in Valdivia, Chile, near the southern edge of the species' range. We measured earlywood, latewood, and total ring widths avoiding ring wedging, and we calculated the corresponding chronologies. The relationship of these chronologies with maximum temperature, precipitation, and sea level pressure was addressed using correlation and redundancy analyses. All chronologies showed a similar response to climate that was consistent with the cloudy, rainy, and temperate conditions of the study area. That is, warm and dry conditions during previous late springs were beneficial, while warm and rainy winters under low atmospheric pressures were detrimental for growth. The observed climatic responses are in contrast to those of conifers from mountainous areas of southern South America. Limitation of carbohydrates available for growth in the following active season was a possible cause for the observed responses to climate. That is, high winter temperatures may deplete stored carbohydrates by increasing respiration, and a high degree of cloud cover reduces the radiation received by the trees in the active season, which may hamper photosynthesis. Our work highlights the dendroclimatological value of Podocarpus salignus to investigate the influence of climatic variation on tree growth and forest productivity.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Climate and growth of Podocarpus salignus in Valdivia, Chile

Rozas¹,

Quesne²,

Muñoz³

et al. 2016

Dendrobiology

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“…Several recent studies have documented significant positive correlations between ring widths or shoot lengths and early and mid growing season temperatures for some of the most common tall [23,25,27,34,65] and dwarf [66][67][68][69][70] shrub species found in tundra ecosystems. In some studies, winter temperatures and snow have been found to correlate with growth in the following summer [27,[71][72][73].…”

Section: Temperaturementioning

confidence: 99%

Shrub expansion in tundra ecosystems: dynamics, impacts and research priorities

Myers‐Smith

Forbes

Wilmking

et al. 2011

Environ. Res. Lett.

1,176

1,279

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Recent research using repeat photography, long-term ecological monitoring and dendrochronology has documented shrub expansion in arctic, high-latitude and alpine tundra 1 1748-9326/11/045509+15$33.00 c 2011 IOP Publishing Ltd Printed in the UK Environ. Res. Lett. 6 (2011) 045509 I H Myers-Smith et al ecosystems.Here, we (1) synthesize these findings, (2) present a conceptual framework that identifies mechanisms and constraints on shrub increase, (3) explore causes, feedbacks and implications of the increased shrub cover in tundra ecosystems, and (4) address potential lines of investigation for future research. Satellite observations from around the circumpolar Arctic, showing increased productivity, measured as changes in 'greenness', have coincided with a general rise in high-latitude air temperatures and have been partly attributed to increases in shrub cover. Studies indicate that warming temperatures, changes in snow cover, altered disturbance regimes as a result of permafrost thaw, tundra fires, and anthropogenic activities or changes in herbivory intensity are all contributing to observed changes in shrub abundance. A large-scale increase in shrub cover will change the structure of tundra ecosystems and alter energy fluxes, regional climate, soil-atmosphere exchange of water, carbon and nutrients, and ecological interactions between species. In order to project future rates of shrub expansion and understand the feedbacks to ecosystem and climate processes, future research should investigate the species or trait-specific responses of shrubs to climate change including: (1) the temperature sensitivity of shrub growth, (2) factors controlling the recruitment of new individuals, and (3) the relative influence of the positive and negative feedbacks involved in shrub expansion.

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Rock outcrops reduce temperature-induced stress for tropical conifer by decoupling regional climate in the semiarid environment

2015

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We aimed to understand the effect of rock outcrops on the growth of Podocarpus lambertii within a microrefuge. Our hypothesis holds that the growth and survival of this species depend on the regional climate decoupling provided by rock outcrops. To test this hypothesis, we characterized the microclimate of (1) surrounding vegetation, (2) rock outcrop corridors, and (3) adjacencies. We assessed population structure by collecting data of specimen stem diameter and height. We also assessed differences between vegetation associated or not with outcrops using satellite imaging. For dendrochronological analyses, we sampled 42 individuals. Tree rings of 31 individuals were dated, and climate-growth relationships were tested. Rock outcrops produce a favorable microclimate by reducing average temperature by 4.9 °C and increasing average air humidity by 12 %. They also reduce the variability of atmospheric temperature by 42 % and air humidity by 20 % supporting a vegetation with higher leaf area index. Within this vegetation, specimen height was strongly constrained by the outcrop height. Although temperature and precipitation modulate this species growth, temperature-induced stress is the key limiting growth factor for this population of P. lambertii. We conclude that this species growth and survival depend on the presence of rock outcrops. These topography elements decouple regional climate in a favorable way for this species growth. However, these benefits are restricted to the areas sheltered by rock outcrops. Although this microrefuge supported P. lambertii growth so far, it is unclear whether this protection would be sufficient to withstand the stress of future climate changes.

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Dendroclimatological investigation of mainland Australia's only alpine conifer, Podocarpus lawrencei Hook.f

Cited by 20 publications

References 42 publications

Climate and growth of Podocarpus salignus in Valdivia, Chile

Climate and growth of Podocarpus salignus in Valdivia, Chile

Shrub expansion in tundra ecosystems: dynamics, impacts and research priorities

Rock outcrops reduce temperature-induced stress for tropical conifer by decoupling regional climate in the semiarid environment

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