Wyniki wyszukiwania - Biblioteka Nauki

1

Chronology development and climate response analysis of Schrenk spruce (Picea schrenkiana) tree-ring parameters in the Urumqi River Basin, China

100%

Chen F. , Yuan Y. , Wei W. , Yu S. , Li Y. , Zhang R. , Zhang T. , Shang H.

|

2010

|

tom Vol. 36

17-22

EN

Seven different tree-ring parameters (total tree-ring width, earlywood width, latewood width, maximum latewood density, minimum earlywood density, average earlywood density, and average latewood density) were obtained from Schrenk spruce in the Urumqi River Basin, China. The chronologies were analyzed individually and then compared with each other. The relationships between the different tree-ring parameters and climate data (Daxigou) are also presented. Earlywoodrelated parameters (earlywood width, minimum density, and earlywood density) were more sensitive to climate than those of latewood. Temperature (July) was found to be the most strongly related to the earlywood density. Based on the results of climate response analysis, the potential of tree-ring chronologies from this species to provide climate reconstructions in the Urumqi River Basin has been established. This study demonstrates that the use of tree-ring density data can increase the climate information obtained from tree-ring and should lead to improved paleoclimate reconstructions in Central Asian.

2

Tree-ring chronologies of downy oak (quercus pubescens), pedunculate oak (q. Robur) and sessile oak (q. Petraea) in the Bielinek Nature Reserve : comparison of the climatic determinants of tree-ring width

88%

Cedro A.

Geochronometria

|

2007

|

tom Vol. 26

39-45

EN

In 2004-2006, 50 trees of downy oak (Quercus pubescens), pedunculate oak (Q. robur) and sessile oak (Q. petraea) were sampled in the Bielinek Nature Reserve. The following chronologies were established from their tree-ring series: OMS of 212 years (1793-2004) for downy oaks well as D10 of 183 years (1817-1999) and D13 of 211 years (1789-1999) for the two indigenous oak species pedunculate and sessile oak, respectively. These chronologies were used for signature years and response function analyses. All three chronologies were highly similar, which points to identical responses to the ambient meteorological conditions. The radial increment of downy oak depends primarily on the amount of precipitation. A high annual sum of precipitation, copious rain in springsummer in particular, results in wide tree rings. Precipitation in form of rain and snow in winter, too, enhance tree growth by raising the groundwater level and improving the water supply in the habitat during the subsequent spring. Droughts in spring and summer, coupled with high air temperature, result in narrow rings. The tree-ring width/climate relationships at the two indigenous oak species are very similar to those of downy oak. Responses are, however, more distinct and with a higher statistical significance.

3

Local chronologies and regional diversity of dendrochronological signal of Douglas fir in Poland

75%

Wilczyński S. , Feliksik E.

Geochronometria

|

2007

|

tom Vol. 26

69-80

EN

In Poland, 50 sites of Douglas fir were selected for which tree-ring chronologies were computed. Douglas fir in different parts of Poland has a specific increment rhythm, on the basis of which the four homogeneous dendrochronological zones were distinguished. The first zone (I) comprises Pomerania, Baltic coast, Warmia, and Mazuria (lowlands of northern Poland), the second zone (II) - Great Poland, Lower Silesia (lowlands of central Poland), the third zone (III) - the Sudetes and the Carpathian mountains, and the fourth zone (IV) - foothills of the Carpathians Mts., Roztocze, and the Świętokrzyskie Mts. (uplands of southern Poland). These areas are called the dendroclimatic zones because different thermo-pluvial conditions of the summer season were a cause of diversification of the Douglas fir increment rhythm, and in consequence of its chronology. A high similarity of site chronologies of a given region permitted to construct regional tree-ring chronologies for respective zones. Thermal conditions of the winter season (February - March) were the factor most strongly and similarly affecting radial increment of Douglas fir populations in the entire territory of Poland. This factor caused that all chronologies showed many similar traits in their progress. This fact permitted to construct the supra-regional (all-Polish) tree-ring chronology for this tree species. It comprises the period from 1900 to 2000, and it is a good standard for dating Douglas fir wood samples originating from the area of Poland.

4

Tree-ring chronology as a source of information on susceptibility of Sitka spruce to climatic conditions of Pomerania (Northern Poland)

75%

Feliksik E. , Wilczyński S.

Geochronometria

|

2008

|

tom Vol. 30

79-82

EN

This paper presents results concerning climatic conditions affecting diameter growth of Sitka spruce introduced to Baltic Pomerania (Sławno Forest District). A relatively high homogeneity of tree-ring series permitted to construct on their basis the tree-ring chronology of Sitka spruce. A significant positive correlation was found between radial increments of Sitka spruce and air temperatures of winter and spring months (January-April) and a negative relationship between radial increments and temperature of May. This study also showed a distinctly positive correlation between diameter growth and precipitation in July and November of the previous year, and precipitation in February and in summer season (June-August) of the current year. During years with low precipitation in summer or low temperatures in winter and spring all trees produced narrow tree-rings. The proportion of air temperature and precipitation in variation of radial increment of Sitka spruce, expressed by the coefficient of multiple determination, was 52%.

5

Influence of climate on radial growth of Holm Oaks (Quercus ilex subsp. ballota Desf) from sw Spain

63%

Patón D. , García-Herrera R. , Cuenca J. , Galavis M. , Roig F. A.

|

2009

|

tom Vol. 34

49-56

EN

A total of 47 trunk sections from Holm Oak (Quercus ilex subsp. ballota Desf) trees growing at two different sites at the Extremadura region (SW Spain) were considered in the computation of a regional tree-ring chronology useful to interpret the tree-ring/Mediterranean climate relationships. This is the first dendroclimatological research of Holm Oaks conducted to reveal its potential use as a climatic proxy. The obtained tree-ring chronologies were compared with climatic parameters based on monthly, seasonal and annual rainfall, and monthly maximum, minimum and average temperature. The best correlations were obtained with maximum temperatures during the period between previous winter and early spring. Influence of rainfall was less relevant. Growth of this species indicates a typical bimodal (spring and autumn) strategy that avoids low winter temperatures and summer drought. Despite some technical difficulties recognizing tree rings in Holm Oaks, its good sensitivity to climate variability and its wide distribution and longevity (∼ 800 years), allow us to consider this species as a good candidate for temperature reconstructions in the Mediterranean Basin.

6

Rekonstrukcja paleoklimatu Małopolski na podstawie sekwencji przyrostów rocznych dębów

63%

Krawczyk A. J. , Krąpiec M.

|

1999

|

tom T. 25, z. 4

305-319

PL

Analiza dendroklimatyczna, przeprowadzona na podstawie sekwencji przyrostów dębów z Małopolski (1590-1997 AD) i zarejestrowanych w Krakowie w ostatnim stuleciu danych klimatycznych wykazała, że na szerokość przyrostów rocznych dębów wpływa przede wszystkim wielkość opadów na przełomie wiosny i lata (maj? - czerwiec - lipiec), a w mniejszym stopniu - także temperatura późną wiosną (maj). Mimo silnego tłumienia tego wpływu przez czynniki nieklimatyczne można z krzywej dendrochronologicznej odczytać przybliżone okresy występowania wilgotniejszych i cieplejszych miesięcy wiosenno-letnich oraz okresy występowania mniejszych opadów i niższych temperatur późną wiosną i wczesnym latem. Wiarygodność takich interpretacji potwierdzają obliczenia dla okresów, dla których istnieją dane klimatyczne

EN

Dendroclimatical analysis, carried out on the basis of growth patterns of oaks from the area of Małopolska (1590-1997 AD) and the climatic record registered in Cracow in the last century, indicate that the annual growth widths mostly depend on amount of rainfall at the turn of spring and summer (May? - June - July), and in a lesser degree - on temperatures in late spring (May). In spite of heavy extinguishing of climatic influences by other factors, the dendrochronological curve enabled to determine approximate periods of more humid and warmer spring-summer months, as well as periods characterized by lower rainfall and temperatures in late spring and early summer. Credibility of this interpretation is confirmed by data for periods with registered climatic record