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Climatic response of tracheid features of Picea meyeri along altitude gradient of Luyashan Mountains of North China

100%

Wang M., Jiang Y., Zhang W., Dong M., Kang M., Xu H.

Polish Journal of Ecology

2017

tom 65

nr 4

Changing localized environmental conditions along altitude gradients could modify the responses of tree xylem structures to climate variations. To explore how trees adapt to local environment and respond to climate variants, we analysed the variation of Picea meyeri xylem tracheid features and the relationships with climate variables along an altitude gradient (1970, 2240, 2490 and 2650 m above sea level) of the Luyashan Mountains in the North China. The results mainly indicated the following: (1) tracheid number and diameter of P. meyeri showed significant differences among the four sites along the altitude gradient; (2) trees at site 2 (2240 m) and site 3 (2490 m) are similar in age, but the xylem tracheid number and diameter of these trees were significantly different, which may indicate different functional adaptation; (3) the relationships between xylem features' residual chronologies and the monthly climate data were inconsistent along altitude gradients, which indicated that the limiting factor of P. meyeri growth along the altitude gradients, shifted from drought stress at lower altitudes to low-temperature stress at higher altitudes.

Effect of alpine treeline conditions on the response of the stem radial variation of Picea meyeri Rebd. et Wils to environmental factors

67%

Dong M., Jiang Y., Zhang W., Yang Y., Yang H.

Polish Journal of Ecology

2011

tom 59

nr 4

Alpine treeline is an important ecological boundary, marked by a change in site conditions and plant communities when crossing the forest limit, and tree growth at treeline is strongly constrained by the harsh environment. Finer resolution studies of tree radial variation on short temporal scales can be useful to explore the main physical variables that trigger the radial growth. From 19th Oct. 2008 to 25th Oct. 2009, we continuously monitored the stem radial variation of Picea meyeri Rebd. Et Wils trees using point dendrometers, at the treeline of Luya Mountains (altitude 2700 m a.s.l.), North China. Our results showed that there were two reverse daily variation patterns in the warm and cold seasons, which were related to the daily transpiration course and daily stem freeze-thaw cycles, respectively. Annual stem radial growth of Picea meyeri was divided into the four distinct periods: 1) spring stem rehydration, 2) summer stem rapid growth, 3) autumn stem dehydration contraction and 4) winter stem stagnation. The stem radial variation of Picea meyeri at the alpine treeline was closely dependent on climate conditions. Soil temperature was the most important factor affecting radial growth, which determined the initiation of radial growth and the cambial activity during the growing season.

Ograniczanie wyników

2 Polish Journal of Ecology

2 Dong M.

2 Jiang Y.

2 Zhang W.

1 Kang M.

1 Wang M.

1 Xu H.

1 Yang H.

1 Yang Y.

1 2017

1 2011

Wyniki wyszukiwania

Climatic response of tracheid features of Picea meyeri along altitude gradient of Luyashan Mountains of North China

Effect of alpine treeline conditions on the response of the stem radial variation of Picea meyeri Rebd. et Wils to environmental factors