Abstract
To explore the difference in the response of the radial growth of Pinus tabulaeformis and Picea crassifolia on different timescales to climate factors in the eastern part of Qilian Mountains, we used dendrochronology to select four different timescales (day, pentad (5 days), dekad (10 days), and month) for exploration. The primary conclusions were as follows: (1) According to an investigation of the dynamic correlations between radial growth and climate conditions, drought during the growing season has been the dominant limiting factor for radial growth across both species in recent decades; (2) climate data at the dekad scale are best for examining the correlations between radial growth and climate variables; and (3) based on basal area increment, P. tabuliformis in the study area showed a trend of first an increase and then a decrease, while P. crassifolia showed a trend of continuous increase (BAI). As the climate continues to warm in the future, forest ecosystems in arid and semi-arid areas will be more susceptible to severe drought, which will lead to a decline in tree growth, death, and community deterioration. As a result, it is critical to implement appropriate management approaches for various species based on the peculiarities of their climate change responses.
Highlights
Received: 18 October 2021AR6 points out that based on historical observations and model simulations in the21st century, land warming at the global scale has increased the demand for atmospheric evaporation and the intensity of drought events
The results show that the radial growth of P. tabulaeformis was significantly positively correlated with the drought index at different timescales in the growing season, but there was no significant correlation between the radial growth of P. crassifolia and the drought index
We found that there isofa the significant correlation between the radial growth of P. on tabuliTimescales formis and precipitation in the study area, and the response of P. crassifolia to precipitation onlyWe appears onthat a smaller (Figures 4–7)
Summary
21st century, land warming at the global scale has increased the demand for atmospheric evaporation and the intensity of drought events. The increase in land temperature was higher than that in the ocean, which affected the atmospheric circulation and reduced the relative humidity near the surface, leading to the occurrence of regional drought events [1]. Fewer studies have looked at indirect effects, such as how climate change affects the forest structure and composition, which has an impact on species presence and abundance [3]. A warming climate may trigger drought events, and in dry regions, trees have a reduced ability to absorb water due to reduced xylem carbohydrates, leading to reduced growth [5,6]. Different forest species in different regions show different ecological adaptation
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