Elevational patterns of temperature and humidity in the middle Tianshan Mountain area in Central Asia Elevational patterns of temperature and humidity in the middle Tianshan Mountain area in Central Asia

最小化 最大化

Vol17 No.2: 397-409

Title】Elevational patterns of temperature and humidity in the middle Tianshan Mountain area in Central Asia

Author】Gheyur GHEYRET1#; Anwar MOHAMMAT2#; TANG Zhi-yao1*

Addresses】1 Institute of Ecology, College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China; 2 Key Laboratory of Biogeography and Bioresources in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011 China

Corresponding author】TANG Zhi-yao

Citation】Gheyret G, Mohammat A, Tang ZY (2020) Elevational patterns of temperature and humidity in the middle Tianshan Mountain area in Central Asia. Journal of Mountain Science 17(2). https://doi.org/10.1007/s11629-019-5481-0

DOI】https://doi.org/10.1007/s11629-019-5481-0

Abstract】The vertical distribution of vegetation types along an elevational gradient in mountain areas largely depends on the elevational changes in air temperature and humidity. In this study, we presented the seasonal and diurnal variations in the elevational gradients of air temperature and humidity on the southern and northern slopes in the middle Tianshan Mountain Range using data collected throughout the year via HOBO data loggers. The measurements were conducted at 12 different elevations from 1548 to 3277 m from September 2004 to August 2005. The results showed that the annual mean air temperature decreased along the elevational gradients with temperature lapse rates of (0.71±0.20)°C/100 m and (0.59±0.05)°C/100 mon the northern and southern slopes, respectively. The annual mean absolute humidity significantly decreased with increasing elevation on the northern slope but showed no significant trend on the southern slope. The annual mean relative humidity did not show a significant trend on the northern slope but increased with increasing elevation on the southern slope. The mean air temperature lapse rate exhibited significant seasonal variation, which is steeper in summer and shallower in winter, and this value varied between 0.37°C/100 m and 0.75°C/100 m on the southern slope and between 0.30°C/100 m and 1.02°C/100 m on the northern slope. The mean absolute and relative humidity also exhibited significant seasonal variations on both slopes, with the maximum occurring in summer and the minimum occurring in winter or spring. The monthly diurnal range of air temperature on both slopes was higher in spring than in winter. The annual range of air temperature on the southern slope was higher than that on the northern slope. Our results suggest that significant spatiotemporal variations in humidity and temperature lapse rate are useful when analyzing the relationships between species range sizes and climate in mountain areas.

Keywords】Temperature lapse rate; Absolute humidity; Relative humidity; Annual range of temperature; Diurnal range of temperature; HOBO data loggers