Response of Soil Temperature of 20 cm Depth to Air Temperature and Precipitation in Tibet from 1971 to 2013
The paper aims to fully understand the influence of climate change on soil temperature of 20 cm depth of the cultivated land in Tibet, and to provide a scientific basis for protecting ecological environment and sustaining the development of farming and animal husbandry.Responses of soil temperature to air temperature and precipitation were investigated in this paper with the observational data from 8 representative meteorological stations during the period of 1971-2013.The results showed that the air temperature and the soil temperature of 20 cm depth increased significantly in western and central Tibet than that in eastern Tibet,presented a significant warming trend, and the rise of the air temperature and the soil temperature in each season and of the year also showed the same regional characteristics.The air temperature and the soil temperature were significantly higher in spring and winter than that in other seasons.It was found that the annual and seasonal air temperature and soil temperature of 20 cm depth were lower than the standard value in 1970s and 1980s, while normal in 1990s, and significantly higher than the standard value in the first decade of the 21st century, anomaly of warming in western and central Tibet was bigger than that in eastern Tibet.The study also found that there was an extremely and significantly positive correlation (P＜0.01) between the annual soil temperature, the soil temperature of the rainy season, the soil temperature of the dry season and the air temperature of the same period.It was found that the correlation in the rainy season was greater than that in the dry season, and there was a significantly negative correlation between soil temperature and precipitation in the central and eastern Tibet in the rainy season (P＜0.05), and the correlation between soil temperature and air temperature and precipitation in the rainy season were higher than that in the dry season.
soil temperatureannual and decadal variationsabrupt change of climateMann-Kendall test
NETL
NSTL
万方数据
维普
