关键词: 南岭, 温度, 降水, 干旱, 撒哈拉沙漠, 阿拉伯半岛沙漠, 塔尔沙漠, 墨西哥荒漠

Abstract: Based on the observations of 91 meteorological stations and an atmospheric circulation model (CCSM3)，the climatic characteristic parameters of typical regions with the same latitude as the Nanling mountainous area were analyzed，the temperature and precipitation in different regions were forecasted until 2099，and the sensitivity of net primary productivity to temperature and precipitation was explored．We further explored the possible causes of climate difference in typical regions with the same latitude as the Nanling moutainous area．It has showed that arid and humid periods had different patterns among the studied regions．The Sahara Desert，the Arabian Desert and the Thar Desert only had an arid period，whereas both the Mexican Dryland and Nanling had a wet (moist and even humid) period．However，the seasons in which wet periods appeared was different between these two regions; Nanling had a rainy season during the spring and summer during plant growth，while the rainy season occurred in autumn in the Mexican Dryland．The potential evapotranspiration，wind speed and sunshine fraction of the Sahara Desert，the Arabian Desert and the Thar Desert were higher than those of the Mexican Dryland and Nanling，but the precipitation showed the opposite pattern．The water vapor pressure in the dry season of the Mexican Dryland was close to those of the Sahara Desert and the Arabian Desert but lower than the values for the wet season in the Mexican Dryland and those of the Thar Desert and Nanling．In the B1 climate scenario，a t-test of the temperature and precipitation data for every 20 years during the period 2000–2099 and 1981–2010 showed a significant upward trend (P＜0.001) in the future temperature of the five typical regions．In contrast，precipitation showed a significant decrease or significant increase in different proportions in different stages and regions，even though there was an increasing trend overall．The sensitivity of the net primary productivity to temperature was zero in all five studied regions，indicating that the precipitation is a limiting factor for all studied regions．The deserts of the Sahara Desert and the Arabian Desert were significantly more sensitive to precipitation than the Mexican Dryland，the Thar Desert and Nanling．In addition to climate change，the reasons for different climatic conditions in Nanling moutainous area and other regions with same latitude include probably the spatial position of each region to the ocean and land，disturbance of human activities，and the roughness of topography.

Key words: Nanling region, temperature, precipitation, drought, the Sahara Desert, the Arabian Desert, the Thar Desert, the Mexican Dryland