关键词: 碳足迹, 时空变化, 气候变化, 陕西省

Abstract:

Global warming caused by carbon emissions would cause severe natural environment and social problems. Extensive work has been done in the area of carbon footprint and quite a few researches about Carbon footprint has been reported home and abroad as well as some improvements. However, there are also some shortcomings such as mainly focusing on carbon emissions, whereas, less involving in carbon sequestration. Shaanxi Province is an important province of western China, in recent years its economy has developed rapidly, but the carbon footprint of this province has not been reported. In this article, based on the method that recommended by "the 2006 IPCC Guidelines for National Greenhouse Gas Inventories" and Chinese" Guidelines for Provincial Greenhouse Gas Inventories", the study on spatio-temporal changes of carbon footprint is performed in Shaanxi Province. Results of the study show that during the period from 1995 to 2011,Shaanxi′s carbon footprint increased from 4 129.38×10⁴t to 22 460.23×10⁴t, or rose by 443.91%. The carbon footprints of 10 cities in Shaanxi Province can be divided into three types. It is always a carbon sink in southern Shaanxi, higher in northern Shaanxi and Weinan City, and yet lower in Guanzhong region excluding Weinan City. The carbon footprint per capita grew from 1.18 t to 5.95 t in the past 14 years in Shaanxi Province. Concerning the carbon footprint per capita of cities in Shaanxi Province, it is higher in northern Shaanxi, lower in Guanzhong regions, and negative in southern Shaanxi. For example, it ranges as Yulin City,Yan'an City, Weinan City, Tongchuan City, Xianyang City, Baoji City, Xi'an City, Hanzhong City, Ankang City and Shangluo City in descending order according to the carbon footprint per capita in 2009. As regards the carbon footprint per unit area, it increased from 2.00 t/hm² to 10.90 t/hm² in the whole province. Besides, the carbon footprint per capita and per unit area in Shaanxi Province is higher than the target which set for control of global climate change, whereas widely different in space distribution. For instance, the carbon footprint per capita is 2.98 times higher than the target set for control of global climate change in Shaanxi Province in 2009, and furthermore the data in northern Shaanxi is more than 10 times, which is higher than that of the United States, yet 1.29-4.57 times in Guanzhong region. In 2009, the carbon footprint per unit area in Shaanxi Province is 4.98 times higher than the target set for control of global climate change. In particular, it is up to 9.63-16.95 times in Weinan City, Xianyang City and Xi'an City, and yet 3.45-7.10 times in Yulin City, Tongchuan City, Yanan City and Baoji City. Vegetation carbon sequestration is strong in southern Shaanxi, so there is a surplus of carbon sinks besides eliminating the local carbon emissions. Due to the high carbon footprint in Guanzhong regions and northern Shaanxi, it plays a negative impact on climate change, leaving a tough task of carbon emission reduction in Shaanxi Province.

Key words: carbon footprint, spatio-temporal changes, climate change, Shaanxi Province