JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (8): 1361-1372.doi: 10.11849/zrzyxb.2013.08.009

• Resources Evaluation • Previous Articles     Next Articles

Impact of Climate Warming on the Distribution of Thermal Resources in the Lower-middle Reaches of the Changjiang River

ZHANG Li-bo1, LOU Wei-ping2   

  1. 1. Shaoxing Meteorological Bureau of Zhejiang Province, Shaoxing 312000, China;
    2. Xinchang Meteorological Bureau of Zhejiang Province, Xinchang 312500, China
  • Received:2012-03-20 Revised:2012-11-06 Online:2013-08-20 Published:2013-08-19

Abstract: Based on the daily average air temperature data from 90 meteorological stations in the lower-middle reaches of the Changjiang River from 1960 to 2010, the temporal and spatial variation characteristics of accumulated temperature steadily above 0 ℃ and 10 ℃, their lasting days, the beginning and ending date over recent 51 years were identified by using linear trend estimation, so as to find out the impact of climate warming on the distribution of thermal resources in the lower-middle reaches of the Changjiang River. The results showed that the air temperature increased continuously in the lower-middle reaches of the Changjiang River, and the regression coefficient of annual average air temperature was 0.21 ℃/10 a, the trend coefficient was 0.63(P<0.001), a slight lower than China during the same period, and it was well correlated with the other thermal resources indexes(P<0.05). The lasting days steadily above 0 ℃ and 10 ℃ increased generally in the lower-middle reaches of the Changjiang River along with climate warming, the accumulated temperature steadily above 0 ℃ and 10 ℃ increased significantly during the same period. The widespread increase of the accumulated temperature steadily above 0 ℃ and 10 ℃ and their lasting days was influenced by the beginning date advancing and the ending date delaying. Furthermore the influence of the beginning date advancing was more obvious than that of the ending date delaying. The north subtropical zone and middle subtropical zone have moved greatly northward in the lower-middle reaches of the Changjiang River since the 2000s, the northern boundary of north subtropical zone has moved out of the lower-middle reaches of the Changjiang River before the 1990s, the northern boundary of middle subtropical zone moved to near 32°N, i. e., 2-3 degrees of latitude northward, compared to the period 1960-1999. The northern limits of the three-cropping systems and the cultivable areas for double harvest rice moved northward obviously after the 1990s, and the mean movement magnitude was bigger than two latitude distance in comparison with the 1960s.

Key words: the lower-middle reaches of the Changjiang River, cropping system, accumulated temperature

CLC Number: 

  • P467