地理科学 ›› 1991, Vol. 11 ›› Issue (2): 109-117,197.doi: 10.13249/j.cnki.sgs.1991.02.109

• 论文 • 上一篇    下一篇

我国农业气候带的振动及其对农业生产的冲击

卢其尧   

  1. 南京大学大气科学系
  • 出版日期:1991-03-20 发布日期:1991-03-20

FLUCTUATION OF AGROCLIMATIC ZONES AND ITS IMPACT ON AGRICULTURAL PRODUCTION IN CHINA

Lu Qiyao   

  1. Department of Atmospheric Science, Nanjing University
  • Online:1991-03-20 Published:1991-03-20

摘要: 10℃以上积温(Σt)和年最低温度(Tm)是划分农业气候带的主要指标。本文计算了我国Σt和Tm的重现期、以及不同重现期Σt和Tm等值线的南北位移,讨论了凉夏年和冷冬年农业气候带的振动及其对农业生产的可能冲击。

Abstract: Accumulated temperature above 10℃(Σt) and annual minimum temperature(Tm) are the major indexes for demarcating agroclimatic zones. The return period(τ) of Σt and Tm and the shift of Σt-and Tm-isopleths with τ are calculated. 1. According to the magnitude of shift of Σt-and Tm-isopleths, in northeast China, Inner Mongolia and north Xinjing the fluctuation of heat resources in growing season from year to year is the greatest and strongly influences the yield of annual thermophilous crops but in the Changjiang River basin the fluctuation of the low temperature in winter is the greatest and seriously injures the perennial subtropical tree crops. 2. In the anomalous cool summer year with τ=30, the northern boundaries of the southern subtropical, northern subtropical and warm temperate zones and the southern boundary of the frigid temperate zone in China could be expected to shift southward 150, 220, 250 and 300km from their normal positions, respectively. 3. In the anomalous cold winter year with τ=30, the northern boundaries of the tropical,southern subtropical, northern subtropical and warm temperate zones, and the southern boundary of the frigid temperate zone could be expected to shift southward 270, 150, 450, 290 and 350km from their normal positions, respectively, and the extremely low temperature seriously injure not only the subtropical tree crops in the Changjiang River basin as mentioned above, but also the tropical crops in South China,even Hevea brasiliensis in southern Yunnan.