地理科学 ›› 1993, Vol. 13 ›› Issue (4): 297-306,391.doi: 10.13249/j.cnki.sgs.1993.04.297

• 论文 •    下一篇

关于中国热带的北界

丘宝剑   

  1. 中国科学院、国家计划委员会地理研究所, 北京 100101
  • 收稿日期:1992-09-01 出版日期:1993-07-20 发布日期:1993-07-20

THE NORTHERN BORDER OF TROPICAL ZONE IN CHINA

Qiu Baojian   

  1. Institute of Geography, Academia Sinica and the State Planning Commission, Beijing 100101
  • Received:1992-09-01 Online:1993-07-20 Published:1993-07-20

摘要: 从农业气候学角度论,热带应是水稻等喜温作物全年都能生长,橡胶等木本作物没有严重寒害的地方,气候指标为年极端最低气温多年平均值>5℃,最冷月平均气温>15℃。我国冬季风太强、太冷,热带位于世界热带的北缘,北界不宜定得太北,以在雷州半岛北端为宜。

Abstract: This paper makes comment on the article“The extent of tropical zone in China”in Vol.11,No.2 of this journal. The tropics,subtropics and temperate zone are divided by temperature indices.Temperature is only one of the climatic elements.Climatic zones are also divided by the other climatic elements.Their extents and borders are very different to each other.Many climatologists do not agree the temperature zones.It is difficult that all of biogeographers,pedogeographers and physical geographers agree to temperature zones. When subdividing physical geographical zone,it should be comprehensively considered to all factors of physical geography,especially the factor of climate.It is not enough to consider the factors of vegetation and soil. The author considers that thermophilous crop,such as rice can be cultivated in whole year,and tropical woody plants,such as rubber tree do not suffer from freeze in tropical zone.The northern boundary of tropical zone coincides with 15℃ isotherm of the coldest month,and 5℃ isotherm of the mean annual minimum.Because the winter monsoon is very strong and very cold in China,so the Chinese tropics situates in the edge of world tropics,its boundary line should not lie too north,but in north of Leizhou Peninsula.