JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (3): 466-479.doi: 10.11849/zrzyxb.2014.03.010

• Resources Evaluation • Previous Articles     Next Articles

Spatial and Temporal Distribution of Variation in Heat Resource over Northeast China during the Period from 1960 to 2011

LIANG Hong1, WANG Pei-juan2, ZHANG Jian-cheng3, LI Yi-jun4   

  1. 1. Meteorological Observation Center, China Meteorological Administration, Beijing 100081, China;
    2. Chinese Academy of Meteorological Science, Beijing 100081, China;
    3. China Meteorological Administration, Beijing 100081, China;
    4. National Meteorological Center, China Meteorological Administration, Beijing 100081, China
  • Received:2012-11-30 Revised:2013-03-29 Online:2014-03-20 Published:2014-03-20

Abstract:

Northeast China (NC) is an important commodity grain base with strategic role in China. The variations of heat resources and their influences on agriculture in this region are greatly of concern under global warming conditions. Here the spatial and temporal distributions of variations and trends in heat resources are analyzed using datasets including homogeneous daily mean and minimal air temperature observations at 88 sites in NC during the period from 1960 to 2011. The Kendall-Theil robust line method is employed to estimate the slopes of the daily mean and minimal air temperature time series. The results show that accumulated temperature steadily above 0 ℃ increased by 25-95 ℃·d/10 a. The magnitude of increasing trends of the accumulated temperature in Three Rivers Plain area in NC are obviously larger than corresponding values in eastern mountain regions. The starting dates have been brought forward significantly in northern region (including Heilongjiang Province and Hulunbeier city and Xinganmeng area in Inner Mongolia Autonomous Region) and central region (including Jilin Province) of NC. The end date has been delayed significantly in northern part of NC. The number of days in which daily mean temperature steadily above 0 ℃ significantly increased by 2-4 d/10 a in northern and central parts of NC. The starting date of frost-free period has been significantly advanced and end date significantly delayed over most of NC. The number of frost free days significantly increased by 3-5 d/10 a. The accumulated temperature steadily over 10 ℃ increased by 30-110 ℃/10 a. This change is more prominent in northern part of NC than that in the southern of NC. The beginning date of daily mean air temperature steadily over 10 ℃ has been brought forward significantly in northern part of NC. The end date of daily mean air temperature steadily over 10 ℃ has been delayed significantly in southern part of NC. The effective growing seasons have been significantly lengthened by 2-4 d/10 a in northern and central part of NC.

Key words: agro-meteorology, heat resource, Kendall-Theil robust line method, Northeast China

CLC Number: 

  • P467