摘要
为充分利用什邡农业气候资源、合理安排农业生产提供科学依据,笔者利用什邡1961—2012年逐月、逐年日照时数及相关要素等资料,采用统计学、Mann-Kendall法等方法,研究分析什邡近52年日照时数变化特征及其原因。结果表明:(1)年日照时数整体呈明显减少趋势,气候倾向率达-47.3 h/10 a;从21世纪初开始有显著减少趋势;夏季减少趋势最显著,气候倾向率达-27.9 h/10 a;月日照时数变化呈单峰特征。(2)年、夏、冬季日照时数检测到突变点,均呈显著减少趋势。(3)年日照时数与晴天日数、降水量呈正相关,与平均气温呈负相关;日出、日落时段日照时数明显减少与日出、日落方向障碍物增多、仰角增大有关。
To provide scientific basis for the use of agro- climatic resources in Shifang and the reasonablearrangement of agricultural production, based on methods such as Mann-Kendall model and statistics as wellas the monthly and yearly data of sunshine duration and the related factors in Shifang from 1961 to 2012, theauthor studied the variation characteristics of sunshine duration in that period. The result showed that：（1） theannual sunlight ratio demonstrated a significant reduction on the whole（tendency rate：- 47.3 h/10 a）, whichwas patently seen from the beginning of the 21 st century and was mostly significant in summers with thetendency rate of-27.9 h/10 a; and the variation of monthly sunshine hours was characterized by a single peak;（2） the sunshine duration showed an abrupt change（significant reduction） in summers and winters as well as ona whole-year scale;（3） the annual sunlight ratio was positively correlated with the number of sunny days andthe amount of precipitation, and negatively correlated with the average temperature; the significant reduction ofsunshine hours at sunrise and sunset was relevant to the increase of obstacles and angle of elevation.
出处
《中国农学通报》
2015年第34期264-268,共5页
Chinese Agricultural Science Bulletin
关键词
什邡
日照时数
突变
气候变化
原因分析
Shifang
sunshine hours
mutation
climate change
cause analysis
