Change Characteristics of Rice Climate Resources of Past 50 Years in Sichuan Basin Area
In order to provide a science-based reference for decision-making of rice product in responding to climate changes in Sichuan Basin,a research was conducted,in which GIS technology,the linear trend method,Mann-Kendall mutation detection and Morlet wave analysis were used to make a detailed study of spatial distribution and climate variation,based on the data of 105 meteorological observation stations of Sichuan Basin from 1961 to 2012.Results:1) The heat and sunshine resources of rice growing season decreased from southeast to northwest,and the precipitation was less in the basin,and increased from the basin to the edge of the basin.2) The start date of 12℃ showed an early trend,the end date of 22℃ showed a delay trend,the number of days and accumulated temperature of rice safety growth season showed an increasing trend,sunshine hours and precipitation were of decreasing trends.3) Inter annual variability of rice climate resources had obvious periodicity,but there were different variation periods for different elements.Such as 18～20 year cycle time for 12℃ beginning date,and 4～6 year and 8～12 year cycle time for 22℃ ending date,about 10 year and 18 year for the days and accumulated temperature of security growing season of rice respectively,and 5 year and 25 year for sunshine and 8 year and about 20 year for rainfall.4) Except precipitation,other elements of climate resources of rice had obvious mutation,but the different mutations point for different elements.The mutations point of beginning date of 12℃ was in 2000,the ending date of 22℃ was in 1995,the days and accumulated temperature and sunshine was in 1999,1999 and 1980 respectively,and mutations were more strong.
NETL
NSTL
万方数据
维普
