Abstract
In order to study temporal and spatial evolution of the precipitation concentration degree and period in Western Plains of Jilin during the crop growing season and then adjust irrigation strategy, this paper studied the spatial and temporal characteristics of precipitation. Results are as follows: In the growing season from nearly 35 years, the decrease of precipitation during the growing season contributed more to the reduction of interannual precipitation. The maximum precipitation and precipitation duration showed a slight downward trend whereas the minimum precipitation was reversed. Precipitation duration gradually increased from west to east. In the past 35 years, the precipitation concentration degree (PCD) decreased by linear function of “y = -0.0018x + 0.4655”, indicating that the precipitation exhibited a trend of balanced distribution. The PCD decreased from the northwest to the southeast. From the precipitation concentration period (PCP), it changed from early July to late July. In summary, it was important to strengthen the staged drought-preparedness contingency plans in the region.
Highlights
Precipitation is an important indicator when studying the extent of floods in an area
For the western plain of Jilin Province, the research on the spatial scale was very rare. It shows that the probability of concentrated precipitation or uniform precipitation in the future was very low, which was consist with the research on precipitation concentration degree in Songyuan city of Jilin province by Chi et al (2015)
The above data shows that in the western plain of Jilin Province, the change in concentration period is greater than the concentration degree, indicating that changes in precipitation concentration degree (PCD) were relatively stable, but precipitation concentration period (PCP) would shift from June to July
Summary
Precipitation is an important indicator when studying the extent of floods in an area. The interannual precipitation in the western plain of Jilin Province is unevenly distributed in time and space, accounting for about 70% of the annual precipitation (Liu et al, 2015). These research methods can indicate basic state and change of precipitation in a certain extent, they cannot highlight the characteristics of maximum or minimum precipitation and precipitation concentration degree in a certain period. The latter is very important in studying climate disasters such as droughts or heavy rains and floods (Li and Qian, 2006).
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