RELATIONSHIPS BETWEEN THE CLIMATE CHANGE AND THE

GRAIN FILLING OF WINTER WHEAT

 

ZHAOTANG SHANG^1,2, SHUN SHANG³, JIAN YU⁴, JING WU⁵ AND DONG JIANG^1*

 

¹College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China

²Jiangsu Meteorological Bureau, Nanjing 210009, China

³National Marine Environment Forecasting Center, Beijing100081, China

⁴Haian county Meteorological Bureau, Haian 226600, China

⁵College of marinesclences, Shanghai Ocean University, Shanghai 201300, China

^*Corresponding author’s email: dongjiangdc@163.com; Tel./Fax：+86 25 86452323

 

Abstract

 

The present study is based on the material in a grain filling rate experiment of winter wheat and hourly weather data organised by Xinghua city of Jiangsu Province. The aims are to objectively evaluate the possible influences of the temperature, precipitation, sunshine at the different time of the same day on the grain filling rate of winter wheat. The grain filling rate evaluation model of climate change is firstly developed, and then, the model calculation results are compared with the observed data. The along the changes of the microclimate, changes of the grain filling rate of winter wheat, which is not same in the gradual, rapid and slow increase stages. The changes in grain filling rate of winter wheat, which were caused by variations of temperature, precipitation and sunshine duration, showed periodic fluctuation. Variation in temperature resulted in 1.36 g·d⁻¹·(10a)⁻¹ of grain filling rate change; variation in precipitation resulted in −1.35 g·d⁻¹·(10a)⁻¹ of grain filling rate change; and variation in sunshine duration resulted in 0.07 g·d⁻¹·(10a)⁻¹ of grain filling rate change. Three samples showed a grain filling rate change of 0.08 g·d⁻¹·(10a)⁻¹. These findings indicate that the increase in temperature and sunshine duration caused the elevation of grain filling rate, whereas the increase in precipitation decreased the grain filling rate. Therefore, monitoring and predication capability of Meteorological disasters, such as drought caused by high temperature, should be strengthened to ensure the favourable weather condition and improve the grain filling rate through scientific methods such as artificial precipitation.

 

Key words: Microclimate; Grain filling rate; Precipitation; Sunshine duration.