Spatial-temporal distribution of climatic suitability of summer maize in Anhui province
Received date: 2013-12-23
Request revised date: 2014-04-07
Online published: 2014-08-10
Copyright
Summer maize is one of the major crops in Anhui province, and the annual planting area is more than 0.67 million hectares. The growth and development of summer maize are affected by comprehensive meteorological factors, such as temperature, precipitation and sunshine hours. According to 60 meteorological stations with climatic records from 1961 to 2010 in Anhui province, and on the basis of the physiological characteristics of summer maize and existing research results, we constructed the suitability models of summer maize about temperature, precipitation and sunshine hours. The suitability index of temperature, precipitation and sunshine hours were calculated which can characterize different meteorological element suitability. Based on the relationship between single factor suitability index and summer maize yield, climatic suitability index model was set up by the weighted-average method. The climatic suitability index can express synergetic effect of meteorological factors and yields. The change trends of temperature, precipitation, sunshine hours and their suitability were analyzed. The change trends of climatic suitability index were emphatically analyzed. The results showed that there were significant correlation between suitability indexes and summer maize yield, and suitability indexes can objectively reflect the suitability of meteorological factors. The average temperature in the whole growth period of summer maize showed an increasing trend but not significantly, and the precipitation showed a similar trend. But in different growth stages, the average temperature and precipitation had different trends. The sunshine hours showed an obvious downward trend in different growth stages. In the whole growth period of summer maize, the temperature suitability index showed an advance trend, and the precipitation suitability index showed a downward trend, but these change trends were not significant. The sunshine suitability index showed an obvious downward trend in different growth stages. The precipitation suitability index was lower than temperature suitability index and sunshine suitability index, and the precipitation was a limiting factor. The climatic suitability index showed an obvious downward trend in the whole growth period of summer maize, and it decreased by 0.025 every ten years. In different growth stages, the climatic suitability index showed an obvious downward trend too. The descending rate of climatic suitability index at the seedling stage was the highest. The spatial distribution of climatic suitability index during summer maize growing season had been changed, and the climatic suitability index of northwest Anhui was much lower compared with the 1960s.
SHENG Shaoxue , ZHANG Jianjun , WANG Xiaodong . Spatial-temporal distribution of climatic suitability of summer maize in Anhui province[J]. GEOGRAPHICAL RESEARCH, 2014 , 33(8) : 1467 -1476 . DOI: 10.11821/dlyj201408007
年玉米单产;yk为第i-1年至i-5年玉米单产平均。
Fig. 1 Interannual variations of average temperature and temperature suitability index in the whole growth period of summer maize图1 夏玉米生长季平均气温(a)和温度适宜指数(b)年际变化 |
Fig. 2 Interannual variations of temperature suitability index in different growth stages of summer maize图2 夏玉米各生育期温度适宜指数年际变化 |
Fig. 3 Interannual variations of annual average precipitation, water requirement of ten days (a) and precipitation suitability index (b) in the whole growth period of summer maize图3 夏玉米多年平均逐旬降水量与需水量变化(a)、全生育期降水适宜指数年际变化(b) |
Fig. 4 Interannual variations of precipitation suitability index in different growth stages of summer maize图4 夏玉米各生育期降水适宜指数年际变化 |
Fig. 5 Interannual variations of sunshine hours (a) and sunshine suitability index (b) in the whole growth period of summer maize图5 夏玉米全生育期日照时数(a)和日照适宜指数(b)年际变化 |
Fig. 6 Interannual variations of sunshine suitability index in different growth stages of summer maize图6 夏玉米各生育期日照适宜指数年际变化 |
Fig. 7 Interannual variation of climatic suitability index in the whole growth period of summer maize图7 夏玉米全生育期气候适宜指数年际变化 |
Fig. 8 Spatial distribution of climatic suitability index in the whole growth period of summer maize in Anhui province图8 安徽省夏玉米生长季气候适宜指数空间分布特征 |
The authors have declared that no competing interests exist.
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