Study On Spatial And Temporal Variation Of Ariculture Meteorology Arid In Yellow River Basin

The Yellow River Basin (YRB) plays a very important role on Chinese agriculture and the national economic development. However, the situation of water scarcity has seriously restricted agricultural sustainable development in YRB. Therefore, it is importantly stratagems to ravel variety of the agricultural drought climate,and mark out reasonable development modes to the food security, ecological security and resource security of the Yellow River Basin.In this document, YRB is selected as the study area. The methods of GIS, Surfer ect.are used to analysis Spatial-temporal Pattern of Arid index, the water surplus and deficiencys(WSD) and the reference crop evapotranspirations(ET₀) based on 93 meteorological stations's climatic data of daily temperature, relative moisture, actual sunlight, longitude&latitude and height above sea level etc. authorized by the National Climatic Bureau between 1957 and 2001 (covering 45 a), according to the latest using Penman - Monteith method recommended by the FAO in 1998 to illuminate the agricultural climate resource in YRB.Based on Arid index, classification of YRB can be zoned into 4 areas. At the same time, agricultural development modes for each are discussed in this paper. In conclusion, some important results are obtained as follows:â‘ the spatial distribution of Arid index is strongly affected by climatic and geographical factors, and Arid index decreases from the north to south. From 1957 to end of 1990s,the trend of Arid index is stable and then increase. At same time, the seasonal different variation of Arid index is obvious, which is winter >spring>autumn> summer. The maximum value of Arid index occurs in July,August and September in the upper, middle and lower of this basin respectively, and the minimum value is from November and to next March with a distinct regional variation.â‘¡the spatial distribution of ET₀ is mainly affected by the natural climatic and geographical factors which have a very obvious geographical influence with a major trend of transpiration decreasing from the east and north to the west and south, from the plain area to the high plateau. As far as the annual variation, the potential transpiration generally displays a decreasing trend from 1957 and then increasing trend up to 1990s, the seasonal trend is summer>spring>autumn>winter, as to the monthly variation, ET₀ in the upper,middle and lower of YRB is highest between May and July, and lowest between November and February with a distinct regional variation. The results provide a reference to alleviate the shortage of water resources in the Yellow River Valley, estimate the water requirement and for crop.The spatial distribution of WSD is strongly affected by climatic and geographical factors, and WSD decrease from the north to south in YRB, and from the northwest to the southeast in the northland of YRB. From 1957 to end of 1990s,WSD increases. At same time, the seasonal variation of WSD is obvious, which is spring>summer>winter>autumn. The maximum value of WSD occurs in April, May and June in the upper, middle and lower of this basin respectively, and the minimum value is July, August and September with a distinct regional variation.â‘¢Based on Arid index, classification of Yellow River Basin can be zoned into 4 areas, which are dry area, dry semi-arid, semi-humid, semi-humid and humid area. Based on the natural conditions and agricultural production status of the 4 areas, the 19 kind areas are farther plotted out. At the same time, agricultural development modes for each are discussed in this paper in order to improve the high-efficient utilization of water resources. Therefore, it is significant to improve the actuality of drought and realize sustainable development of the modern agriculture and modern drought water-saving agriculture in the YRB.