The Response of Agricultural Water Demand to Climate Change in Shiyang River Basin, in Northwest China
This paper reports on the method of linking climate change scenarios with hydrologic and agricultural theory to study agriculture water demand under changing climate conditions, which is applied in Shiyang River basin, in Northwest China. We calculate agriculture water demand by use of Penman-Monteith formula and field water balance theory, droved by climate factors. This paper concludes that, the response of agriculture water demand to climate change exists, but the climate change can’t vary the basic law of water resources system; reference evapotranspiration (ET0) and temperature represent positive correlation, moreover, agriculture water demand and temperature also exist positive correlation, however, agriculture water demand and precipitation show the evident negative correlation; the influence of agriculture water demand which induced by temperature increase or decrease 1°C is larger than that induced by precipitation increasing or decreasing 10%; the influence range of agriculture water demand which induced by precipitation decrease is larger than that induced by precipitation increase; the influence range of agriculture water demand which induced in the guarantee rate of 75% is larger than that which induced in the guarantee rate of 50%; in additionally, the influence range of agriculture water demand in 2020 is larger than that in 2010. Therefore, in these relatively water shortage areas, changes in agriculture water demand due to climate change will require timely improvement in crop cultivars, irrigation and drainage technology, and water management.
Weiguo Pan, Jianxing Ren and Yongguang Li
H. Q. Wang et al., "The Response of Agricultural Water Demand to Climate Change in Shiyang River Basin, in Northwest China", Advanced Materials Research, Vols. 347-353, pp. 1964-1972, 2012