[Changes of China agricultural climate resources under the background of climate change. V. Change characteristics of agricultural climate resources in Ningxia].

Based on the 1961-2009 weather data from 21 meteorological stations in Ningxia, this paper analyzed the spatiotemporal variation trend of regional agricultural climate resources in Ningxia, Northwest China. In 1961-2009, the air temperature in Ningxia increased gradually from south to north, with the mean annual temperature increased by 0.4 degrees C x (10 a)(-1) , while the annual precipitation in most regions decreased gradually, with a decrement 4.26 mm x (10 a)(-1). Both the frost-free period and the duration of crop growth season prolonged. The regions with > or = 10 degrees C accumulated temperature being > or = 3200 degrees C x d extended southwardly, and thereby, the regions adaptive for planting mid and late rice increased. In 2001-2009, most regions were adaptive for plating winter wheat, and the whole Ningxia was adaptive for plating spring wheat. In the southern mountain regions, the region with mean temperature in July being < or = 20 degrees C decreased gradually, and accordingly, the regions adaptive for planting potato decreased.