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The frost-free period (FFP), first frost date (FFD) and last frost date (LFD) have been regard as the important climate variables for agricultural production. Understanding the spatio-temporal variations of the FFP, FFD and LFD is beneficial to reduce the harmful impacts of climate change on agricultural production and enhance the agricultural adaptation. This study examined daily minimum temperatures...
The relief amplitude is an important indicator in digital geomorphologic mapping, the evaluation of soil erosion sensitivity. Based on the DEM data (100m resolution), the relief amplitude of Qinghai was calculated by spatial statistical tool of GIS. By using the method of window analysis and the mean of change-point, the optimum statistical unitand relief amplitude of Qinghai Province was calculated...
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