关键词: 推算方法, 农业气候资源, 山区地形, 福建省沙溪流域

Abstract: In this paper, the methods calculating the spatial distribution of agroclimatic resources (temperature, humidity, precipitation, wind speed, etc.) in mountainous areas are presented. For suiting to the application of computer in the research of mountain climate, the calculating models are represented by functional relations and the spatial distribution maps of agro-climatic resources on fine mesh are drawed up by computer. The climatic effects of topography obtained from the application of these methods in the Shaxi River basin, in the midwest of Fujian Province, are also introduced. The effects of microtopography on thermal resources can be divided into four types: the temperature-increasing, -decreasing, -variable and -invariable, in which the greatest increasing and decreasing effects correspond to the effects of decrease and increase by 100-250 m in elevation respectively. The effect of meso- and microtopography on precipitation is affected by the topography and the prevailing wind direction with precipitation. And the effect of microtopography on wind speed is related to the topography and the angle between the wind direction and the topography. The spatial distribution maps of accumulated temperature above 10℃ (∑t10) and annual precipitation (P) in the Shaxi River basin show that the methods of calculation proposed in this paper may effectively disclose the macro and micro variations of spatial distribution of agroclimatic resources in mountainous areas, and their effects are very satisfactory.

Key words: method of calculation, agroclimatic resources, mountainous area topography, Shaxi River basin in Fujian Province