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所谓人造小环境即是在等高梯田带的坡壁上挖成马蹄形的土穴,土穴开口均朝南或偏南,其直径为3米,穴壁的中间部位高约1.5米(图1)。人造小环境试验设在广西南部的浦北县内东方农场的一个小山(北纬22°,东径103°33′)的南坡、东坡和西坡的中上部。小山所处的大地形属于海拔较低(约30米)的开阔丘陵地,冷空气易入侵,每年冬季寒潮频繁,平流和晴夜辐射降温都十分明显。1982年12月27—29日,1983年元月8—10日,
The so-called man-made small environment that is cut in the slope of the contour terraces with horseshoe-shaped soil holes, soil openings are south or south, with a diameter of 3 meters, hole wall in the middle of about 1.5 meters high (Figure 1). The man-made small-scale environmental test was conducted on the southern slopes, eastern slopes and mid-upper slopes of a hill (latitude 22 ° north latitude, 103 ° 33 ’east longitude) of the Oriental Farms in Pubei County in southern Guangxi. The large terrain on the hill belongs to the open hilly area with a low altitude (about 30 meters). The cold air is easy to invade. The frequency of winter cold tides is frequent, and the advection and sunny night radiation are very obvious. December 27-29, 1982, January 8-10, 1983,