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背景伍帕特基国家保护区(图一)所在乡野,依任何标准看都是干旱地区。这里的植被群是沙漠草地和沙漠灌木丛(Brown 1982:115—21;Turner 1982:145—55),基底是曾经折叠和断层、已丧失原始状态的多孔砂岩和石灰岩(Strahler 1944;Sehroeder 1977:4—5)。由于风大、年蒸发率(140cm)高、湿度相当低,水份散失极快,多孔基
Background The countryside in the Wupatki National Reserve (Figure 1) is, by any measure, an arid region. The vegetation here is desert grassland and desert shrubbery (Brown 1982: 115-21; Turner 1982: 145-55). The basement is a once-folded and faultless porous sandstone and limestone that has lost its original state (Strahler 1944; Sehroeder 1977: 4-5). As the wind, the annual evaporation rate (140cm) high humidity is quite low, water loss extremely fast, porous