在印度梅加拉亚邦卡西丘陵地带,R.N.Rai等由溪谷向小丘延伸的土地,不同区域的地下水位深度的变化与自然溪流,排水途径和海拔密切相关。溪谷部分的地下水位较浅,而丘陵部分的则较深。在获得1500毫米以上年降雨量的卡西丘陵地带,低海拔地区也许经自然溪流水的重力作用所致改道而获得的自流灌溉。水稻是上述地区的主要作物。从事本研究的目的旨在探寻适 In the Cassie Hills of Meghalaya, India, R.N.Rai and others, extending from valleys to hillocks, the variation of groundwater table depth in different regions is closely related to natural streams, drainage channels and elevations. The valleys have a shallow groundwater level, while the hilly sections are deeper. In the Casxi hills, where annual rainfall of more than 1500 mm is obtained, runoff irrigation may be obtained at low altitude through diversions due to the gravity of natural stream water. Rice is the main crop in these areas. The purpose of this study is to explore fitness