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坡地修成梯田后,因种植田面由坡变平和地埂占地,使种植面积减少;地埂利用可增加一定收入,而其经营和维修又需加大管理运行费用。在坡地改梯田经济效益计算中,除考虑单位种植面积产值变化外,还要考虑坡改梯后的“坡度效应”和“地埂效应”。据此,推导出坡改梯直接经济效益的计算公式。
After the terrace is built into a terrace, the planted area will be reduced due to the flattening of the farmland from the slope to the ground, and the utilization of ground 埂 may increase certain income. However, the operation and maintenance of the farmland will increase the management and operation costs. In the calculation of the economic benefits of slope conversion to terrace, in addition to taking into account the unit area of ?? output area changes, but also to consider the slope after the “gradient effect” and “ground effect.” Based on this, the formula for calculating the direct economic benefits of slope changing is deduced.