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为什么梯田能防止水土流失？
梯田能防止水土流失主要是因为梯田可以减缓坡度、拦截雨水、以及增加植被覆盖。
1、梯田可以减缓坡度。梯田通过将山坡分割成多个台阶式水平面，降低了坡面的坡度，减缓了地表径流的流速，从而有效地减少了水土流失。
2、梯田可以拦截雨水。梯田的田埂可以拦截和储存雨水，减少雨水对土壤的直接冲刷，同时增加土壤的入渗量，使得雨水能够更多地被土壤吸收，减少地表径流。
3、梯田可以增加植被覆盖。梯田的田埂和田面通常种植有作物或植被，这些植被的根系可以固土保水，减少土壤裸露，从而进一步防止水土流失。
总结：梯田能防止水土流失，是因为梯田可以减缓坡度、拦截雨水以及增加植被覆盖。
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