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坡地修梯田,是黄土高原地区保持水土的一项重要措施,也是这一地区建设基本农田的主要内容。随着梯田建设实践、认识的加深和机械化修筑梯田的开展,不少地方适当加大了梯田宽度(陡坡地区一般田宽10米左右或10几米,缓坡地区一般田宽20～30米),以适应机械耕作、灌溉和抗旱保墒的要求。梯田宽度加大,势必形成梯田埂坎的增高,陡坡地区机械修筑的梯田埂高一般为4～5米,有的高达6～7米,如修筑成传统的陡坎硬埂梯田,这就造成培埂困难和容易滑塌等问题。因此,近年来不少地区采用切土部分为陡坎硬埂,填土部分地埂为虚土堆筑的形式,形成下陡上缓的复式埂坎,这种梯田形式即是所谓的复式埂梯田,或简称复式梯田。
Slope cultivation of terraced fields, the Loess Plateau to maintain water and soil is an important measure, but also the construction of basic farmland in this area. With the practice of terraced fields and the deepening of understanding and development of mechanized terraced fields, the width of terraced fields has been appropriately increased in many places (generally 10 meters or 10 meters in steep slopes and 20-30 meters in general in gentle slope areas) Adapt to mechanical farming, irrigation and drought and soil moisture requirements. Increasing the width of terraces will inevitably lead to the increase of terraced ridge. The height of terraced rice fields built on steep slopes will generally be 4 to 5 meters, and some may reach 6 to 7 meters. As a result, traditional terraced hard-top terraces are built, resulting in Training difficulties and easy to slip and other issues. Therefore, in recent years, many areas have adopted the cut-off part of the steep-ridge hard 埂, fill part 地 of the form of the accumulation of the soil, forming a complex steep slope of the lower ridge, this terraced form is the so-called duplex 埂Terraced fields, or simply duplex terraces.