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Regional differences in the soil and water conservation efficiency of conservation tillage in China
- Jia, Lizhi, Zhao, Wenwu, Zhai, Ruijie, Liu, Yue, Kang, Meimei, Zhang, Xiao
- Catena 2019 v.175 pp. 18-26
- engineering, environmental factors, erosion control, karsts, mountains, mulches, no-tillage, runoff, sediments, soil, water conservation, water erosion, China
- The benefits of conservation tillage on water erosion control have been extensively tested in China, while few studies have involved their regional differences. We synthesized 81 recent publications about the water erosion control by conservation tillage in China, to explore the regional difference of conservation tillage and identify the optimal tillage methods of each region. The benefits of conservation tillage for runoff retention and sediment reduction are different in different regions due to the special environmental condition of each region. Conservation tillage demonstrated the lowest efficiency in the Northwest China Loess Plateau region and highest in the North China mountainous region, while no significant differences were found among other 4 regions. In the Northeast China black soil region, micro-basins tillage (MBT) is the optimal tillage method due to its greatest benefits in reducing runoff and sediment. In the North China mountainous region, the values of regional efficiency evaluation index (REEI) of runoff and sediment were both larger than 1 only by contour tillage with hedgerow (CTH), thus CTH will be the optimal tillage method in this region. In the Northwest China Loess Plateau region, some engineering measures should be the priority due to the limited benefits of conservation tillage. In the South China red soil region, no tillage with mulch (NTM) presented the greatest benefits on water erosion control and largest values of runoff and sediment REEI, thus CTH is the priority in this region. In the Southwest China purple soil region, though the values of runoff and sediment REEI by collecting soil to form ridges with no tillage (CSNT) are less than those by MBT, CSNT is the most suitable tillage method in this region. The small sample size leads to the unreliable results in the Southwest China karst region, thus more researches are needed in this region.