Effect of Soil Erosion on Productivity of Sloping Field in a Micro-plot Experiment

土壤侵蚀对坡耕地生产力影响的微区试验(英文)

[Objective] This study aimed to explore the effects of soil erosion on the productivity of sloping field. [Method] Through removing of and covering with topsoil in a micro-plot experiment, the effect of soil erosion on productivity of sloping field was studied. [Result] The results showed that there was extremely significantly posi- tive correlation between the thicknesses of covered topsoil with either the yield of maize seeds or the yield of maize stalks, which indicated that the yields of maize seeds and maize stalks decreased extremely significantly with the increase of the amount of surface soil loss caused by erosion on the sloping field. The yields of maize seeds and maize stalks decreased by 29.62% and 24.46% respectively in the treatment with removal of a 15 cm thick layer of mature topsoil in the plow layer; the yields of maize seeds and maize stalks decreased by 17.31% and 20.14% re- spectively in the treatment with removal of a 10 cm thick layer of mature topsoil in the plow layer; the yields of maize seeds and maize stalks decreased by 12.69% and 11.51% respectively in the treatment with removal of a 5 cm thick layer of ma- ture topsoil in the plow layer; the yields of maize seeds and maize stalks increased by 10.00% and 9.35% respectively in the treatment with covering with a 5 cm thick layer of mature topsoil in the plow layer; the yields of maize seeds and maize stalks increased by 15.77% and 16.19% respectively in the treatment with covering with a 10 cm thick layer of mature topsoil in the plow layer; the yields of maize seeds and maize stalks increased by 17.69% and 25.18% respectively in the treat- ment with covering with a 15 cm thick layer of mature topsoil in the plow layer. [Conclusion] This study provides a basis for assessing the effect of soil erosion on sloping field.

[目的]研究土壤侵蚀对坡耕地生产力的影响。[方法]通过红壤旱坡地铲土覆土微区试验,研究土壤侵蚀对坡耕地生产力的影响。[结果]结果表明,覆土厚度与玉米籽粒产量、秸秆产量均呈极显著正相关,表明随着坡耕地表土冲刷损失数量的增加,玉米籽粒和秸秆产量极显著减产。铲除耕作层熟化表土15cm,玉米籽粒减产29.62%,秸秆减产24.46%;铲除耕作层熟化表土10cm,玉米籽粒减产17.31%,秸秆减产20.14%;铲除耕作层熟化表土5cm,玉米籽粒减产12.69%,秸秆减产11.51%;覆土耕作层熟化表土5cm,玉米籽粒增产10.00%,秸秆增产9.35%;覆土耕作层熟化表土10cm,玉米籽粒增产15.77%,秸秆增产16.19%;覆土耕作层熟化表土15cm,玉米籽粒增产17.69%,秸秆增产25.18%。[结论]本研究为评估坡耕地水土流失的影响提供了依据。