【摘要】 利用室内模拟降雨试验,研究了秸秆覆盖对坡面土壤矿质氮素径流流失和入渗的影响。结果表明:秸秆覆盖可使侵蚀量显著减少,减沙效应十分明显。由于秸秆覆盖使坡面径流流速减弱,增加了表层土壤与地表径流的作用强度,使溶解和解吸于径流中的矿质氮素含量增加,但由径流显著减少,矿质氮流失总量仍减少。与裸地相比,秸秆覆盖可显著地增加土壤水分和硝态氮的入渗深度和入渗量。更多还原

【Abstract】 According to the result of simulated runoff experiment in laboratory, the impact of the mineral nitrogen’s transport with surface runoff and leaching are analyzed. It is validated that the straw coverage can greatly decrease soil erosion and reduce the velocity of flow on the loess slope. Therefore, the interaction between soil nitrogen and runoff is prolonged, which lead to more mineral nitrogen to be dissolved by runoff. However, the total amount of the mineral nitrogen loss by runoff is reduced. Compared with the result of bare land, the straw cover can be concluded that the infiltrative depths and amount of water and soil nitrate are added.更多还原