几种水蚀阻断措施对坡地红壤干旱的影响

Effects of Water Erosion Control Practices on the Drought in Red Soil Sloping Fields

通过田间试验,研究了带状牧草、稻草覆盖和聚丙烯酰胺(PAM)表施及其组合措施对坡地红壤0-45cm土层干旱的影响。结果表明,各种水蚀阻断措施都能明显提高坡地红壤表层的土体贮水量;措施之间保水效果的差异在多雨阶段较小,而干旱阶段较大,且随土层深度增加而变大;水蚀阻断措施能够降低土体干旱发展速度,减轻土壤干旱,从而减轻作物干旱,增加其产量;PAM表施和稻草覆盖的保水抗旱效果要明显好于带状牧草。PAM表施、稻草覆盖分别与带状牧草组合以后,保水效果都有所减弱。

A field study was conducted to explore the effects of herbage strip cropping,straw mulch,polyacrylamide （PAM） applying in soil surface,and their combinations on the soil drought at 0-45 cm depth in red soil sloping fields.All these practices increased soil water storage significantly.Their effects on soil moisture retention and the difference among the practices were smaller in rainy period than in dry period,and increased as the depth of soil increased.These practices also slowed the soil drying and decreased soil drought degree,consequently,decreased the drought in peanut plant and increased the yields.PAM applying in soil surface and straw mulch showed greater effects on soil moisture retention and drought reduction than herbage strip cropping.When the practice of PAM applying in soil surface or straw mulch combined with the practice of herbage strip cropping,the effects on soil moisture retention decreased.