片麻岩坡面花生不同生长时期水土及养分流失规律

发布时间：2018-11-07 08:40

【摘要】：通过室内人工模拟降雨的方法,研究了花生不同生长时期片麻岩坡面水土流失和养分流失特征。结果表明:花生不同生长时期产流产沙量不同,总体流失量均呈现出0d20d40d60d,与对照(0d)相比,花生60d坡面产流量减少了38%,产沙量减少了47%;不同生长时期坡面养分流失量随生长天数的增加而减少,与对照(0d)相比,60d坡面氮磷钾养分流失量分别减少了75%,45%,70%,降雨过程中硝态氮流失量始终高于铵态氮流失量;不同生长时期坡面养分流失量表现为钾流失总量氮流失总量磷流失总量,养分流失总量与产沙量之间方程拟合系数均达0.98以上,有着显著的正相关性;花生不同生长时期片麻岩坡面磷钾的流失主要以泥沙结合态为主,氮素流失为溶解态氮与泥沙态氮共存。
[Abstract]:The characteristics of soil and water loss and nutrient loss at different growth stages of peanut gneiss slope were studied by artificial rainfall simulation in laboratory. The results showed that the yield of abortion and sediment was different in different growing periods, and the total loss was 0 d 20 d 40 d 60 d. Compared with the control (0 d), the yield and discharge of peanut 60 d slope surface decreased 38% and the sediment yield decreased 47%. The loss of nitrogen, phosphorus and potassium decreased with the increase of growth days in different growth periods. Compared with the control (0 d), the loss of nitrogen, phosphorus and potassium in 60 days decreased 75% 4570%, respectively. The amount of nitrate nitrogen loss was always higher than that of ammonium nitrogen loss during rainfall. The nutrient loss of slope at different growth stages was potassium loss, total nitrogen loss, total phosphorus loss, and the fitting coefficient of the equation between nutrient loss and sediment yield was more than 0.98, which had significant positive correlation. The loss of phosphorus and potassium at different growth stages of peanut gneiss slope is mainly composed of sediment bound form and nitrogen loss is the coexistence of dissolved nitrogen and silt nitrogen.
【作者单位】：河北农业大学资源与环境科学学院;河北省山区研究所;国家北方山区农业工程技术研究中心;河北省山区农业工程技术研究中心;
【基金】：河北省自然科学基金项目“人工模拟降雨条件下的片麻岩山坡地土壤氮素流失研究”(C2015204155)
【分类号】：S157.1

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