文章摘要
扈晓碟, 张含玉, 刘前进, 徐相忠, 邱德勋, 马良.模拟降雨条件下垄沟坡度对溶解态氮磷流失的影响[J].水土保持学报,2019,33(6):41~46
模拟降雨条件下垄沟坡度对溶解态氮磷流失的影响
Impact of Furrow Slopes on Losses of Dissolved Nitrogen and Phosphorus Under Simulated Rainfall
投稿时间:2019-05-23  
DOI:10.13870/j.cnki.stbcxb.2019.06.006
中文关键词: 横坡垄作  垄沟坡度  模拟降雨  氮磷流失  富营养化风险
英文关键词: contour ridge system  furrow slopes  simulated rainfall  loss of nitrogen and phosphorus  eutrophication risk
基金项目:国家自然科学基金项目(41701311,41571261);山东省自然科学基金项目(ZR2017JL019,ZR2017PD003);山东水土保持学会重点领域创新项目(2018003);山东省重点研发计划项目(2018GSF117001)
作者单位E-mail
扈晓碟1, 张含玉1, 刘前进1, 徐相忠1, 邱德勋1, 马良2 1. 山东省水土保持与环境保育重点实验室, 临沂大学资源环境学院, 山东 临沂 276005

2. 山东省水利科学研究院
, 山东水土保持学会, 济南 250013 
zhanghanyu@lyu.edu.cn 
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中文摘要:
      为揭示不同垄沟坡度对径流中溶解态氮、磷流失的影响,采用人工模拟降雨试验,设置4个垄沟坡度处理(0°,9°,18°和27°),研究了不同垄沟坡度对径流中速效磷(PO43--P)、硝态氮(NO3--N)和铵态氮(NH4+-N)浓度和流失量的影响;并利用Inorganic-N/PO43--P、NO3--N/PO43--P和NH4+-N/PO43--P 3种氮磷比,评价不同处理的富营养化风险。结果表明:(1)在降雨过程中,4个垄沟坡度处理径流中PO43--P、NO3--N和NH4+-N浓度随时间均呈锯齿状变化;其流失量随时间变化均呈先增加后以锯齿状变化的趋势,且波动幅度大,最大值(16.60,1 020.73,48.35 mg)分别出现在垄沟坡度为0°,0°和9°处理。(2)4个垄沟坡度处理间相比较,径流中PO43--P和NH4+-N流失量均表现为0° > 9° > 27° > 18°,其浓度最大值(0.50,1.08 mg/L)和最小值(0.37,0.76 mg/L)均分别出现在垄沟坡度为9°和18°处理;而径流中NO3--N浓度和流失量均在垄沟坡度0°处理时为最大值(30.68 mg/L和64.16 mg/m2),18°处理时为最小值(21.78 mg/L和42.22 mg/m2)。(3)Inorganic-N/PO43--P率和NH4+-N/PO43--P率表明4个垄沟坡度处理径流中均存在一定的富营养化风险。其中,垄沟坡度为0°处理的径流富营养化风险水平最高,27°处理的径流富营养化风险水平最低。研究结果可为横坡垄作的水土流失及养分流失评价、预测以及防治提供科学依据。
英文摘要:
      This study explored the effects of four furrow slopes (0°, 9°, 18° and 27°) on the concentrations and losses of PO43--P, NO3--N and NH4+-N through simulated rainfall experiments, and evaluated eutrophication risk of the runoff by the ratios of Inorganic-N/PO43--P, NH4+-N/PO43--P, and NH4+-N/PO43--P. The results were as follow:(1) PO43--P, NO3--N, and NH4+-N concentrations changed in the shape of wavy serrated shape with rainfall time under four furrow slopes. As for losses, their maximum value (16.60, 1 020.73, 48.35 mg) appeared in 0°, 0°, and 9° when they increased firstly and then changed in zigzag shape with rainfall time. (2) Under different furrow slopes, PO43--P and NH4+-N losses in runoff water were in order of 0° > 9° > 27° > 18°, whose concentration maximum value (0.50, 1.08 mg/L) and minimum value (0.37, 0.76 mg/L) appeared in 9° and 18°. NH4+-N concentration and losses maximum value (30.68 mg/L and 64.16 mg/m2) and minimum value (21.78 mg/L and 42.22 mg/m2) appeared in 0° and 18° in runoff water. (3) The ratios of Inorganic-N/PO43--P and NH4+-N/PO43--P showed that four furrow slopes output runoff all had eutrophication risk, and the 0° output runoff of that was the highest and the 27° was the lowest. These findings would provide scientific guidance for evaluation, prediction, and control of soil and water loss and nutrient loss in contour ridge system.
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