研究报告

  • 范晓娟,张丽萍,邓龙洲,邬燕虹,孙天宇,费凯.我国东南典型侵蚀区坡地磷素流失机制模拟研究[J].环境科学学报,2018,38(6):2409-2417

  • 我国东南典型侵蚀区坡地磷素流失机制模拟研究
  • Study on the mechanism of slope phosphorus loss in the typical erosion area in southeast China
  • 基金项目:国家自然科学基金项目(No.41471221);江西省土壤侵蚀与防治重点实验室开放基金(No.JXSB201502)
  • 作者
  • 单位
  • 范晓娟
  • 浙江大学土水资源与环境研究所, 浙江省农业资源与环境重点试验室, 浙江大学环境与资源学院, 杭州 310058
  • 张丽萍
  • 浙江大学土水资源与环境研究所, 浙江省农业资源与环境重点试验室, 浙江大学环境与资源学院, 杭州 310058
  • 邓龙洲
  • 浙江大学土水资源与环境研究所, 浙江省农业资源与环境重点试验室, 浙江大学环境与资源学院, 杭州 310058
  • 邬燕虹
  • 浙江大学土水资源与环境研究所, 浙江省农业资源与环境重点试验室, 浙江大学环境与资源学院, 杭州 310058
  • 孙天宇
  • 浙江大学土水资源与环境研究所, 浙江省农业资源与环境重点试验室, 浙江大学环境与资源学院, 杭州 310058
  • 费凯
  • 浙江大学土水资源与环境研究所, 浙江省农业资源与环境重点试验室, 浙江大学环境与资源学院, 杭州 310058
  • 摘要:为了研究侵蚀区坡地坡面径流和壤中流磷素流失特征,以浙江省湖州市安吉县花岗岩风化母质上发育的红壤为研究对象进行人工模拟降雨试验.结果表明,坡面径流和壤中流中的总磷流失浓度、总磷流失量均随着降雨强度的增大而增大,随着降雨强度的增大产流初期坡面冲刷效应显现;坡面径流总磷流失量所占每场降雨总磷流失量百分比分布在51%~92%;坡面径流总磷流失浓度在整个过程中波动幅度很大;坡面径流中总磷流失浓度在坡度25°下最高,壤中流中的总磷流失浓度在坡度8°下最高;坡度8°下坡面TP流失量最大,坡面总磷流失量受坡面径流量和雨强影响极显著(p<0.01);壤中流总磷流失量较小,受雨强影响极显著(p<0.01);磷素流失以坡面径流流失为主,壤中流流失为辅,磷素主要以颗粒态通过坡面径流流失,以溶解态通过壤中流流失.
  • Abstract:In order to determine the effects of slope and rain intensity on total phosphorus loss, the slope and subsurface runoff of typical granite erosion slope land under different rainfall intensities (90, 120 and150 mm·h-1) and slopes (8°, 15ånd 25°) were studied in the flume(2.0 m length×1.0 m width×0.6 m depth) through an indoor artificial simulated rainfall experiment. Main conclusions were as follows:1The total Phosphorus loss concentrations varied with different slope, and it showed highest at the slope of 25°. Total Phosphorus loss concentration of subsurface runoff on different slope followed the trend of 8° > 15° > 25°, and it decreased rapidly at the beginning of the subsurface runoff duration and then changed steadily. 2Total Phosphorus loss of slope runoff on 8°-slope was much higher than that on other slopes, and it was significantly influenced by rain intensity and the volume of slope runoff (p<0.01). Total Phosphorus loss of subsurface runoff was less, which was greatly influenced by rainfall intensity (p<0.01). 3The volume of slope runoff was significantly affected by rainfall intensity (p<0.05), while the volume of subsurface runoff was highly related to slope (p<0.01). 4Total Phosphorus loss of slope runoff under different rainfall intensity conditions was 150 mm·h-1 > 120 mm·h-1 > 90 mm·h-1, which was consistent with the results for total Phosphorus loss of subsurface runoff and that influenced by rainfall intensity. 5Analysis results showed that the critical slope was close to 8°-slope and the critical rainfall intensity was 120 mm·h-1 under the test conditions.6Phosphorus loss was mainly effected by slope runoff, while subsurface runoff loss was less important. Phosphorus loss through slope runoff was mainly in particulate phosphorus form, and it was mainly loss in dissolved phosphorus form through subsurface runoff.

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