京郊强降雨条件下不同水土保持治理措施配置模式效益评价
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杨润泽(1996-), 男, 硕士研究生, 主要从事土壤侵蚀研究。E-mail: yangrunze0606@163.com

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S157.2

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国家林业局林业软科学研究项目(2020131016)


Evaluating the Benefits of Different Soil and Water Conservation Measures Under Heavy Rainfall Conditions in the Suburban Areas of Beijing
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    摘要:

    以石匣小流域水土保持科技示范园10个不同水土保持措施配置模式的径流小区为研究对象, 分析当地2004—2019年降雨格局变化, 并以发生在2010—2018年的19次代表性强降雨作为样本降雨事件, 探究不同配置模式对土壤侵蚀与面源污染特征的影响。结果表明: (1)2004-2019年降雨量变化范围在331.4~598.9 mm, 平均年降雨量484 mm, 小雨、中雨的发生频率降低, 大雨的发生频率增加。(2)水土保持措施在减流减沙、减少养分流失方面效果明显。在减轻地表径流方面, 表现最好的配置模式为鱼鳞坑苜蓿地与玉米梯田, 其减流率分别为88.59%, 88.40%;在减少泥沙方面, 最好的配置模式为玉米梯田, 减沙率高达97.82%;在降低面源污染方面, 表现最好的配置模式为玉米梯田, 其对TN、TP、COD的减少率分别为79.57%, 75.90%, 91.31%。(3)在强降雨条件下, 降雨量与产流产沙量、TN、TP、COD均呈正相关关系, 且降雨量与径流量、径流系数相关性较强, 相关系数分别为0.608, 0.553。I30I60与产流产沙量、COD的相关性较强。另外, 降雨历时、I60与TN、TP、COD相关性也较强。研究成果为揭示京郊地区强降雨条件下坡面土壤侵蚀机理提供了参考依据, 同时为当地开展强降雨下的水土保持工作提供科学依据。

    Abstract:

    Ten runoff plots with different configuration patterns of soil and water conservation measures in Shixia watershed Soil and Water Conservation Technology Demonstration Park were used as the study objects, and the changes in local rainfall patterns from 2004-2019 were firstly analyzed. In addition, 19 representative heavy rainfall events occurring in 2010-2018 were used as sample rainfall events to explore the effects of different configuration patterns on soil erosion and non-point source pollution characteristics. The results showed that: (1) Rainfall variation from 2004-2019 ranged 331.4~598.9 mm, with an average annual rainfall of 484 mm, a decrease in the frequency of light and moderate rainfall, and an increase in the frequency of heavy rainfall. (2) Soil and water conservation measures were effective in reducing flow and sediment and nutrient loss. In terms of reducing surface runoff, the best configuration models were fish scale pit clover fields and maize terraces, with flow reduction rates of 88.59% and 88.40% respectively; in terms of reducing sediment, the best configuration model was maize terraces, with a sediment reduction rate of 97.82%; in terms of reducing non-point source pollution, the best-performing configuration model was maize terraces, whose reduction rates for TN, TP and COD were 79.57%, 75.90% and 91.31% respectively. (3) Under heavy rainfall conditions, rainfall was positively correlated with flow production and sediment production, TN, TP and COD, and the correlation between rainfall and runoff volume and runoff coefficient were higher, with correlation coefficients of 0.608 and 0.553 respectively. I30 and I60 were more highly correlated with flow production and sediment production and COD. In addition, the correlations of rainfall ephemeris and I60 with TN, TP and COD were also high. The results of the study provide a reference basis for revealing the soil erosion mechanism of slopes under heavy rainfall conditions in suburban areas of Beijing, and at the same time provide a scientific basis for local work on soil and water conservation under heavy rainfall.

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杨润泽, 冯天骄, 肖辉杰, 王奋忠, 赵泽坤, 王世雷, 朱俊英.京郊强降雨条件下不同水土保持治理措施配置模式效益评价[J].水土保持学报,2022,36(1):8~17

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  • 收稿日期:2021-07-11
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  • 在线发布日期: 2022-01-25
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