不同植被缓冲带对坡耕地地表径流中氮磷的拦截效果--《农业环境科学学报》2010年09期

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k_-I y%?Z-Q&}0不同植被缓冲带对坡耕地地表径流中氮磷的拦截效果

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S)Hn P TIG9A H0王华玲 赵建伟 程东升 刘玲花 戢正华 贺茂银 朱端卫水利论文K"[mn9Y

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【摘要】:植被缓冲带是一种控制非点源污染的新型生态工程措施,采用坡地小区试验方法,在构建等高植物篱的坡耕地低处进行了不同植被缓冲带对径流污染物的拦截试验,其处理分别为:(a)普通施肥结合紫穗槐和三叶草;(b)平衡施肥结合紫穗槐和三叶草;(c)普通施肥结合三叶草;(d)平衡施肥结合紫穗槐。结果表明,夏玉米生长期,植被缓冲带对径流量及侵蚀量的拦截作用显著,a、b、c和d处理缓冲带相对于植物篱处理,其径流量分别减少98.0%、97.5%、97.2%和97.5%,侵蚀量分别减少98.8%、98.7%、97.9%和98.0%;植被缓冲带对N、P的拦截效果不同,a、b、c和d处理缓冲带相对于植物篱处理,对NH4+-N的平均拦截率分别为48.2%、86.2%、90.6%和95.1%,对TP的平均拦截率分别为49.2%、42.4%、41.3%和36.4%。试验结果对山区坡耕地面源污染的控制,重点水源地的水质保护提供了借鉴。水利论文C9sfH T#}

u1CzO$k0【作者单位】:水利论文JP#XC!VG F;g(i

+u.L"S"fG0华中农业大学农业部亚热带农业资源与环境重点开放实验室;中国水利水电科学研究院水环境研究所;湖北省十堰市农业生态环境保护站;水利论文oaH*T(X!C

g+\5v#gQ} W0【关键词】:水利论文 xw1p0lg3x2S

F"k/^I:s}J'r4r"n0植被缓冲带 坡耕地 地表径流 拦截率 氮 磷

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Mt3Kd9S%c0【基金】:国家科技支撑计划(2006BAD01B08-01)

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【分类号】:S157

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【正文快照】:水利论文!S"f0?.X-VI

2GfO P,_8J)@0降雨后产生的地表径流是土壤养分流失的动力。养分的流失,导致部分营养物质的富集和面源污染的产生,因而从控制养分流失途径入手,最大限度地拦截地表径流中的污染物对控制面源污染有重要意义。作为最佳管理措施之一,植被缓冲带在面源污染控制上在国外已得到广泛应用。植被缓

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