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草业学报  2015 

生草栽培对果园面源污染的控制:三种牧草的比较研究

DOI: 10.11686/cyxb20150206, PP. 49-54

Keywords: 果园生草,面源污染,地表径流,草地

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Abstract:

本文选择菊苣、紫花苜蓿和白三叶,在桃园分别建立3种生草栽培模式,并以清耕为对照。通过人工模拟暴雨的降雨过程,研究不同施肥条件下,3种生草栽培模式对地表径流和果园面源污染的影响,结果表明,桃园种植菊苣、紫花苜蓿和白三叶明显减少了地表径流,与对照相比,径流量依次降低41.6%,35.0%和58.4%,但三者之间差异不显著。地表径流量与草地盖度呈现显著负相关(P<0.05),与草地密度和基盖度的相关性不显著。不同施氮条件下,菊苣、紫花苜蓿和白三叶草地的铵态氮、总氮和总磷径流量明显下降,其中,白三叶草地对降低铵态氮、总氮和总磷的径流流失量效果最好,其次是菊苣草地。本研究结果表明不同生草栽培模式对果园面源污染的防控效果存在差异,研究结果为果园建立适宜的生草栽培模式提供了依据。

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