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草业学报  2015 

连续两年施氮对15龄混作禾草草地的改良效果研究

DOI: 10.11686/cyxb2015007, PP. 130-137

Keywords: 人工草地,多年生禾草,混作,施氮,改良

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Abstract:

以1999年建植的5个不同禾草组合混作草地为对象,研究连续两年不同施氮量75kg/hm2(N1),150kg/hm2(N2),225kg/hm2(N3)和0kg/hm2(CK)对草地生产力的提升及群落特征的综合影响。结果表明,连续2年施氮均可不同程度提升高寒地区人工禾草草地的生产力和草层高度,但一定程度降低了草地群落的物种多样性和丰富度。N2梯度可在有效提高草地生产力的同时,更好维持建植禾草的优势地位和物种的多样性水平,是该地区15龄人工草地改良的最佳施氮量。不同的禾草混作组合样地及不同施氮年份对施氮的响应存在一定差异,垂穗披碱草比重较大的样地对氮肥的响应较其他禾草更为敏感。研究也证明,过量施氮或单纯连续施氮对高寒地区多年生禾草混作草地群落的稳定性会造成一定影响。

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