Plant diversity with species drilled in the same or alternate rows enhanced pasture yield and quality over 4 years

A. Black, T. Myint, Arulmageswaran Shampasivam, Shuo Yang
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引用次数: 1

Abstract

This paper reports on the effects of plant species diversity and sowing method on pasture yield and quality. Nineteen seed mixtures of perennial ryegrass (PR), plantain (Pl), white clover (WC) and red clover (RC) were sown on 26 March 2015 at Lincoln University. Four mixtures of PR, Pl and WC were repeated with species separated in alternate drill rows. Plots were grazed by sheep and irrigated. After 4 years, a mixture with 25% of each species based on seed count – equivalent to 7.5 kg PR, 5.6 kg Pl, 1.9 kg WC and 4.4 kg RC (19.4 kg total seed)/ha – produced an optimal balance of increased total yield (17.44 t DM/ha/yr), weed suppression (0% of total yield), metabolisable energy (11.4 MJ/kg DM) and crude protein (19% of DM). Sowing method had no effect. Plant diversity enhanced pasture production through positive interactions and identity effects among the legumes (WC and RC) and non-legumes (PR and Pl). The strength of interactions between species depended on the identity and relative abundances of the species involved. The diversity effects occurred alongside shifts in species relative abundances over time. This study demonstrated an experimental basis for the evaluation of multi-species pasture mixtures.
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在4年内,同行或隔行钻孔的植物多样性提高了牧草产量和质量
本文报道了植物物种多样性和播种方式对牧草产量和品质的影响。2015年3月26日,在林肯大学播种了19种多年生黑麦草(PR)、车前草(Pl)、白三叶(WC)和红三叶草(RC)混合种子。重复使用PR、Pl和WC 4种混作,株系隔行分离。小块地被羊放牧和灌溉。4年后,根据种子数量,每个物种的混合比例为25%(相当于7.5 kg PR, 5.6 kg Pl, 1.9 kg WC和4.4 kg RC (19.4 kg总种子)/ha),在增加总产量(17.44 t DM/ha/年)、抑制杂草(总产量的0%)、代谢能(11.4 MJ/kg DM)和粗蛋白质(19% DM)方面达到最佳平衡。播种方式对其无影响。植物多样性通过豆科植物(WC和RC)和非豆科植物(PR和Pl)之间的正交互作用和认同效应促进了牧场生产。物种间相互作用的强度取决于所涉及物种的特性和相对丰度。多样性效应与物种相对丰度随时间的变化同时发生。本研究为多种牧草混交评价提供了实验依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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