Light competition is the key factor determining spatio-temporal variability in legume proportion within Marandu palisadegrass–forage peanut mixed pastures

IF 1.8 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY
Paola P. Spasiani, B. Homem, I. G. Lima, B. C. Guimarães, E. Medeiros, J. Muir, M. S. Oliveira, R. Boddey, D. R. Casagrande
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Abstract

ABSTRACT Context. Understanding ecology in grass–legume pastures can help support strategies aimed at maintaining canopy stability in terms of botanical composition. Aims. This 2-year study evaluated spatial variability, focusing on plant structural characteristics in a Marandu palisadegrass [Urochloa brizantha (Hochst. Ex A. Rich.) R.D. Webster cv. Marandu]–forage peanut (Arachis pintoi Krapov. and W.C. Greg. cv. BRS Mandobi) mixed canopy under grazing in continuous stocking management. Methods. The pasture was managed with canopy height of 20–25 cm. The experimental area had a permanent sample grid containing 50 pre-established and georeferenced plots. Principal component analysis was performed, and spatial dependence structure of the first principal component and structural variables were separately characterised by geostatistical analysis. Key results. There was spatial dependence of the structural characteristics, with marked spatial heterogeneity in the distribution of all variables. Taller grass canopies caused competition for light between species, reducing legume contribution and inducing more erect forage peanut growth habit. Conversely, in areas with lower grass canopy height, forage peanut botanical composition increased to up to 70%, as it propagated more effectively by stoloniferous propagation. Conclusions. The canopy structure spatial variability of a Marandu palisadegrass–forage peanut mixed pasture determines the overall average pasture grass/legume proportion. In regions with taller canopies, Marandu palisadegrass was favoured, while in areas with shorter canopy, forage peanut proportion was promoted. Satisfactory legume proportions can be reached in the canopy despite areas with reduced legume contribution. Implications. Our findings using geostatistical techniques facilitate the development of useful and innovative tools allowing better comprehension for the management of mixed pastures.
光竞争是决定马兰杜栅栏-饲草-花生混合牧场内豆类比例时空变异的关键因素
抽象的上下文。了解禾本科豆科牧草的生态学可以帮助支持在植物组成方面维持冠层稳定性的策略。目标这项为期2年的研究评估了空间变异性,重点研究了马兰度草(Urochloa brizantha, Hochst.)的植物结构特征。例A.里奇。)韦伯斯特简历。[马兰杜]-饲料花生(花生)和W.C.格雷格。简历。放牧条件下混合林冠的连续放养管理。方法。草地的冠层高度为20 ~ 25 cm。实验区有一个永久的样本网格,包含50个预先建立的和地理参考的地块。进行主成分分析,通过地统计分析分别表征第一主成分和结构变量的空间依赖结构。关键的结果。结构特征具有空间依赖性,各变量分布具有明显的空间异质性。较高的草冠层引起了种间的光竞争,减少了豆科植物的贡献,诱导了更直立的饲用花生生长习性。相反,在草冠层高度较低的地区,饲草花生的植物组成增加了70%,这是因为它通过匍匐茎繁殖更有效。结论。马兰度栅栏-草食-花生混合草场的冠层结构空间变异性决定了牧草/豆科植物的总体平均比例。在冠层较高的地区,有利于种植马兰度围栏草,在冠层较短的地区,有利于提高饲用花生比例。尽管豆科植物贡献减少,但在冠层中仍能达到满意的豆科植物比例。的影响。我们使用地质统计学技术的研究结果促进了有用和创新工具的发展,从而更好地理解混合牧场的管理。
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来源期刊
Crop & Pasture Science
Crop & Pasture Science AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
4.20
自引率
15.80%
发文量
111
审稿时长
3 months
期刊介绍: Crop and Pasture Science (formerly known as Australian Journal of Agricultural Research) is an international journal publishing outcomes of strategic research in crop and pasture sciences and the sustainability of farming systems. The primary focus is broad-scale cereals, grain legumes, oilseeds and pastures. Articles are encouraged that advance understanding in plant-based agricultural systems through the use of well-defined and original aims designed to test a hypothesis, innovative and rigorous experimental design, and strong interpretation. The journal embraces experimental approaches from molecular level to whole systems, and the research must present novel findings and progress the science of agriculture. Crop and Pasture Science is read by agricultural scientists and plant biologists, industry, administrators, policy-makers, and others with an interest in the challenges and opportunities facing world agricultural production. Crop and Pasture Science is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
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