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

被引：2

作者：

Spasiani, Paola Palauro ^{[1
]}

Homem, Bruno Grossi Costa ^{[1
]}

de Lima, Italo Braz Goncalves ^{[1
]}

Guimaraes, Bianca Costa ^{[1
]}

de Medeiros, Elias Silva ^{[2
]}

Muir, James Pierre ^{[3
]}

de Oliveira, Marcelo Silva ^{[4
]}

Boddey, Robert Michael ^{[5
]}

Casagrande, Daniel Rume ^{[1
,6
]}

机构：

[1] Univ Fed Lavras, Dept Anim Sci, UFLA, BR-37200900 Lavras, MG, Brazil

[2] Fundacao Univ Fed Grande Dourados, Fac Ciencias Exatas & Tecnol, BR-79804970 Dourados, MS, Brazil

[3] Texas A&M Univ, Texas A&M AgriLife Res, Stephenville, TX 76401 USA

[4] Univ Fed Lavras, Dept Stat, UFLA, BR-37200900 Lavras, MG, Brazil

[5] Embrapa Agrobiol, BR-23891000 Seropedica, RJ, Brazil

[6] Univ Fed Lavras, Dept Anim Sci, Campus Univ,Caixa Postal 3037, BR-37200900 Lavras, MG, Brazil

来源：

CROP & PASTURE SCIENCE | 2023年 / 74卷 / 09期

关键词：

Arachis pintoi; clonal propagation; geostatistics; mixed pasture; spatial variability; stoloniferous; Urochloa brizantha; warm-season legume; WARM-SEASON; CATTLE DUNG; GRASS; SOIL; PRODUCTIVITY; GROWTH; PERSISTENCE; DEFOLIATION; MANAGEMENT; PATTERNS;

D O I：

10.1071/CP22134

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

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.

引用

页码：898 / 910

页数：13