Seasonal dynamics of magnesium in rangeland areas of Southeastern region of Rio Grande do Sul State/Brazil: 1. field research

A. C. Fluck, Michelle de Almeida Ollé, H. Alfaya, J. Reis, João P. da Silva
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Abstract

We aimed to evaluate the seasonal dynamics of magnesium (Mg) in the system soil - plant - animal. It was conducted in two natural rangeland areas on two types of undisturbed soils (medium-clayey texture) in the Serra do Sudeste region (Rio Grande do Sul State, Brazil). In each area, 12 heifers were kept under continuous extensive grazing for twelve months without mineral supplementation. Samples of soil and vegetation were collected monthly from 16 fixed points and blood serum from each of the animals in each area monthly for the determination of Mg levels. The data were analyzed by analysis of variance, decomposition of the annual variation of the response variables and regression (harmonic analysis) for adjustment of function to express this variation. The Mg content in the soils of the two areas was high (1.86 ± 0.045 cmolc.dm-3). Mg levels in the vegetation (0.23 ± 0.0025 % DM) are sufficient to meet the needs of all categories of ruminants. The Mg contents in the blood serum (3.05 ± 0.0025) of grazing animals are considered medium to high and in normal levels. Mg supplementation is suggested in the cold season months for the most demanding animal categories (gestating and lactating females).
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巴西巴西南大德州东南部牧区镁元素的季节动态实地研究
研究了土壤-植物-动物系统中镁元素的季节性动态。该研究在巴西苏德斯特山脉(Serra do Sudeste)地区的两种未受干扰的土壤(中粘土质地)上的两个天然牧场进行。在每个地区,12头小母牛连续放牧12个月,不补充矿物质。每月在16个定点采集土壤和植被样本,每月在每个地区采集每只动物的血清,测定Mg水平。对数据进行方差分析,分解响应变量的年变化,回归(调和分析)调整函数来表达这种变化。两区土壤Mg含量均较高(1.86±0.045 cmol .dm-3)。植被中Mg含量(0.23±0.0025% DM)足以满足各类反刍动物的需要。放牧动物血清Mg含量(3.05±0.0025)属于中、高、正常水平。对于要求最高的动物类别(妊娠期和哺乳期雌性),建议在寒冷季节补充镁。
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