It is well reported in the scientific literature that pastures can have similar net forage accumulation when managed with contrasting structures. However, we hypothesized that the dynamics of forage accumulation in grazed swards is linked to seasonal‐environmental conditions. Marandu palisadegrass (Brachiaria brizantha [Hochst. ex A. Rich.] was used as the forage species model. The experimental treatments were four grazing heights (10, 20, 30 and 40 cm) allocated to experimental units according to a randomized complete block design with four replicates and evaluated throughout four contrasting environmental seasons (summer, autumn, winter–early spring and late spring). Under rainy and warm periods, greater net forage accumulation was observed in pastures maintained taller; on the contrary, during the mild and dry periods, net forage accumulation rate reduced as grazing height increased. Such patterns of responses were related to compensations between tiller population density and tissues flows during summer and late spring and the reduced capacity of taller canopies to compensate lower population with greater growth rates during autumn and winter–early spring. Grazed swards changed their patterns of forage growth as they transitioned from favourable to more abiotic stressful conditions, suggesting that seasonal adjustments in grazing intensities are necessary in order to maximize forage production.

中文翻译：

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阐明季节性环境与草食草料生长动态之间的关系

在科学文献中有充分的报道说，如果采用对比结构进行管理，草场的草料净积累量类似。但是，我们假设放牧草地中草料积累的动态与季节-环境条件有关。Marandu palisadegrass（Brachiaria brizantha[赫斯特。[A. Rich。]用作草料种类模型。实验处理是根据随机完整区组设计，将四个放牧高度（10、20、30和40 cm）分配给实验单元，重复四次，并在四个不同的环境季节（夏季，秋季，冬季-初春和晚春）进行评估）。在多雨和温暖的时期，在较高的牧场上观察到了更多的草料净积累。相反，在温和干燥时期，草料净积累率随放牧高度的增加而降低。这种响应方式与夏季和春季末分till种群密度和组织流动之间的补偿以及较高的冠层在秋季和冬季至春季早期以较高的生长速率补偿较低种群的能力降低有关。