Tree legumes such as Gliricidia sepium (Jacq.) Kunth ex Walp. (Gliricidia) and Mimosa caesalpiniifolia Benth. (Sabia) are important options to enhance drought tolerance of livestock systems and improve the diet of grazing animals. This study assessed productive and nutritional potential of Gliricidia or Sabia in a silvopastoral system (SPS) with signalgrass [Urochloa decumbens (Stapf) R.D Webster]. Treatments were the two SPS allocated in a randomized complete block (three replications). Trees were harvested four times, with 6-month intervals between harvests. Response variables included all dendrometry measurements, dry matter of tree components, chemical composition, δ¹⁵N, δ¹³C, and N derived from the atmosphere (Ndfa). Sabia had greater basal diameter (7.6 ± 1.2 vs. 6.0 ± 1.2 cm; P = 0.045), shaft length (7.5 ± 0.2 vs. 5.5 ± 0.2 cm; P = 0.002), Lorey’s height (7.2 ± 0.3 vs. 5.9 ± 0.3 cm; P = 0.023), tree volume (0.3 ± 0.1 vs. 0.2 ± 0.1 m³; P = 0.014), intermediate branches (14 ± 0.8 vs. 8 ± 0.8 Mg DM/ha; P = 0.004), total leaf biomass (3053 ± 236 vs. 1829 ± 236 kg DM/ha; P = 0.029), dry matter concentration (427 ± 0.4 vs. 252 ± 0.4 g/kg; P = 0.021), lignin (233 ± 0.7 vs. 145 ± 0.7 g/kg DM; P = 0.001), and acid detergent insoluble nitrogen (272 ± 1.2 vs. 168 ± 1.2 g N/kg; P = 0.004). Gliricidia presented greater crude protein (250 ± 0.7 vs. 187 ± 0.7 g/kg DM; P = 0.003), more enriched δ¹³C (−34 ± 0.2 vs. −35 ± 0.2 ‰; P = 0.006), and Ndfa (65 ± 4 vs. 47 ± 4 %; P = 0.041). Sabia demonstrated continued growth and potential to incorporate nutrients into the soil. Gliricidia had greater potential for biological N₂ fixation. Both tree legumes have potential for use in SPS. Gliricidia is recommended when the livestock production is the major goal. Sabia is recommended when timber production is the most desirable activity.

树木豆类，例如Gliricidia sepium（Jacq。）Kunth ex Walp。（Gliricidia）和含羞草caesalpiniifolia Benth。（Sabia）是增强牲畜系统耐旱性和改善放牧动物饮食的重要选择。这项研究评估了草食牧系统（SPS）与信号草[ Urochloa decumbens（Stapf）RD Webster]所产生的念珠菌或Sa虫的生产和营养潜力。处理是在随机完整区块中分配的两个SPS（三个重复）。树木被采伐了四次，两次采伐间隔为6个月。响应变量包括所有dendrometry测量，树成分，化学成分的干物质，δ ¹⁵ N，δ ¹³C，N来源于大气（Ndfa）。bia骨的基底直径更大（7.6±1.2 vs. 6.0±1.2 cm; P  = 0.045），轴长（7.5±0.2 vs. 5.5±0.2 cm; P  = 0.002），Lorey的身高（7.2±0.3 vs. 5.9±0.3）厘米; P  = 0.023），树木体积（0.3±0.1 vs. 0.2±0.1 m ³ ; P  = 0.014），中间枝条（14±0.8 vs. 8±0.8 Mg DM / ha; P  = 0.004），叶片总生物量（3053±236 vs. 1829±236 kg DM / ha; P  = 0.029），干物质浓度（427±0.4 vs. 252±0.4 g / kg; P  = 0.021），木质素（233±0.7 vs.145±0.7）克/千克DM; P  = 0.001）和酸性去污剂不溶氮（272±1.2 vs. 168±1.2 g N / kg;P  = 0.004）。Gliricidia提出了更大的粗蛋白（250±0.7对比187±0.7克/千克DM; P  = 0.003），更富集的δ ¹³ C（-34±0.2 -35对比±0.2‰; P  = 0.006），和NDFA（ 65±4 vs. 47±4％；P  = 0.041）。萨比亚（Sabia）表现出持续的增长，并有潜力将养分掺入土壤。菊科植物具有更大的生物N ₂固定潜力。两种树科植物都有在SPS中使用的潜力。当以畜牧生产为主要目标时，建议使用苦头草。当木材生产是最理想的活动时，建议使用萨比亚。