Stylosanthes capitata Vogel is a C3 forage legume widely cultivated in tropical and subtropical pastures. However, the nutrient dynamics of this species under future climate change is unknown. Therefore, this study aimed to evaluate the nutrient content, nutrient accumulation, nutrient use efficiency and growth of S. capitata exposed to increased [CO₂] and temperature under field conditions using two levels of atmospheric [CO₂] (ambient and elevated—600 ppm) and two canopy temperature (ambient and elevated—2°C). Treatments were applied at field conditions, for 30 days, using a free‐air carbon dioxide enrichment (FACE) and a free‐air temperature‐controlled enhancement (T‐FACE) systems. Warming showed no effects on macronutrient content, but increased the accumulation of nitrogen, potassium, calcium, magnesium and sulphur, the nutrient use efficiency and root dry mass. Elevated [CO₂] alone had no effect on most of the parameters evaluated. However, the combination of elevated [CO₂] with warming improved the nutrient accumulation, nutrient use efficiency and whole‐plant growth more than under isolated conditions of elevated [CO₂] or warming. Based on our short‐term results, we concluded that an increment of atmospheric [CO₂] and temperature will benefit S. capitata growth, suggesting no alterations in the actual fertilizer programs for this species.

中文翻译：

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在田间条件下，升高的[CO2]和变暖增加了Stylosanthes capitata Vogel的养分利用率和生物量

Stylosanthes capitata Vogel是一种C3饲用豆科植物，广泛种植于热带和亚热带牧场中。然而，该物种在未来气候变化下的营养动态尚不清楚。因此，本研究的目的是评估营养含量，营养积累，养分利用效率和生长的S.结球甘蓝暴露于增加的[CO ₂用的大气两级[CO]和温度下现场条件₂]（环境和高温-600 ppm）和两个顶篷温度（环境和高温-2°C）。使用自由空气二氧化碳浓缩（FACE）和自由空气温度控制增强（T-FACE）系统在田间条件下进行处理30天。增温对常量营养元素含量没有影响，但增加了氮，钾，钙，镁和硫的积累，养分利用效率和根系干重。单独的[CO ₂ ]升高对大多数评估参数没有影响。但是，[CO ₂ ]升高与增温相结合，比单独的[CO _2]升高条件下改善了养分积累，养分利用效率和整株植物生长]或变暖。根据我们的短期结果，我们得出结论，大气中[CO ₂ ]和温度的增加将有利于人参（S. capitata）的生长，表明该物种的实际施肥计划未发生变化。