Hyptis suaveolens is considered one of the most potent invaders in the eastern part of Uttar Pradesh, India. Climate change especially precipitation variability along with invasion has enormous consequences. To understand how an invasive plant (H. suaveolens) performs and interacts with precipitation variability, particularly in tropical monsoon climate, is vital. To assess the above, three rainout shelters with simulated rainfall of 1600 mm (60% more rainfall than ambient), 1100 mm (average rainfall) and 800 mm (20% less rainfall than ambient) along with one unsheltered plot (open C) were established. Three invaded grassland (IG) and three uninvaded grasslands (NIG) patches of 1 × 1 m² size were established randomly in each sheltered and unsheltered plot. Among the studied physiological properties and growth measurements, photosynthetic rate, height, diameter and biomass varied significantly with precipitation, in general, the maximum value of these in plots receiving maximum precipitation. Also, the aboveground biomass of H. suaveolens was found to be more sensitive towards precipitation treatment than belowground biomass. H. suaveolens biomass was linearly related to soil moisture (R² = 0.73), and a linear combination of SM and soil pH increased the R² value by 19%. The results indicate that H. suaveolens mediates certain soil properties especially related to N-mineralisation, to maintain a constant supply of nutrient, for faster growth under the favourable condition of enhanced precipitation. These findings suggest that the population of H. suaveolens has not evolved drought tolerance, so it is likely that H. suaveolens will not spread in the part of the world which is drier either naturally or due to climate change.

中文翻译：

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降雨变化对Hyptis suaveolens生态生理的影响：对人工热带草原的研究。

肉豆蔻被认为是印度北方邦东部最有力的入侵者之一。气候变化，尤其是降水变化以及入侵会带来巨大的后果。了解入侵植物（H. suaveolens）如何发挥作用并与降水变化发生相互作用，尤其是在热带季风气候下，至关重要。为了评估以上内容，我们制作了三个降雨避难所，它们的模拟降雨量分别为1600 mm（比周围环境多60％），1100 mm（平均降雨量）和800 mm（比周围环境少20％）以及一个无遮蔽的地块（C开口）。成立。1×1 m ^2的三个入侵草原（IG）和三个未入侵草原（NIG）在每个避难所和无避难所地块中随机确定大小。在研究的生理特性和生长测量值中，光合作用速率，高度，直径和生物量随降水量而显着变化，通常，在最大降水量的样地中，这些值的最大值。而且，发现su藜的地上生物量比地下生物量对沉淀处理更敏感。suaveolens的生物量与土壤水分线性相关（R ²  = 0.73），SM和土壤pH的线性组合使R ²值增加了19％。结果表明，H。suaveolens介导某些土壤特性，特别是与氮矿化有关的特性，以保持恒定的养分供应，以便在增加降水的有利条件下更快地生长。这些发现表明，H。suaveolens种群尚未发展出耐旱性，因此，H。suaveolens可能不会在自然干燥或由于气候变化而变干的世界中传播。