Although climate change is expected to affect the ecology of many weed species, the nature and scale of these responses is presently not well defined. This presages a suite of potential problems for the agricultural industries. Consequently, we investigated the effects of anticipated climate change on biomass and seed production, for two varieties of wild sage, Salvia verbenaca L. var. verbenaca and Salvia verbenaca var. vernalis Bioss. For the investigation, ambient (400 ppm) and elevated (700 ppm) carbon dioxide conditions, in combination with well-watered (100% field capacity) and drought conditions (60% field capacity), were selected to represent alternative climate scenarios. The alteration in biomass production was represented by a combined measurement of nine variables; plant height, stem diameter, number of leaves, number of branches, leaf area, leaf thickness, shoot biomass, root biomass and dry leaf weight, and fecundity was measured via two variables; 100 seed weight and number of seeds per plant. All biomass measurements were reduced in a drought situation compared with well-watered conditions in ambient carbon dioxide (400 ppm), and each corresponding measurement was greater under elevated carbon dioxide (700 ppm) regardless of water treatment. In contrast, this was not observed for 100 seed weight or number of seeds per plant. Although a similar profile of a reduction in fecundity parameters was observed under drought conditions compared with well-watered conditions in ambient carbon dioxide, there was an increase in seed mass only for var. verbenaca under elevated carbon dioxide in both water treatments. In addition, there was a very small increase in the number of seeds in this species under drought conditions in elevated carbon dioxide, with neither increase in seed mass or seed number being observed in var. vernalis. These results suggest that although future climate change may result in increased competition of both these varieties with desirable plants, their management strategies will need to focus on effects of increased size of the weeds, rather than only attempting to reduce the seed bank holdings.

尽管预计气候变化会影响许多杂草物种的生态，但是目前对这些反应的性质和规模还没有很好的定义。这预示了农业产业的一系列潜在问题。因此，我们调查了两个野生鼠尾草Salvia verbenaca L. var的预期气候变化对生物量和种子产量的影响。马鞭草和丹参马鞭草。疣Bioss。为了进行调查，选择了环境（400 ppm）和升高的（700 ppm）二氧化碳条件，以及水源充足（100％的田间生产能力）和干旱条件（60％的田间生产能力）来代表替代气候情景。生物量生产的变化以九个变量的组合测量为代表。通过两个变量来测量植物高度，茎直径，叶数，枝数，叶面积，叶厚度，枝条生物量，根生物量和干叶重量以及繁殖力。每棵植物的种子重量为100，种子数量为100。与干旱条件下的环境二氧化碳（400 ppm）相比，在干旱情况下所有生物量测量值均降低了，而无论水处理如何，在升高的二氧化碳（700 ppm）下，每个相应的测量值均更高。相反，100粒重或每株种子的种子数未观察到。尽管在干旱条件下与环境二氧化碳充足的条件下观察到的繁殖力参数降低相似，但仅var的种子质量增加。在两种水处理过程中，马鞭草均处于较高的二氧化碳压力下。此外，在干旱条件下二氧化碳含量升高时，该物种的种子数量增加很小，而在var.2中未观察到种子质量或种子数量增加。VERNALIS。这些结果表明，尽管未来的气候变化可能会导致这两个品种与所需植物的竞争加剧，但它们的管理策略将需要集中在杂草大小增加的影响上，而不是仅尝试减少种子库的持有量。