Impacts of ground-level ozone on sugarcane production.
Impacts of ground-level ozone on sugarcane production.
复制标题
地面臭氧对甘蔗生产的影响。
DOI：
10.1016/j.scitotenv.2023.166817
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Cheesman AW
中科院分区：
文献类型：
--
作者：
Cheesman AW
甘蔗是一种重要的商品作物，通常种植在最近空气质量恶化的（亚）热带地区。与其他商品作物不同，空气污染，特别是臭氧 (O3) 对这种 C4 作物的风险尚未量化。然而，最近的工作强调了 O3 到 C4 生物能源作物的潜在风险，以及热带地区 O3 暴露的出现作为决定全球粮食安全的重要因素。鉴于巴西等地为满足全球对生物燃料的需求而计划大规模扩大甘蔗生产，迫切需要描述 O3对该行业的风险。在这项研究中，我们试图 a) 在一系列现实的 O3 暴露中推导甘蔗 O3 剂量反应函数，b) 模拟这一结果在全球重要生产区的影响。我们发现 O3 对一系列甘蔗基因型的生物量分配（特别是叶子）和生产产生重大影响，包括两个商业相关品种（例如 CTC4、Q240）。利用这些数据，我们计算了甘蔗的剂量响应函数，并将其与源自英国地球系统模型 (UKESM1) 的巴西中南部每小时的 O3 暴露结合起来，使用动态全球植被模型 (JULES vn 5.6) 模拟当前 O3 对甘蔗生产的区域影响。我们发现，由于当前 O3 暴露的直接影响，整个地区的农作物总生产力可能会损失 5.6% 至 18.3%。然而，影响主要取决于甘蔗基因型之间观察到的 O3 敏感性的显着差异以及这些差异在模型中的实施方式。我们的工作不仅强调了充分阐明 O3 对这种重要生物能作物的影响的迫切需要，而且强调了空气质量可能对更广泛的热带粮食生产产生的潜在影响。
Sugarcane is a vital commodity crop often grown in (sub)tropical regions which have been experiencing a recent deterioration in air quality. Unlike for other commodity crops, the risk of air pollution, specifically ozone (O3), to this C4crop has not yet been quantified. Yet, recent work has highlighted both the potential risks of O3to C4bioenergy crops, and the emergence of O3exposure across the tropics as a vital factor determining global food security. Given the large extent, and planned expansion of sugarcane production in places like Brazil to meet global demand for biofuels, there is a pressing need to characterize the risk of O3to the industry. In this study, we sought to a) derive sugarcane O3dose-response functions across a range of realistic O3exposure and b) model the implications of this across a globally important production area. We found a significant impact of O3on biomass allocation (especially to leaves) and production across a range of sugarcane genotypes, including two commercially relevant varieties (e.g. CTC4, Q240). Using these data, we calculated dose-response functions for sugarcane and combined them with hourly O3exposure across south-central Brazil derived from the UK Earth System Model (UKESM1) to simulate the current regional impact of O3on sugarcane production using a dynamic global vegetation model (JULES vn 5.6). We found that between 5.6 % and 18.3 % of total crop productivity is likely lost across the region due to the direct impacts of current O3exposure. However, impacts depended critically on the substantial differences in O3susceptibility observed among sugarcane genotypes and how these were implemented in the model. Our work highlights not only the urgent need to fully elucidate the impacts of O3in this important bioenergetic crop, but the potential implications air quality may have upon tropical food production more generally.