Division of Agricultural Physics, ICAR-IARI, New Delhi, 110012, India.
School of Atmospheric Stress Management, ICAR-NIASM, Pune, 413115, India.
Int J Biometeorol. 2021 Nov;65(11):1939-1952. doi: 10.1007/s00484-021-02150-9. Epub 2021 May 28.
An experiment was conducted in the Free Air Ozone and Carbon dioxide Enrichment (FAOCE) facility to study the impact of elevated O, CO and their interaction on chickpea crop (cv. Pusa-5023) in terms of phenology, biophysical parameters, yield components, radiation interception and use efficiency. The crop was exposed to elevated O (EO:60ppb), CO (EC:550 ppm) and their combined interactive treatment (ECO: EC+EO) during the entire growing season. Results revealed that the crop's total growth period was shortened by 10, 14 and 17 days under elevated CO, elevated O and the combined treatment, respectively. Compared to ambient condition, the leaf area index (LAI) under elevated CO was higher by 4 to 28%, whilst it is reduced by 7.3 to 23.8% under elevated O. The yield based radiation use efficiency (RUE) was highest under elevated CO (0.48 g MJ), followed by combined (0.41 g MJ), ambient (0.38 g MJ) and elevated O (0.32 g MJ) treatments. Elevated O decreased RUE by 15.78% over ambient, and the interaction results in a 7.8% higher RUE. The yield was 31.7% more under elevated CO and 21.9% lower in elevated O treatment as compared to the ambient. The combined interactive treatment recorded a higher yield as compared to ambient by 9.7%. Harvest index (HI) was lowest under elevated O (36.10%), followed by ambient (39.18%), combined (40.81%), and highest was under elevated CO (44.18%). Chickpea showed a positive response to elevated CO resulting a 5% increase in HI as compared to ambient condition. Our findings quantified the positive and negative impacts of elevated O, CO and their interaction on chickpea and revealed that the negative impacts of elevated O can be compensated by elevated CO in chickpea. This work promotes the understanding of crop behaviour under elevated O, CO and their interaction, which can be used as valuable inputs for radiation-based crop simulation models to simulate climate change impact on chickpea crop.
在自由空气臭氧和二氧化碳增浓（FAOCE）设施中进行了一项实验，以研究在整个生长季节中，升高的 O、CO 及其相互作用对鹰嘴豆作物（品种 Pusa-5023）的物候学、生物物理参数、产量构成、辐射截获和利用效率的影响。该作物暴露于升高的 O（EO：60ppb）、CO（EC：550ppm）及其组合交互处理（ECO：EC+EO）下。结果表明，在升高的 CO、升高的 O 和组合处理下，作物的总生长周期分别缩短了 10、14 和 17 天。与环境条件相比，升高的 CO 下的叶面积指数（LAI）增加了 4%至 28%，而升高的 O 下则减少了 7.3%至 23.8%。基于辐射利用效率（RUE）的产量最高，在升高的 CO 下（0.48gMJ），其次是组合处理（0.41gMJ）、环境条件（0.38gMJ）和升高的 O（0.32gMJ）处理。升高的 O 使 RUE 相对于环境条件降低了 15.78%，而交互作用使 RUE 提高了 7.8%。与环境条件相比，升高的 CO 下的产量增加了 31.7%，升高的 O 下的产量降低了 21.9%。组合交互处理的产量比环境条件下高 9.7%。在升高的 O 下的收获指数（HI）最低（36.10%），其次是环境条件（39.18%）、组合处理（40.81%）和最高的是升高的 CO（44.18%）。鹰嘴豆对升高的 CO 表现出积极的响应，与环境条件相比，HI 增加了 5%。我们的研究结果量化了升高的 O、CO 及其相互作用对鹰嘴豆的正负影响，表明升高的 O 的负面影响可以被鹰嘴豆中升高的 CO 所补偿。这项工作促进了对作物在升高的 O、CO 及其相互作用下的行为的理解，可为基于辐射的作物模拟模型提供有价值的输入，以模拟气候变化对鹰嘴豆作物的影响。
