Effects of drip and flood irrigation on carbon dioxide exchange and crop growth in the maize ecosystem in the Hetao Irrigation District, China

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Chaoqun Li, Wenting Han, Manman Peng
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引用次数: 0

Abstract

Drip irrigation and flood irrigation are major irrigation methods for maize crops in the Hetao Irrigation District, Inner Mongolia Autonomous Region, China. This research delves into the effects of these irrigation methods on carbon dioxide (CO2) exchange and crop growth in this region. The experimental site was divided into drip and flood irrigation zones. The irrigation schedules of this study aligned with the local commonly used irrigation schedule. We employed a developed chamber system to measure the diurnal CO2 exchange of maize plants during various growth stages under both drip and flood irrigation methods. From May to September in 2020 and 2021, two sets of repeated experiments were conducted. In each experiment, a total of nine measurements of CO2 exchange were performed to obtain carbon exchange data at different growth stages of maize crop. During each CO2 exchange measurement event, CO2 flux data were collected every two hours over a day-long period to capture the diurnal variations in CO2 exchange. During each CO2 exchange measurement event, the biological parameters (aboveground biomass and crop growth rate) of maize and environmental parameters (including air humidity, air temperature, precipitation, soil water content, and photosynthetically active radiation) were measured. The results indicated a V-shaped trend in net ecosystem CO2 exchange in daytime, reducing slowly at night, while the net assimilation rate (net primary productivity) exhibited a contrasting trend. Notably, compared with flood irrigation, drip irrigation demonstrated significantly higher average daily soil CO2 emission and greater average daily CO2 absorption by maize plants. Consequently, within the maize ecosystem, drip irrigation appeared more conducive to absorbing atmospheric CO2. Furthermore, drip irrigation demonstrated a faster crop growth rate and increased aboveground biomass compared with flood irrigation. A strong linear relationship existed between leaf area index and light utilization efficiency, irrespective of the irrigation method. Notably, drip irrigation displayed superior light use efficiency compared with flood irrigation. The final yield results corroborated these findings, indicating that drip irrigation yielded higher harvest index and overall yield than flood irrigation. The results of this study provide a basis for the selection of optimal irrigation methods commonly used in the Hetao Irrigation District. This research also serves as a reference for future irrigation studies that consider measurements of both carbon emissions and yield simultaneously.

滴灌和漫灌对中国河套灌区玉米生态系统二氧化碳交换和作物生长的影响
滴灌和漫灌是中国内蒙古自治区河套灌区玉米作物的主要灌溉方式。本研究探讨了这些灌溉方式对该地区二氧化碳(CO2)交换和作物生长的影响。实验区分为滴灌区和漫灌区。本研究的灌溉时间表与当地常用的灌溉时间表一致。我们采用开发的试验室系统,测量滴灌和漫灌方式下玉米植株在不同生长阶段的昼夜二氧化碳交换量。2020 年和 2021 年的 5 月至 9 月,我们进行了两组重复实验。每次实验共进行了九次二氧化碳交换测量,以获得玉米作物不同生长阶段的碳交换数据。在每次二氧化碳交换测量过程中,每两小时收集一次全天的二氧化碳通量数据,以捕捉二氧化碳交换的昼夜变化。在每次二氧化碳交换测量期间,还测量了玉米的生物参数(地上生物量和作物生长速率)和环境参数(包括空气湿度、空气温度、降水量、土壤含水量和光合有效辐射)。结果表明,生态系统二氧化碳净交换量在白天呈 "V "字形变化,在夜间缓慢减少,而净同化率(净初级生产力)则呈现出相反的变化趋势。值得注意的是,与大水漫灌相比,滴灌的土壤二氧化碳日均排放量明显更高,而玉米植株的二氧化碳日均吸收量更大。因此,在玉米生态系统中,滴灌似乎更有利于吸收大气中的二氧化碳。此外,与大水漫灌相比,滴灌的作物生长速度更快,地上生物量更高。无论采用哪种灌溉方式,叶面积指数和光利用效率之间都存在很强的线性关系。值得注意的是,与大水漫灌相比,滴灌的光利用效率更高。最终产量结果证实了这些发现,表明滴灌比漫灌的收获指数和总产量更高。研究结果为选择河套灌区常用的最佳灌溉方法提供了依据。这项研究还为今后同时考虑碳排放和产量测量的灌溉研究提供了参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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