CO 2 and N 2 O Emissions from Spring Maize Soil under Alternate Irrigation between Saline Water and Groundwater in Hetao Irrigation District of Inner Mongolia, China

Yu Wang, Peiling Yang, Shumei Ren, Xin He, Chenchen Wei, Shuaijie Wang, Yao Xu, Ziang Xu, Yanxia Zhang and Hassan Ismail
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Yu Wang: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Peiling Yang: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Shumei Ren: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Xin He: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Chenchen Wei: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Shuaijie Wang: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Yao Xu: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Ziang Xu: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Yanxia Zhang: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Hassan Ismail: Department of Civil and Environmental Engineering, Penn State University, University Park, PA 16801, USA

IJERPH, 2019, vol. 16, issue 15, 1-14

Abstract: Alternative irrigation between saline water and groundwater can alleviate shortages of available agricultural water while effectively slowing the adverse effects of saline water on the soil-crop system when compared with continuous irrigation with saline water and blending irrigation between saline water and groundwater. In 2018, we tested the effect on soil CO 2 and N 2 O emissions by two types of irrigation regimes (alternating groundwater and saline water (GW-SW), and alternating groundwater, followed by two cycles of saline water (GW-SW-SW)) between groundwater and three levels of salinity of irrigation water (mineralization of 2 g/L, 3.5 g/L, and 5 g/L), analyzed the correlation between gas emissions and soil properties, calculated comprehensive global warming potential (GWP), and investigated the maize yield. The results show that, with the same alternate irrigation regime, cumulative CO 2 emissions decreased with increasing irrigation water salinity, and cumulative N 2 O emissions increased. Cumulative CO 2 emissions were higher in the GW-SW regime for the same irrigation water salinity, and cumulative N 2 O emissions were higher in the GW-SW-SW regime. The GW-SW-SW regime had less comprehensive GWP and maize yield as compared to the GW-SW regime. The 2 g/L salinity in both regimes showed larger comprehensive GWP and maize yield. The 3.5 g/L salinity under the GW-SW regime will be the best choice while considering that the smaller comprehensive GWP and the larger maize yield are appropriate for agricultural implication. Fertilizer type and irrigation amount can be taken into consideration in future research direction.

Keywords: irrigation water salinity; alternate irrigation regime; greenhouse gas emission; soil properties; global warming potential (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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