School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, China.
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi, China.
J Sci Food Agric. 2019 Sep;99(12):5401-5408. doi: 10.1002/jsfa.9800. Epub 2019 Jun 18.
An irrigation regime is an important factor in regulating soil CO emissions from wheat fields. Deficit irrigation can be applied easily in the fields and has been implemented in northwest China. Previous studies have mainly focused on the effects of deficit irrigation on crop yield and quality. Studies on its environmental impacts are sparse.
Soil CO fluxes from deficit-irrigated fields were lower than those from full irrigation (CK) during most of the growing season. Cumulative soil CO emissions from deficit-irrigated fields were reduced by 10.2-25.5%, compared with the CK. Peaks of soil CO fluxes were observed 3-7 days after irrigation in the water-filled pore space (WFPS) range of 65.7-80.4%. Under different irrigation regimes, significant positive correlations were observed between soil CO fluxes and WFPS (P < 0.01), but no significant correlations were found between soil CO fluxes and soil temperature. Compared to CK, yields for the T1, T2, and T4 were significantly reduced (P < 0.05) but the yield for T3 was only reduced by 2.3% (P > 0.05); T3 significantly reduced soil CO emissions by 10.2% (P < 0.05) and reduced the irrigation water amount by 5.7%.
Deficit irrigation effectively reduced CO emissions from winter wheat field soils. T3 may be a water-saving, CO emission-reducing and high-yield irrigation regime for winter wheat fields in northwest China. The research laid a preliminary theoretical foundation for formulating winter wheat irrigation systems that are water saving, emission reducing, and that produce high yields. © 2019 Society of Chemical Industry.
灌溉制度是调节麦田土壤 CO 排放的重要因素。亏缺灌溉在田间易于实施，已在中国西北地区实施。以前的研究主要集中在亏缺灌溉对作物产量和品质的影响上。关于其环境影响的研究很少。
在生长季节的大部分时间里，亏缺灌溉农田的土壤 CO 通量都低于充分灌溉（CK）。与 CK 相比，亏缺灌溉农田的土壤 CO 累积排放量减少了 10.2-25.5%。在 WFPS（65.7-80.4%）范围内，灌溉后 3-7 天观察到土壤 CO 通量峰值。在不同的灌溉制度下，土壤 CO 通量与 WFPS 呈显著正相关（P<0.01），但与土壤温度无显著相关性。与 CK 相比，T1、T2 和 T4 的产量显著降低（P<0.05），但 T3 的产量仅降低了 2.3%（P>0.05）；T3 显著降低了 10.2%的土壤 CO 排放量（P<0.05），并减少了 5.7%的灌溉水量。
亏缺灌溉有效地减少了冬小麦田土壤的 CO 排放。T3 可能是一种节水、减排、高产的冬小麦灌溉制度，可为中国西北冬小麦灌溉系统的制定提供初步的理论基础。 © 2019 化学工业学会。
