| Effects of mulching and drip irrigation on carbon footprint and net ecosystem economic benefits of maize |
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| DOI：10.7606/j.issn.1000-7601.2025.01.20 |
| Key Words: greenhouse gas emissions ridge mulching drip irrigation economic benefits carbon footprint |
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| Abstract: |
| To investigate the comprehensive effects of different mulching and irrigation methods on greenhouse gas emissions, crop yield, net ecosystem economic benefits, and carbon footprint in maize fields, a field experiment was conducted using maize fields with different mulching methods (ridge half\|film and ridge no\|film) and irrigation methods (drip and furrow irrigation). The study aimed to quantify greenhouse gas emissions and analyze irrigation water use efficiency, nitrogen partial factor productivity, economic benefits, and carbon footprint. The results indicated that both drip irrigation and mulching reduced the greenhouse gases peak emissions caused by irrigation and fertilization. Over the two\|year study period, the average N2O, CH4 and CO2 emission flux during the whole growth period were 0.27~0.51, -0.04~-0.05 mg·m-2·h-1 and 2 090.98~2 160.71 mg·m-2·h-1, respectively, which were 12.00%~30.30%, 7.36%~21.45%, and 7.48%~11.68% lower than those under furrow irrigation. For the plastic mulching treatment, the average N2O, CH4 and CO2 emission flux during the whole growth period were 0.27~0.39, -0.03~-0.47 mg·m-2·h-1 and 2 090.98~2 290.50 mg·m-2·h-1, respectively, which were 33.54%~47.35%, 4.03%~19.40% and 2.57%~6.64% lower than those without mulching. This ultimately led to a significantly lower global warming potential of greenhouse gases in the ridge tillage with half\|mulch drip irrigation treatment compared to other treatments (5.30%~16.89%). Additionally, the ridge tillage with half\|mulch drip irrigation mode increased crop yield, water productivity, irrigation water use efficiency, and nitrogen application partial factor productivity by 6.33%~19.83%, 6.10%~33.17%, 14.72%~45.87% and 6.90%~19.44%, respectively. The economic benefit and net ecosystem economic benefit of drip irrigation was increased by 9.37%~14.85% and 43.88%~55.56% respectively compared with furrow irrigation system. The economic benefit and net ecosystem economic benefit of mulching system increased by 0.90%~5.95% and 16.23%~20.88% respectively compared with no\|mulch system. Drip irrigation reduced the total carbon emission and carbon per unit yield during the growing period of maize. In summary, the ridge tillage with half\|mulch drip irrigation method can not only increase maize yield and economic benefits, but also significantly reduce the global warming potential and carbon footprint of greenhouse gases. It is an ideal maize planting method. |
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