垄作直播控制灌溉对水稻产量和温室气体排放的影响

doi:10.3864/j.issn.0578-1752.2023.04.009

Abstract

Abstract:

【Objective】Paddy fields are one of the important sources of greenhouse gas emissions, while farming practices and water management can reduce greenhouse gas emissions from field to a certain extent. Ridge cultivation and direct-seeding is a new kind of rice planting pattern that saves costs and increases economic efficiency. The impact of water management of ridge cultivation and control irrigation on grain yield and greenhouse gas emissions were explored for increasing grain yield and reducing greenhouse gas emissions, so as to provide a theoretical basis and technical approaches for the innovation of high-yield and emission-reduction. 【Method】In this study, a rice-radish rotation system under the ridge cultivation from 2019 to 2021 was conducted to use as the research object. Four treatments were set up, including traditional flooded furrow irrigation (TFI: the height of irrigation was about 5 cm above the ridge), controlled furrow irrigation 1 (CFI1: the height of irrigation was about 5 cm below the ridge), controlled furrow irrigation 2 (CFI2: the height of irrigation was about 10 cm below the ridge), and control furrow irrigation 3 (CFI3: the height of irrigation was about 15 cm below the ridge). The greenhouse gas emissions and global warming potential (GWP) of rice-radish season were investigated by airtight static box-gas chromatography, and the rice yield, soil reducing substances, ammonium nitrogen and nitrate nitrogen were measured. Finally, the optimal irrigation patterns were identified with both reducing the GWP and increasing the rice yield. 【Result】Based on the three-year experimental results, compared with TFI treatment, controlled irrigation could significantly reduce the cumulative emission of CH₄ by 22.81%-78.47% in the rice season, of which CFI3 had the most significant effect; CFI2 treatment significantly increased the cumulative emission of N₂O by 20.45%-59.90%, CFI3 significantly reduced the cumulative N₂O emissions by 12.08%-68.64%, and CFI1 had no significant effect on the cumulative N₂O emissions. For radish season, compared with TFI controlled irrigation could significantly reduce the cumulative emission of CH₄ by 34.87%-53.31%, among which CFI2 and CFI3 had the most significant effects; CFI1, CFI2 and CFI3 treatments could significantly increase the cumulative emission of N₂O by 35.00%-120.00%. The results of two-way ANOVA showed that control irrigation, the interaction of control irrigation and year had an extremely significance on the cumulative emission of CH₄ (P<0.01). The control irrigation, year, the interaction of control irrigation and year had an extremely significance on cumulative N₂O emissions (P<0.01). Compared with TFI, controlled irrigation treatment could significantly reduce GWP by 20.24%-74.87% in rice season; CFI1 and CFI2 treatments increased rice yield by 12.34%-33.97%, CFI3 treatment had no significant effect on yield. Controlling irrigation reduced GHGI by 29.37%-75.92%. Controlled irrigation affected CH₄ emissions by reducing the total amount of reducing substances, active reducing substances and reducing Fe²⁺ by 15.00%-30.84%, 53.45%-71.65% and 60.47%, respectively. It also affected N₂O emissions by reducing NH₄⁺ by 7.51%-9.87% and increasing NO₃^- by 5.81%-8.55%. 【Conclusion】Controlled irrigation affected GHG emissions through soil properties such as NO₃^-, NH₄⁺, and reducing substances. Therefore, CFI1 and CFI2 had the best effects in terms of reducing GWP and increasing rice yield. Under the conditions of ridge cultivation and direct-seeding in paddy field, the depth of irrigation with two-thirds or half of the depth of traditional furrow irrigation flooding was the best water management method to alleviate greenhouse gas emissions and increase rice production.

Key words: ridge cultivation, direct-seeding, water management, greenhouse gas, rice, radish

XIE Jun, YIN XueWei, WEI Ling, WANG ZiFang, LI QingHu, ZHANG XiaoChun, LU YuanYuan, WANG QiuYue, GAO Ming. Effects of Control Irrigation on Grain Yield and Greenhouse Gas Emissions in Ridge Cultivation Direct-Seeding Paddy Field[J].Scientia Agricultura Sinica, 2023, 56(4): 697-710.

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作物类型 Crop type	播种期 Sowing date	收获期 Harvest date	播种期 Sowing date	收获期 Harvest date	播种期 Sowing date	收获期 Harvest date
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温室气体Greenhouse gas	因素Factor	df	F	P
CH₄	控制灌溉Control irrigation	4	547.71	<0.01
	年份 Year	2	2.66	>0.05
	控制灌溉×年份Control irrigation×Year	8	35.11	<0.01
N₂O	控制灌溉 Control irrigation	4	195.40	<0.01
	年份 Year	2	36.26	<0.01
	控制灌溉×年份Control irrigation×Year	8	15.47	<0.01

灌水处理 Irrigation treatment	硝态氮 NO₃^--N (mg·kg^-1)	铵态氮 NH₄⁺-N (mg·kg^-1)	还原物质总量 Total reducing substance (cmol·kg^-1)	活性还原物质 Active reducing substance (cmol·kg^-1)	还原性铁 Reducing Fe (cmol·kg^-1)	还原性锰 Reducing Mn (cmol·kg^-1)
TFI	50.01±3.88b	19.45±0.31a	10.41±1.39a	2.75±0.42a	0.86±0.28a	0.42±0.08a
CFI1	55.31±2.55ab	17.82±1.12b	8.85±0.24b	2.67±0.32a	0.84±0.29a	0.38±0.08a
CFI2	60.47±3.02a	17.53±1.05b	9.14±0.58ab	1.28±0.29b	0.62±0.14a	0.34±0.05a
CFI3	62.37±1.31a	17.99±1.09b	7.20±1.02b	0.78±0.32b	0.34±0.02b	0.31±0.06a

年份 Year	灌水处理 Irrigation treatment	CH₄ (kg·hm^-2)	N₂O (kg·hm^-2)	全球增温潜势 GWP (kg CO₂eq·hm^-2)
2019	TFI	404.73±20.21a	2.27±0.07b	10794.71±601.11a
	CFI1	245.80±9.10b	2.07±0.10b	6791.66±257.30b
	CFI2	188.83±5.12c	3.25±0.13a	5689.34±168.99c
	CFI3	179.27±5.68c	1.33±0.06c	4878.09±159.88d
2020	TFI	430.57±25.24a	2.07±0.07b	11381.11±651.86a
	CFI1	312.73±10.64b	2.09±0.06b	8441.07±283.88b
	CFI2	165.85±2.38c	3.31±0.08a	5132.63±83.34c
	CFI3	92.72±2.28d	1.82±0.05c	2860.36±71.90d
2021	TFI	280.81±9.16a	2.64±0.15b	7806.97±273.70a
	CFI1	216.77±11.46b	2.71±0.14b	6226.83±328.22b
	CFI2	159.73±3.62c	3.18±0.12a	4940.89±126.26c
	CFI3	151.00±4.29c	1.62±0.12c	4257.76±143.01d

Effects of Control Irrigation on Grain Yield and Greenhouse Gas Emissions in Ridge Cultivation Direct-Seeding Paddy Field

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