新疆干旱区作物体系土壤温室气体排放对覆膜的响应

doi:10.13866/j.azr.2022.01.18

Abstract

Abstract:

Film mulching is an effective means of improving crop yield on farmland in arid areas; thus, it is widely used in agriculture. Therefore, it is important to explore the effects of film mulching under different crop systems on soil greenhouse gas emissions with the aim of reducing such emissions on farmland. The present study included a plot experiment and in situ observations of greenhouse gas emissions from film mulch-maize soils (MM), film mulch-cotton soils (CM), nonfilm mulch-maize soils (MN) and nonfilm mulch-cotton soils (CN) treated plots. Film mulching significantly increased the soil temperature and water content (P<0.05). The frequency of CH₄ emissions from film mulch-treated (MM and CM) soil was greater than that from nonfilm mulch-treated (MN and CN) soil. The highest emission fluxes of CH₄in each system appeared with the MM and CM treatments at 63.47 μg·m^-2·h^-1 and 16.67 μg·m ^-2·h^-1, respectively. The highest emission fluxes of N₂O occurred under the MM (616.70 μg·m^-2·h^-1) and CN (244.92 μg·m ^-2·h^-1) treatments. The maximum CO₂ emission flux in the soil of maize and cotton plots appeared in July (505.93 g·m^-2·h^-1) and June (848.32 g·m^-2·h^-1), respectively. Subsequently, all treatments showed a downward trend. The soil water content had significant effects on CH₄, N₂O, and CO₂ emissions under both MM and CM treatments (P<0.05). Soil temperature had a significant effect on the CH₄ emissions of MM-treated soil. N₂O emissions following treatment with MM and CM were significantly positively correlated with soil temperature. CO₂ emissions under each treatment were significantly correlated with soil temperature (P<0.05). Crop species and plastic mulching work together on CO₂ emissions. The global warming potential of MM-and MN-treated soils was significantly higher, by around 61.83%-74.63%, than that of CM-and CN-treated soils. Thus, soil greenhouse gas emissions in farmland are affected by the combination of film mulching and crop type. Furthermore, soil greenhouse gas emissions beneath film mulch treatments respond more strongly to hydrothermic factors than the emissions from nonfilm mulch-treated soils.

Key words: arid area farmland, maize, cotton, plastic film mulching, greenhouse gases

WANG Xuyang,LI Dianpeng,SUN Tao,SUN Xia,JIA Hongtao,LI Jun,LI Xinhu. Effects of soil mulching on the greenhouse gas emissions of crops farmland in an arid area of Xinjiang[J].Arid Zone Research, 2022, 39(1): 176-184.

Figures/Tables 7

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References 34

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	变异来源	SS	df	均方	F值	P值
CH₄	作物	0.005	1	0.005	28.772	<0.05
	覆膜	0.001	1	0.001	0.895	>0.05
	作物×覆膜	0.001	1	0.001	0.572	>0.05
	重复测量误差	0.008	44	0.001
N₂O	作物	1.598×10⁴	1	1.598×10⁴	2.353	>0.05
	覆膜	3.337×10³	1	3.337×10³	0.409	>0.05
	作物×覆膜	0.002	1	0.002	0.001	>0.05
	重复测量误差	2.97×10⁵	44	6.755×10³
CO₂	作物	1.775×10⁶	1	1.775×10⁶	110.951	<0.05
	覆膜	0.003	1	0.003	0.409	<0.05
	作物×覆膜	4.489×10⁴	1	4.489×10⁴	2.806	<0.05
	重复测量误差	7.04×10⁵	44	1.6×10⁵

处理	CO₂/（t·hm^-2）	N₂O/（kg·hm^-2）	CH₄/（kg·hm^-2）	GWP/（kg·hm^-2）
CM	16.22±0.17bA	1.74±0.05bB	-0.70±0.02bB	440.30±9.85bB
CN	20.22±0.20aA	2.01±0.14bB	-0.97±0.02bB	506.00±11.26bB
MM	6.90±0.11aB	2.90±0.14aA	-0.17±0.02aA	768.90±15.96aA
MN	7.37±0.11aB	3.11±0.11aA	-0.23±0.0 aA	818.85±14.78aA

Effects of soil mulching on the greenhouse gas emissions of crops farmland in an arid area of Xinjiang

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