Effects of green manure return regimes on soil greenhouse gas emissions

doi:10.11686/cyxb2020431

Abstract

Abstract:

There is little published data on the impact on subsequent greenhouse gas emissions of different green manure types and return regimes. To address this knowledge gap， a 91-day laboratory incubation experiment was conducted to explore the greenhouse gas emission impacts of green manure types and return regimes. In this study， two green manure species （vetch and ryegrass） with contrasting herbage C∶N ratios were incubated in two different return regimes （surface mulching and burial） to compare soil greenhouse gas emission of the four treatment combinations. Green manure return significantly increased soil CO₂ and N₂O emissions at all stages of the 91-day incubation period， and soil CO₂ and N₂O gas emissions also differed significantly between return regimes （surface mulching or burial） and plant species （vetch or ryegrass）. The CO₂ emissions associated with surface mulching were significantly lower than those following burial. During the incubation period， surface mulching reduced the CO₂emission rate and cumulative total emission by 17.07%-18.55% and 8.15%-9.79%， respectively， and reduced N₂O emission rate and cumulative emission by 22.91%-38.35% and 17.97%-34.39%， respectively， compared to burial. For a given return method， green manure species significantly affected CO₂ and N₂O emissions. The cumulative emissions of CO₂ and N₂O following leguminous green manure return were 8.87%-10.85% and 21.90%-52.42% higher， respectively， than those of Poaceous green manure. There was a significant positive correlation between greenhouse gas emissions and soil microbial biomass carbon and nitrogen （MBC， MBN） in each treatment. Compared with surface mulching， green manure burial increased MBC by 21.42%-40.52% and MBN by 28.22%-34.23% （P<0.05）. To sum up， green manure mulching can reduce greenhouse gas emissions more effectively than ploughing， and is thus conducive to protecting the ecological environment and saving labor costs， but the impact on crop growth and yield needs to be verified by field experiments.

Key words: green manure, returning regimes, greenhouse gas

Xue-liang ZHANG, Yu-ting ZHANG, Rui LIU, Jun XIE, Jian-wei ZHANG, Wen-jing XU, Xiao-jun SHI. Effects of green manure return regimes on soil greenhouse gas emissions[J]. Acta Prataculturae Sinica, 2021, 30(5): 25-33.

Figures/Tables 6

References 31

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绿肥Green manure	碳Carbon (%DM)	氮Nitrogen (%DM)	磷Phosphorus (%DM)	钾Potassium (%DM)	碳氮比C/N
多年生黑麦草L. perennel	47.19±1.75	2.03±0.26	0.53±0.03	4.26±0.19	23.24±2.57
光叶苕子V. villosa	43.46±1.09	3.91±0.13	0.50±0.04	5.12±0.17	11.11±0.36

绿肥Green manure	碳Carbon (%DM)	氮Nitrogen (%DM)	磷Phosphorus (%DM)	钾Potassium (%DM)	碳氮比C/N
多年生黑麦草L. perennel	47.19±1.75	2.03±0.26	0.53±0.03	4.26±0.19	23.24±2.57
光叶苕子V. villosa	43.46±1.09	3.91±0.13	0.50±0.04	5.12±0.17	11.11±0.36

项目 Item	增温潜势Warming potential			综合增温潜势 Comprehensive GWP
项目 Item	CO₂	CH₄	N₂O	综合增温潜势 Comprehensive GWP
VB	6.19a	-0.0089a	1.55a	7.73a
VS	5.04c	-0.0061b	0.96b	5.99c
RB	5.58b	-0.0039b	1.02b	6.60b
RS	4.63d	-0.0010c	0.78c	5.42d
CK	1.34e	0.0018d	0.21d	1.55e

项目 Item	增温潜势Warming potential			综合增温潜势 Comprehensive GWP
项目 Item	CO₂	CH₄	N₂O	综合增温潜势 Comprehensive GWP
VB	6.19a	-0.0089a	1.55a	7.73a
VS	5.04c	-0.0061b	0.96b	5.99c
RB	5.58b	-0.0039b	1.02b	6.60b
RS	4.63d	-0.0010c	0.78c	5.42d
CK	1.34e	0.0018d	0.21d	1.55e

项目Item	N₂O	CH₄	增温潜势GWP	微生物量碳MBC	微生物量氮MBN
CO₂	0.930**	-0.824**	0.997**	0.878**	0.915**
N₂O		-0.895**	0.955**	0.943**	0.976**
CH₄			-0.848**	-0.926**	-0.947**
增温潜势GWP				0.901**	0.938**
微生物量碳MBC					0.977**