Effect of Returning Organic Materials on Greenhouse Gas Emissions and Rice Yield in Paddy Soil

doi:10.11924/j.issn.1000-6850.casb2024-0377

Abstract

Abstract:

Elucidating the effect of returning organic materials on paddy soil greenhouse gas emissions and rice yield is vital for farmland soil carbon management. Rice straw and its biochar were used as research objects to explore the change of early rice yield, greenhouse gas emission and soil physicochemical properties under the same carbon input condition. The results showed that compared with the control treatment, the early rice yield in straw and biochar returning treatments increased by 4.71% and 17.2%, respectively. Biochar returning significantly reduced the greenhouse gas emission intensity of paddy soils (P<0.05), while straw returning significantly increased CH₄ emission flux, greenhouse effect index and greenhouse gas emission intensity (P<0.05). Biochar returning can both increase the early rice yield and decrease the greenhouse gas emissions in paddy soil. However, straw returning has a limited effect on rice yield increase and exhibits a high risk of environmental greenhouse effect.

Key words: crop straw, biochar, yield, greenhouse effect, low-carbon agriculture, organic matter return to field, greenhouse gas emissions, soil physicochemical properties

XU Jianming, WANG Yanhong, LIU Zhongzhen, ZHENG Xiaodong. Effect of Returning Organic Materials on Greenhouse Gas Emissions and Rice Yield in Paddy Soil[J]. Chinese Agricultural Science Bulletin, 2024, 40(36): 95-101.

Figures/Tables 5

References 40

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处理	N₂O累积排放/(kg/hm²)	CH₄累积排放/(kg/hm²)	全球增温潜势/(kg/hm²)	排放强度/(kg/kg)
对照	1.14±0.23 a	216.7±14.0 b	5758±332 b	0.88±0.05 b
秸秆还田	1.57±0.17 a	899.7±119.5 a	22959±2958 a	3.32±0.40 a
生物炭还田	1.30±0.19 a	178.4±12.5 b	4848±317 b	0.64±0.05 c

处理	N₂O累积排放/(kg/hm²)	CH₄累积排放/(kg/hm²)	全球增温潜势/(kg/hm²)	排放强度/(kg/kg)
对照	1.14±0.23 a	216.7±14.0 b	5758±332 b	0.88±0.05 b
秸秆还田	1.57±0.17 a	899.7±119.5 a	22959±2958 a	3.32±0.40 a
生物炭还田	1.30±0.19 a	178.4±12.5 b	4848±317 b	0.64±0.05 c

处理	土壤pH	土壤有机质SOM/ (g/kg)	全氮TN/ (g/kg)	碱解氮AN/ (mg/kg)	全磷TP/ (g/kg)	速效磷AP/ (mg/kg)	全钾TK/ (g/kg)	速效钾AK/ (mg/kg)
对照	5.98±0.05 a	25.2±1.09 a	1.29±0.09 a	100.7±4.74 a	0.67±0.02 a	67.8±3.02 a	6.85±0.09 a	109.7±11.5 a
秸秆还田	6.02±0.05 a	25.0±1.30 a	1.30±0.05 a	98.3±4.29 a	0.66±0.02 a	61.8±1.36 a	6.80±0.10 a	127.5±9.07 a
生物炭还田	6.04±0.06 a	26.1±1.07 a	1.22±0.08 a	96.2±2.83 a	0.65±0.02 a	67.5±2.77 a	6.77±0.09 a	115.6±8.81 a

处理	土壤pH	土壤有机质SOM/ (g/kg)	全氮TN/ (g/kg)	碱解氮AN/ (mg/kg)	全磷TP/ (g/kg)	速效磷AP/ (mg/kg)	全钾TK/ (g/kg)	速效钾AK/ (mg/kg)
对照	5.98±0.05 a	25.2±1.09 a	1.29±0.09 a	100.7±4.74 a	0.67±0.02 a	67.8±3.02 a	6.85±0.09 a	109.7±11.5 a
秸秆还田	6.02±0.05 a	25.0±1.30 a	1.30±0.05 a	98.3±4.29 a	0.66±0.02 a	61.8±1.36 a	6.80±0.10 a	127.5±9.07 a
生物炭还田	6.04±0.06 a	26.1±1.07 a	1.22±0.08 a	96.2±2.83 a	0.65±0.02 a	67.5±2.77 a	6.77±0.09 a	115.6±8.81 a