Effects of Summer Catch Crop and Biochar Synergy on Carbon and Nitrogen Regulation in Greenhouse Soil

doi:10.7668/hbnxb.20196297

Abstract

Abstract:

In order to the issues of carbon-nitrogen balance and emission reduction in greenhouse soil,a field experiment was carried out to explore the impacts of the combination of summer catch sweet corn and biochar on nitrogen absorption and carbon emission reduction in greenhouse soil.Four treatments were designed for this experiment:control(T1),catch crop(T2),biochar(T3),atch crop+iochar(T4).The research results showed that the dry biomass and nitrogen absorption of T4 corn were 10.18% and 9.49% higher than those of T2,respectively.The organic carbon in the surface soil of T3 and T4 increased by 25.26% and 50.01% compared to before the experiment,respectively.The total nitrogen in the surface layer of T4 decreased by 10.13%,and the C/N increased to 14.9.The nitrate nitrogen in the 60—80 cm and 80—100 cm soil layers of T4 decreased by 13.02% and 5.68% compared to before the experiment,with a significantly greater reduction than other treatments.The non-root microbial biomass carbon and nitrogen of T4 increased by 26.00% and 20.33% compared to the control,with the increase in the non-root area being lower than that in the non-root area.The average CO₂ emission of T4 was 603.90 mg/m³,which was 24.61% lower than that of the control.In summary,the combination of fallow sweet corn and biochar significantly promoted nitrogen absorption,increased microbial biomass carbon and nitrogen,reduced carbon and nitrogen leaching and emissions,and improved soil C/N,providing theoretical basis support for carbon and nitrogen management in the summer fallow period of facility farmland.

Key words: Catch crop planting, Biochar, Nitrogen absorption, Carbon and nitrogen reduction

CLC Number:

ZHAI Kaiyu, LU Shuchang, GUO Liuming, CHEN Qing. Effects of Summer Catch Crop and Biochar Synergy on Carbon and Nitrogen Regulation in Greenhouse Soil[J]. Acta Agriculturae Boreali-Sinica, 2026, 41(1): 155-162. doi: 10.7668/hbnxb.20196297.

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References 42

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处理 Treatment	试验前 Before the experiment	试验后 After the experiment
T1	7.69±0.75a	7.65±0.83b
T2	6.49±0.76b	6.30±1.40b
T3	9.01±0.75a	13.56±0.93a
T4	8.93±0.60a	14.90±0.68a

处理 Treatment	试验前 Before the experiment	试验后 After the experiment
T1	7.69±0.75a	7.65±0.83b
T2	6.49±0.76b	6.30±1.40b
T3	9.01±0.75a	13.56±0.93a
T4	8.93±0.60a	14.90±0.68a

深度/cm Depth	T1		T2		T3		T4
深度/cm Depth	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate
0~20	216.01±12.86b	-73.50	270.63±45.57a	-66.68	245.52±12.89a	-69.98	55.15±7.87c	-93.11
20~40	223.34±22.15b	-64.40	108.35±20.82d	-82.87	475.29±19.28a	-25.43	216.86±12.40c	-65.12
40~60	389.25±32.34b	-26.70	339.29±36.79c	-40.89	532.83±22.84a	-1.44	379.30±30.96b	-30.65
60~80	454.25±9.87b	-3.39	464.55±30.28b	-7.87	541.28±19.00a	14.36	407.98±55.81c	-13.02
80~100	440.38±19.96b	9.39	419.51±12.76c	0.30	497.01±28.55a	21.65	366.93±47.58d	-5.68

深度/cm Depth	T1		T2		T3		T4
深度/cm Depth	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate	硝态氮数量/ (kg/hm²) Nitrate nitrogen quantity	变化率/% Change rate
0~20	216.01±12.86b	-73.50	270.63±45.57a	-66.68	245.52±12.89a	-69.98	55.15±7.87c	-93.11
20~40	223.34±22.15b	-64.40	108.35±20.82d	-82.87	475.29±19.28a	-25.43	216.86±12.40c	-65.12
40~60	389.25±32.34b	-26.70	339.29±36.79c	-40.89	532.83±22.84a	-1.44	379.30±30.96b	-30.65
60~80	454.25±9.87b	-3.39	464.55±30.28b	-7.87	541.28±19.00a	14.36	407.98±55.81c	-13.02
80~100	440.38±19.96b	9.39	419.51±12.76c	0.30	497.01±28.55a	21.65	366.93±47.58d	-5.68

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