Scientia Agricultura Sinica ›› 2026, Vol. 59 ›› Issue (7): 1507-1522.doi: 10.3864/j.issn.0578-1752.2026.07.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Green Manure Crops Combined with Enhanced-Efficiency Products Reduced Greenhouse Gas Emissions and Carbon Footprints in Dryland Wheat Fields

ZHU Qi1(), JIA ZhenPeng1, Tahir SHAH1, XU ChenSheng1, LI ZhiQi1, LÜ HuiShuai1, ZHU PengChao1, WEI XiaoMin1, HUANG DongLin1, SUN YanNi2, CAO WeiDong3, GAO YaJun1,4, WANG ZhaoHui1,4,5, ZHANG DaBin1,4,5,*()   

  1. 1 College of Resource and Environment, Northwest A&F University, Yangling 712100, Shaanxi
    2 Agricultural Technology Extension Center in Yongshou, Yongshou 713400, Shaanxi
    3 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081
    4 Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, Shaanxi
    5 State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Yangling 712100, Shaanxi
  • Received:2025-05-31 Accepted:2025-06-26 Online:2026-04-08 Published:2026-04-08
  • Contact: ZHANG DaBin

Abstract:

【Objective】A field experiment was conducted to investigate the effects of green manure (GM) crops combined with enhanced-efficiency products on greenhouse gas emissions (GHGs) and carbon (C) footprints in the dryland summer GM-winter wheat rotation system on the Loess Plateau, so as to provide the theoretical basis and technical parameters for fully tapping the emission reduction and C fixation potential of GM crops, and evaluating its environmental benefits in this cropping system.【Method】The GHGs patterns and net balance of soil C pool in summer GM-winter wheat rotation system of black beans (Phaseolus vulgaris L.) and rapeseed (Brassica napus L.) combined with different enhanced-efficiency products were measured from 2023 to 2024. There were 9 treatments, including: fallow (control), black beans sown alone, black beans + composite biological bacteria (Zaoyijia No.1), black beans + bacterium (Bacillus beresii B22), black beans + sepiolite, rapeseed sown alone, rapeseed + absorbent polymer (Shouke), rapeseed + actinomycetes (Streptomycete rochei D74), and rapeseed + sepiolite, each with 3 replications. C footprints were quantified and evaluated comprehensively, and the suitable GM + product combinations for C sequestration and GHGs emission reduction in drylands were screened.【Result】(1) Compared with black beans sown alone, black beans + bacterium significantly reduced N2O and CO2 emissions, and global warming potential (GWP), with an average decrease of 29.3%, 17.5%, and 17.8%, respectively, reduced 21.6% GHGs intensity (P>0.05), and increased 7.8% wheat yield (P>0.05). (2) Black beans + bacterium showed the highest dry biomass (4 230 kg·hm-2) and C input (1 750 kg·hm-2) and decreased 43.6% (P<0.05) C footprints compared to fallow. (3) Compared with rapeseed sown alone, rapeseed + sepiolite significantly reduced N2O and CO2 emissions, and GWP, with an average decrease of 52.0%, 16.9%, and 17.6%, respectively. (4) Rapeseed + sepiolite showed the highest dry GM biomass (2 723 kg·hm-2) and reduced 27.0% (P<0.05) C footprints compared with fallow.【Conclusion】Introducing the optimized mixture of black beans + bacterium and rapeseed + sepiolite into the summer GM-winter wheat system in the Loess Plateau effectively reduced the GHGs and GWP after incorporating the GM crops, boosted C input, and diminished the C footprints of the crop growth period. This study established a green and clean production model that promoted grain quality, fertilizer use efficiency, C sequestration, and emission reduction, and accelerated the high-quality development of "ecological priority, green and low-carbon" in drylands.

Key words: black beans (Phaseolus vulgaris L.), rapeseed (Brassica napus L.), winter wheat, composite biological bacteria, sepiolite, absorbent polymer, greenhouse gas, carbon footprints

Table 1

The physico-chemical properties of the basic soil at the 0-10 cm and 10-20 cm soil layer"

土层
Soil layer
(cm)
pH 全氮
Total N
(g·kg-1)
全磷
Total P
(g·kg-1)
全钾
Total K
(g·kg-1)
有机质
SOM
(g·kg-1)
有效磷
Available P
(mg·kg-1)
有效钾
Available K
(mg·kg-1)
硝态氮
NO3--N
(mg·kg-1)
铵态氮
NH4+-N
(mg·kg-1)
0-10 8.20 1.00 0.70 20.6 17.2 29.8 77.2 6.05 3.67
10-20 8.18 1.01 0.69 21.1 15.9 25.3 68.0 7.58 2.85

Fig. 1

Precipitation during the summer fallow and winter wheat growing seasons from 2023 to 2024"

Fig. 2

Field gas collection of green manure and winter wheat growth season"

Fig. 3

Time variation of N2O emission flux (A), average N2O flux (B), and cumulative N2O emissions (C) under black beans combined with different enhanced-efficiency products Different lowercase letters indicate significant differences between different treatments (Duncan’s test, P<0.05). The arrows in Fig.3-A represent different field management practices. The black shaded area represents the 95% confidence interval. CK: Fallow, BB: Black beans sown alone, BBCB: Black beans + composite biological bacteria, BBW: Black beans + bacterium, BBH: Black beans + sepiolite. The same as below"

Fig. 4

Time variation of CO2 emission flux (A), average CO2 flux (B), and cumulative CO2 emissions (C) under black beans combined with different enhanced-efficiency products"

Fig. 5

Time variation of N2O emission flux (A), average N2O flux (B), and cumulative N2O emissions (C) under rapeseed combined with different enhanced-efficiency products Different lowercase letters indicate significant differences between different treatments (Duncan’s test, P<0.05). The arrows in Fig.5-A represent the different field management practices. The black shaded area represents the 95% confidence interval. CK: Fallow, RS: Rapeseed sown alone, RSB: Rapeseed + absorbent polymer, RSW: Rapeseed + actinomycetes, RSH: Rapeseed + sepiolite. The same as below"

Fig. 6

Time variation of CO2 emission flux (A), average CO2 flux (B), and cumulative CO2 emissions (C) under rapeseed combined with different enhanced-efficiency products"

Fig. 7

Global warming potential under treatments of GM combined with different enhanced-efficiency products Different lowercase letters indicate significant differences between different treatments of the same GM (Duncan’s test, P<0.05)"

Table 2

Dry biomass and C accumulation of GM, wheat yield and GHGI under treatments of GM combined with different enhanced-efficiency products"

处理
Treatment
绿肥生物量干重
Dry biomass of green manure (kg·hm-2)
绿肥碳还田量
C accumulation of green manure (kg·hm-2)
小麦产量
Wheat yield
(kg·hm-2)
温室气体排放强度
GHGI
(kg·kg-1)
黑麦豆
Black bean
BB 3314.8ab 1202.9b 3963.9b 3.65a
BBCB 2634.7b 1139.1b 4085.9ab 3.54a
BBW 4230.4a 1750.1a 4273.3ab 2.86ab
BBH 3541.9ab 1600.2ab 4845.9ab 2.87ab
休闲 Fallow CK 5682.9a 1.73b
油菜
Rapeseed
RS 2525.7a 965.1a 4596.0a 2.92a
RSB 2650.0a 1097.6a 4718.5a 2.59a
RSW 2706.7a 1063.0a 4264.0a 2.86a
RSH 2722.6a 1061.0a 4256.7a 2.63a

Fig. 8

C inputs and outputs from different sources (A) and C footprints (B) calculated by CO2 equivalent under GM combined with different enhanced-efficiency products The different colors inside the columns in (A) represent the inputs and outputs of C from different sources in the field, with positive values indicating C output and negative values indicating C input. Different lowercase letters indicate significant differences between different treatments of the same GM crops (Duncan’s test, P<0.05)"

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