Scientia Agricultura Sinica ›› 2025, Vol. 58 ›› Issue (20): 4203-4215.doi: 10.3864/j.issn.0578-1752.2025.20.013

• ECOLOGICAL UTILIZATION OF SALINE-ALKALI LAND • Previous Articles     Next Articles

Winter Green Manure Enhances Soil Aggregation and Plant- and Microbial-Derived Carbon Sequestration in Coastal Saline-Alkali Soils

JIN XiaoYing1(), XIAO BingZheng1, ZHANG TianJin2, LIU ZhongKuan3, FENG Wei3(), DU ZhangLiu1,4()   

  1. 1 College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193
    2 Huantai County Agriculture and Rural Affairs Bureau, Zibo 256400, Shandong
    3 Institute of Agricultural Resources and Environment, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051
    4 National Center of Technology Innovation for Comprehensive Utilization of Saline- Alkali Land, Dongying 257347, Shandong
  • Received:2025-08-28 Accepted:2025-09-27 Online:2025-10-16 Published:2025-10-14
  • Contact: FENG Wei, DU ZhangLiu

Abstract:

【Objective】This study aimed to investigate the characteristics of soil aggregation and molecular origins of soil organic matter (SOM) under winter green manure cropping systems, in order to establish a scientific foundation for organic matter sequestration and soil quality improvement in saline-alkali soils. 【Method】 The field experiment, initiated in 2019 in Huanghua County of Hebei Province, involved four treatments: winter fallow (CK), Orychophragmus violaceus (OV), Triticale (TG), and winter wheat (WW). The relative contributions of SOM from different origins and related factors were elucidated. Three biomarkers - lignin phenols, glomalin-related soil protein (GRSP), and microbial necromass carbon (MNC) - were conducted to quantitatively distinguish plant- and microbial-derived organic matter components. 【Result】 Green manure generally increased soil organic carbon (SOC) storage by 12.2%-21.8% (only TG showing significant difference) and total nitrogen storage by 22.5%-36.4% compared with CK. Additionally, green manure treatments enhanced the proportion of larger macroaggregates (>2-8 mm) by 1.9-6.2 times and smaller macroaggregates (0.25-2 mm) by 12.4%-74.6%, relative to CK. The OV, TG, and WW treatments increased the mean weight diameter of aggregates by 26.7%, 86.4%, and 113.8%, respectively, compared with CK. The OV, TG, and WW also exhibited a 16.3%, 57.3%, and 86.4% higher proportion of water-stable macroaggregates (>0.25 mm) than that under CK, respectively. Moreover, the OV enhanced concentrations of vanillyl by 37.7% and cinnamyl by 149.7%, compared with CK. The OV, TG, and WW treatments increased total lignin phenols by 74.6%, 32.9%, and 38.4%, respectively, relative to CK. Besides, TG had 36.5% higher easily extractable GRSP than that under CK. TG treatment increased total MNC by 60.6% compared with CK. Again, TG had higher contributions of bacterial necromass C (19%), fungal necromass C (38%), and microbial necromass C to SOC (57%), and the contributions of microbial-derived carbon to SOC was higher than that of plant-derived across green manure treatments. 【Conclusion】 It was concluded that adoption of winter green manure increased soil aggregation and promoted the accumulation of microbial-derived carbon, potentially boosting soil quality and C sequestration in the coastal saline soils.

Key words: saline-alkali soils, green manure, microbial necromass, plant-derived lignin, aggregates, soil organic carbon sequestration

Table 1

Concentrations, storages and ratio of soil organic carbon (SOC) and total nitrogen (TN) as influenced as by green manure cropping systems"

处理
Treatments
容重
Bulk density (g·cm-3)
含量 Concentrations (g·kg-1) 碳氮比
SOC/TN
储量 Storage (Mg·hm-2)
土壤有机碳SOC 全氮 TN SOC TN
CK 1.16±0.03a 9.96±0.70b 0.85±0.07b 11.71±0.19a 20.43±1.43b 1.75±0.15b
OV 1.06±0.03a 11.18±0.51ab 1.04±0.06a 10.71±0.09b 22.92±1.06ab 2.14±0.12a
TG 1.05±0.04a 12.13±0.30a 1.16±0.02a 10.45±0.42b 24.88±0.61a 2.38±0.04a
WW 1.07±0.07a 11.42±0.57ab 1.09±0.04a 10.49±0.13b 23.41±1.17ab 2.23±0.09a

Table 2

Soil salinity related parameters as influenced as by green manure cropping systems"

处理 Treatments pH 水土比2.5:1 EC (dS·m-1) CEC (cmol·kg-1) SAR ((mmol·L-1)1/2) CROSS ((mmol·L-1)1/2)
CK 8.40±0.03a 0.139±0.01b 6.55±0.24a 0.70±0.07a 0.75±0.07a
OV 8.21±0.06ab 0.141±0.01b 5.88±0.24a 0.71±0.03a 0.79±0.02a
TG 8.10±0.02ab 0.122±0.01b 6.09±0.15a 0.53±0.04b 0.60±0.03b
WW 7.80±0.06b 0.193±0.02a 6.11±0.07a 0.68±0.06a 0.74±0.06a

Fig. 1

Aggregate size distribution, stability, and related binding agents as influenced as by green manure cropping systems"

Fig. 2

Lignin phenols monomer and related degradation parameters as influenced as by green manure cropping systems"

Fig. 3

Microbial necromass carbon and their contributions to soil organic C, as well as total glomalin-related soil protein (T-GRSP) as influenced as by green manure cropping systems"

Fig. 4

Schematic diagram of the feedback mechanism between soil aggregation and organic matter chemical components induced by winter green manure cropping systems"

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