Scientia Agricultura Sinica ›› 2026, Vol. 59 ›› Issue (18): 4092-4104.doi: 10.3864/j.issn.0578-1752.2026.18.011

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

Dynamics of Black Soil Labile Carbon Fractions and Carbon- Hydrolyzing Enzymes Under Long-Term Fertilization Regimes

HAN XiaoYu1,2(), ZHU YuPing2, LIU HongFang2, SUN ZhiMei1(), ZHANG XiuZhi3, GAO HongJun3, PENG Chang3, ZHANG ShuXiang2()   

  1. 1 College of Resources and Environmental Sciences, Hebei Agricultural University/Key Laboratory of Farmland Ecological Environment in Hebei Province, Baoding 071000, Hebei
    2 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Beijing 100081
    3 Institute of Agricultural Resource and Environment, Jilin Academy of Agricultural Sciences, Changchun 130033
  • Received:2025-10-31 Accepted:2026-01-24 Online:2026-09-16 Published:2026-09-20
  • Contact: SUN ZhiMei, ZHANG ShuXiang

Abstract:

【Objective】This study investigated the dynamics and interrelationships between soil labile carbon fractions and carbon-hydrolyzing enzymes under long-term fertilization practices, aiming to provide a theoretical basis for enhancing black soil fertility and optimizing fertilization strategies in Northeast China.【Method】A long-term fertilization experiment established in 1989 in Gongzhuling, Jilin Province, was utilized. Soil samples were collected from five treatments: no fertilization (CK), nitrogen and potassium fertilization (NK), nitrogen-phosphorus-potassium fertilization (NPK), NPK plus straw return (NPKS), and NPK plus manure (NPKM). Measurements included soil nutrients, activities of amylase (AMY), sucrase (SUC), cellobiohydrolase (CBH), β-1,4-glucosidase (βG), and content of particulate organic carbon (POC), easily oxidizable organic carbon (EOC), dissolved organic carbon (DOC), and microbial biomass carbon (MBC). Data were analyzed using ANOVA, correlation analysis, Mantel tests, and partial least squares path modeling to elucidate changes and underlying linkages.【Result】Compared with CK, the NPKM treatment demonstrated the most comprehensive improvement in soil organic carbon and its active components. Soil organic carbon (SOC) content increased by 6.7 g·kg-1, while POC, EOC, MBC, and DOC content was significantly increased by 2.5 g·kg-1, 3.0 g·kg-1, 97.5 mg·kg-1, and 14.1 mg·kg-1, respectively, with the geometric mean of active carbon also rising substantially by 50.1%. Under the NPKS treatment, SOC, POC, and MBC content was also increased significantly by 2.3 g·kg-1, 1.5 g·kg-1, and 93.0 mg·kg-1, respectively. In contrast, both the NPK and NK treatments reduced POC and MBC content, with the geometric mean of active carbon decreasing by 24.7% and 26.8%, respectively. The carbon pool management index increased significantly only under the NPKM treatment by 55.9% compared with CK, while the carbon pool activity decreased significantly by 33.6% under the NK treatment. Regarding enzyme activity, all fertilization treatments enhanced AMY activity compared with CK. Additionally, the NK and NPK treatments significantly increased CBH and βG activities, with the NK treatment showing the greatest increase: CBH rose by 167.3 μmol·g-1·h-1 and βG by 457.7 μmol·g-1·h-1. In terms of soil nutrients, the NPKM treatment significantly increased total nitrogen (TN), total phosphorus (TP), available phosphorus (AP), and available potassium (AK) content, with increases of 0.72 g·kg-1, 1.85 g·kg-1, 148.9 mg·kg-1, and 402.1 mg·kg-1, respectively, compared with CK. Conversely, the NK treatment resulted in a significant decrease in pH by 2 units and a reduction in TP content by 0.2 g·kg-1. Furthermore, the NK treatment increased soil C:P and N:P, while other fertilization treatments generally decreased C:N, C:P, and N:P. Correlation and path analysis indicated that soil TN, TP, AP, and AK directly promoted the accumulation of POC, EOC, and MBC. In contrast, higher C:P and N:P stimulated CBH and βG activities, thereby accelerating carbon decomposition and mineralization, which inhibited the accumulation of POC, EOC, and MBC.【Conclusion】Long-term combined application of chemical fertilizers with organic amendments not only improved soil nutrient content but also increased labile organic carbon by optimizing nutrient balance and modulating carbon-hydrolyzing enzyme activities. Thus, integrating organic manure with fertilizers represents the optimal strategy for enhancing black soil fertility in Northeast China.

Key words: black soil, long-term fertilization, combined organic-inorganic fertilization, carbon cycle enzymes, carbon pool stability, soil organic carbon components

Table 1

Overview of fertilization rate in the long-term positioning experiment"

处理
Treatment
化肥投入
Inorganic fertilizer input N-P-K (kg∙hm-2)
有机物料投入
Organic material input N-P-K (kg∙hm-2)
CK 0-0-0 0-0-0
NK 165-0-68 0-0-0
NPK 165-36-68 0-0-0
NPKS 112-36-68 53-6-77
NPKM 50-36-68 115-39-77

Fig. 1

Effects of different fertilization practices on soil carbon pool components Different lowercase letters indicate significant differences among treatments at the 0.05 level. The same as below"

Fig. 2

Effects of different fertilization practices on soil carbon pool quality"

Fig. 3

Effects of different fertilization practices on soil carbon hydrolase activity"

Table 2

Effects of different fertilization practices on soil nutrients"

处理 酸碱度
pH
全氮
TN (g∙kg-1)
全磷
TP (g∙kg-1)
全钾
TK (g∙kg-1)
有效磷
AP (mg∙kg-1)
速效钾
AK (mg∙kg-1)
碳氮比
C:N
碳磷比
C:P
氮磷比
N:P
CK 7.76±0.32a 1.25±0.04cd 1.03±0.04c 20.61±0.45a 7.39±0.51d 191.30±8.77b 11.87±0.78a 14.45±1.47b 1.22±0.06b
NK 5.76±0.13d 1.36±0.02bc 0.84±0.05d 20.54±0.60a 8.41±1.16d 208.03±10.48b 11.00±0.15b 17.74±1.01a 1.61±0.08a
NPK 6.44±0.14c 1.22±0.04d 1.13±0.04c 20.61±0.28a 26.22±0.91b 202.01±8.92b 10.95±0.07b 11.80±0.34c 1.08±0.02c
NPKS 7.92±0.04a 1.45±0.08b 1.51±0.05b 20.58±0.16a 17.46±1.1c 209.71±6.05b 11.85±0.28a 11.32±0.44c 0.96±0.04d
NPKM 7.30±0.19b 1.97±0.12a 2.88±0.13a 21.22±0.16a 156.33±10.42a 255.89±17.57a 10.91±0.19b 7.47±0.24d 0.68±0.01e

Fig. 4

Relationship between soil nutrient and carbon components and carbon pool stability SOC: Soil organic carbon, TN: Total nitrogen, TP: Total phosphorus, TK: Total potassium, AP: Available phosphorus, AK: Available potassium, CBH: Cellobiohydrolase, βG: β-1,4-glucosidase, SUC: Sucrase, AMY: Amylase, A: Labile carbon pool activity, AI: Labile carbon pool activity index, CPI: Carbon pool index, CPMI: Carbon pool management index, POC: Particulate organic carbon, EOC: Easily-oxidized organic carbon, MBC: Microbial biomass carbon, DOC: Dissolved organic carbon. The same as below"

Fig. 5

Influence pathways of soil nutrient and enzyme activity on soil organic carbon components and carbon pool management index ***: P<0.001, **: P<0.01, *: P<0.05"

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