TY - JOUR

T1 - Inorganic carbon accumulation in saline soils via modification effects of organic amendments on dissolved ions and enzymes activities

AU - Song, Jiashen

AU - Zhang, Hongyuan

AU - Zamanian, Kazem

AU - Chang, Fangdi

AU - Yu, Ru

AU - Wang, Jing

AU - Zhou, Jie

AU - Li, Yuyi

N1 - This study was supported by the National Key R&D Program of China (2023YFD2001400), the National Natural Science Foundation of China (No. U23A2054), the Agricultural Science and Technology Innovation Program (ASTIP No. CAAS-ZDRW202407), the earmarked fund for CARS-02-24, “Open the list” in charge of the science and technology project of Ordos (JBGS-2021-001), German Research Foundation (DFG, ZA 1068/4) and Ministry of Science and Culture of Lower-Saxony, Germany (15-76251-2—Stay-8/22- 5947/2022).

PY - 2024/6

Y1 - 2024/6

N2 - Organic amendments are effective in promoting salt leaching, improving availability of nutrients and increasing crop yield in saline soils. However, the effects of the combined application of organic amendments on soil inorganic carbon (SIC) content and its driving mechanisms are unknown. We examined how changes in soil biochemical properties including moisture content, pH value, dissolved ions, soil organic C (SOC), dissolved organic C (DOC), microbial biomass C (MBC), and activities of C- and N-related enzyme due to applying (i) only mineral fertilizers (control; Ctrl) or mineral fertilization in combination with (ii) manure (M); (iii) biofertilizer plus manure (B+M); and (iv) humic acid plus manure (HA+M) modify SIC pool over three years. Organic amendments increased the content of Ca 2+ and HCO 3 – ions, but significantly decreased Na +, Cl −, and SO 4 2− at 0–60 cm soil layers compared to Ctrl. Furthermore, the activities of β-glucosidase (BG), Xylanase (BX), Cellobiosidase (CE), and β-1,4-N-Acetyl-glucosaminidase (NAG) increased at 0–40 cm soil. Partial least squares path model manifested that organic amendment directly accumulated SIC content by increasing Ca 2+ content and the activities of BX and NAG. Additionally, the decrease of Cl − contents under organic amendments favored the increase of MBC and SOC content, which further increased SIC content. Generally, the effects of HA+M were greater than other fertilization managements, which increased the stocks of SIC and total C at 0–60 cm soils by 27 Mg ha −1 and 47 Mg ha −1, respectively. Furthermore, the effect of organic amendments on SIC content is more pronounced below the first 20 cm. Thus, the application of organic amendments is recommended as an appropriate measure to not only improve soil condition for plant growth and SOC accumulation but also to store C as SIC at deeper depths.

AB - Organic amendments are effective in promoting salt leaching, improving availability of nutrients and increasing crop yield in saline soils. However, the effects of the combined application of organic amendments on soil inorganic carbon (SIC) content and its driving mechanisms are unknown. We examined how changes in soil biochemical properties including moisture content, pH value, dissolved ions, soil organic C (SOC), dissolved organic C (DOC), microbial biomass C (MBC), and activities of C- and N-related enzyme due to applying (i) only mineral fertilizers (control; Ctrl) or mineral fertilization in combination with (ii) manure (M); (iii) biofertilizer plus manure (B+M); and (iv) humic acid plus manure (HA+M) modify SIC pool over three years. Organic amendments increased the content of Ca 2+ and HCO 3 – ions, but significantly decreased Na +, Cl −, and SO 4 2− at 0–60 cm soil layers compared to Ctrl. Furthermore, the activities of β-glucosidase (BG), Xylanase (BX), Cellobiosidase (CE), and β-1,4-N-Acetyl-glucosaminidase (NAG) increased at 0–40 cm soil. Partial least squares path model manifested that organic amendment directly accumulated SIC content by increasing Ca 2+ content and the activities of BX and NAG. Additionally, the decrease of Cl − contents under organic amendments favored the increase of MBC and SOC content, which further increased SIC content. Generally, the effects of HA+M were greater than other fertilization managements, which increased the stocks of SIC and total C at 0–60 cm soils by 27 Mg ha −1 and 47 Mg ha −1, respectively. Furthermore, the effect of organic amendments on SIC content is more pronounced below the first 20 cm. Thus, the application of organic amendments is recommended as an appropriate measure to not only improve soil condition for plant growth and SOC accumulation but also to store C as SIC at deeper depths.

KW - Carbon sequestration

KW - Humic acid plus manure

KW - Organic amendment

KW - Saline soils

KW - Soil inorganic carbon

UR - http://www.scopus.com/inward/record.url?scp=85190329131&partnerID=8YFLogxK

U2 - 10.1016/j.catena.2024.108039

DO - 10.1016/j.catena.2024.108039

M3 - Article

VL - 241

JO - CATENA

JF - CATENA

SN - 0341-8162

M1 - 108039

ER -