文献类型： 外文期刊

作者： Chen, Mengmeng ¹ ; Kuzyakov, Yakov ² ; Zhou, Jie ³ ; Zamanian, Kazem ⁴ ; Wang, Shang ⁵ ; Abdalla, Khatab ⁶ ; Wang, Jing ¹ ; Li, Xiaobin ¹ ; Li, Haoruo ¹ ; Zhang, Hongyuan ¹ ; Mganga, Kevin Z. ⁸ ; Li, Yuyi ¹ ; Blagodatskaya, Evgenia ⁹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arable Land China, Beijing 100081, Peoples R China

2.Georg August Univ Gottingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, Gottingen, Germany

3.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China

4.Leibniz Univ Hannover, Inst Earth Syst Sci, Sect Soil Sci, D-30419 Hannover, Germany

5.Christian Albrechts Univ Kiel, Inst Phytopathol, Dept Soil & Plant Microbiome, D-24118 Kiel, Germany

6.Univ Bayreuth, Bayreuth Ctr Ecol & Environm Res, Agroecol, Bayreuth, Germany

7.Natl Ctr Res, Environm Nat Resources & Desertificat Res Inst, Khartoum, Sudan

8.Univ Utrecht, Copernicus Inst Sustainable Dev, Utrecht, Netherlands

9.UFZ Helmholtz Ctr Environm Res, Dept Soil Ecol, Halle, Germany

关键词： Saline soil; Priming effect; Straw decomposition; Microbial life strategy; Carbon dynamic

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：10.3； 五年影响因子：11.5 ）

ISSN： 0038-0717

年卷期： 2025 年 207 卷

页码：

收录情况： SCI

摘要： Straw incorporation is a widely recommended agronomic practice to increase organic carbon (C) in saline soil. The mechanism of straw induced priming effect (PE) on soil organic matter (SOM) decomposition is likely to be influenced by salinity, which may stimulate microbial processes and enzyme activity because of osmotic stress and nutrient resource limitation. We incubated 13C-labeled straw in soil for 90 d under three salinity levels: low electrical conductivity (EC1:5) of 0.31 dS m1, medium EC1:5 of 0.97 dS m-1, and high EC1:5 of 1.6 dS m-1). During the first 15 d, the low salinity soil had 31 % greater PE than the high salinity soil, apparently due to microbial preference for labile straw-derived C over SOM under negligible osmotic stress. This trend was reversed from day 30 onward, with medium-and high-salinity soil showing amplified PE (1.1-fold and 1.7-fold increase respectively versus low-salinity control), associated with microbial N limitation (inorganic N dropped more than 16 %) and dominance of copiotrophic taxa: Proteobacteria, Bacteroidota, Ascomycota. High salinity decreased microbial biomass and diversity, and slowed down straw decomposition, which lowered necromass by 13 % and increased plant-derived C by 6.9 % compared to low soil salinity. Quantitative modeling demonstrated linear salinity effects on C cycling-each 1 dS m1 increase in soil EC1:5 amplified the annual PE by 930 mg C kg-1 soil year-1 and reduced the net C balance by 3.8 g C kg-1 soil. Therefore, high soil salinity enhances SOM loss, while increase in straw-derived C primarily comes from plant-derived C rather necromass C. Our findings make the connection between soil salinity and C dynamics in straw-remediated saline soil, which is linked to the C sequestration potential of saline lands.