Li Jinsheng, Wei Juping, Shao Xinqing, Yan Xinhui, Liu Kesi
School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui, China.
College of Grassland Science and Technology, China Agricultural University, Beijing, China.
Front Microbiol. 2024 Jan 15;14:1330149. doi: 10.3389/fmicb.2023.1330149. eCollection 2023.
Soil beneficial microorganism deficiency in the degraded grasslands have emerged as the major factors negatively impacting soil quality and vegetation productivity. EM (effective microorganisms) has been regarded as a good ameliorant in improving microbial communities and restoring degraded soil of agricultural systems. However, knowledge was inadequate regarding the effects of adding EM on the degraded alpine grassland. Four levels of EM addition (0, 150, 200, 250 mL m) were conducted to investigate the effects of EM addition on soil properties and microorganisms of degraded alpine grassland. The addition of EM increased aboveground biomass, soil organic carbon, total nitrogen, available phosphorus, and microbial biomass, but decreased soil electric conductivity. Meanwhile, the relative biomasses of gram-negative bacteria decreased, while the ectomycorrhizal fungi and arbuscular mycorrhizal fungi increased after EM addition. The relationship between microbial communities and environmental factors has been changed. The restore effect of EM increased with the increase of addition time. These results indicated that EM addition could be a good practice to restore the health of the degraded alpine grassland ecosystem.
退化草原中土壤有益微生物的缺乏已成为对土壤质量和植被生产力产生负面影响的主要因素。有效微生物群（EM）被认为是改善农业系统微生物群落和恢复退化土壤的良好改良剂。然而，关于添加EM对退化高寒草原的影响，相关知识还很匮乏。进行了四个水平的EM添加量（0、150、200、250 mL/m²）试验，以研究添加EM对退化高寒草原土壤性质和微生物的影响。添加EM增加了地上生物量、土壤有机碳、全氮、有效磷和微生物生物量，但降低了土壤电导率。同时，添加EM后革兰氏阴性菌的相对生物量减少，而外生菌根真菌和丛枝菌根真菌增加。微生物群落与环境因素之间的关系发生了变化。EM的恢复效果随着添加时间的增加而增强。这些结果表明，添加EM可能是恢复退化高寒草原生态系统健康的一种良好措施。
