CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (CAS), Yantai, 264003, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Bull Environ Contam Toxicol. 2022 Aug;109(2):304-309. doi: 10.1007/s00128-022-03519-1. Epub 2022 Jun 3.
Long-term pig manure addition has been widely applied in red soil to improve soil fertility. However, the influence of combined utilization of pig manure and effective microbes (EM) on soil organic carbon (SOC) and Cd are not well understood. This study conducted a 23-year (1996-2019) long-term fertilization field trial to investigate the changes of different fractions of SOC and Cd under chemical fertilization (CF), pig manure (PM), and pig manure with effective microbes (PM + EM) treatments in an agricultural soil of Jiangxi Province, South China. The results showed that the pig manure addition significantly enhanced the contents of SOC and Cd in the soils compared with the CF treatments. Furthermore, with the increment of SOC, the PM + EM treatment significantly increased the contents of soil microbial biomass carbon, dissolved organic carbon and easily oxidizable carbon compared with the pig manure application alone. Meanwhile, compared with the CF treatments, the EM addition significantly enhanced the exchangeable and oxidizable fractions of Cd, thus the potential Cd environment risk due to pig manure application should be carefully assessed.
长期施用猪粪已广泛应用于红壤以提高土壤肥力。然而，猪粪与有效微生物（EM）联合利用对土壤有机碳（SOC）和 Cd 的影响尚不清楚。本研究通过 23 年（1996-2019 年）的长期施肥田间试验，研究了江西省农业土壤中化肥（CF）、猪粪（PM）和添加有效微生物的猪粪（PM+EM）处理下不同 SOC 和 Cd 形态的变化。结果表明，与 CF 处理相比，猪粪的添加显著提高了土壤中 SOC 和 Cd 的含量。此外，随着 SOC 的增加，PM+EM 处理与单独施用猪粪相比，显著增加了土壤微生物生物量碳、溶解性有机碳和易氧化碳的含量。同时，与 CF 处理相比，EM 的添加显著增加了 Cd 的可交换态和可氧化态，因此应谨慎评估猪粪施用引起的 Cd 潜在环境风险。
