Effects of Earthworms and Phosphate-Solubilizing Bacteria on Carbon Sequestration in Soils Amended with Manure and Slurry: A 4-Year Field Study
Zhen Wang,
Yifang An,
Huayi Chen,
Jiaxin Zhang,
Haichun Zhang,
Genfa Zhu,
Jinfeng Chen,
Wenyan Li,
Jinjin Wang,
Hui-Juan Xu,
Yongtao Li,
Yulong Zhang
Affiliations
Zhen Wang
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Yifang An
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Huayi Chen
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Jiaxin Zhang
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Haichun Zhang
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Genfa Zhu
Guangdong Key Laboratory of Ornamental Plant Germplasm Innovation and Utilization, Environmental Horticulture Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Jinfeng Chen
Guangdong Key Laboratory of Ornamental Plant Germplasm Innovation and Utilization, Environmental Horticulture Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Wenyan Li
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Jinjin Wang
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Hui-Juan Xu
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Yongtao Li
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Yulong Zhang
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
The application of organisms as part of soil remediation can accelerate the decomposition of organic matter and the carbon cycle. To explore the synergistic effects of earthworms and phosphate-solubilizing bacteria on C accumulation in artificially improved soils of manure and in slurry-amended soil, a dry slope of land was established on the hillside of a large pig farm. Experiments involving six treatments were performed, including control (CK), pig manure (Pm), and pig manure + slurry (Pm + S) treatments, as well as manure + slurry + earthworms (Te), manure + slurry + phosphate-solubilizing bacteria (Tb), and manure + slurry + earthworms + bacteria (T(e + b)). Compared with the CK, both the Pm + S and T(e + b) treatments significantly increased the SOC content. In particular, the T(e + b) treatment increased the SOC by 196%. The synergistic effect of T(e + b) on the increase in organic carbon was consistent with the results of soil-carbon sequestration. After comprehensive fertilization, soil-carbon sequestration reached 2.87 Mg C hm−2, while stable organic carbon increased to 1.88 Mg C hm−2. It was also consistent with the result of PCA analysis in which applying earthworms promoted an increase in insoluble organic carbon. Therefore, in the future, earthworms and organic fertilizers can be applied to promote organic carbon sequestration on dry sloping land.
