Journal
APPLIED SOIL ECOLOGY
Volume 51, Issue -, Pages 1-8Publisher
ELSEVIER
DOI: 10.1016/j.apsoil.2011.08.004
Keywords
Earthworm; Metaphire guillelmi; Humus composition; Humic acid; C-13 CPMAS NMR; Maize residue
Categories
Funding
- National Natural Science Foundation of China [41171206]
- National Basic Research Program of China [2009CB118600]
- Northeast Agricultural Research Centre of China [00225]
- Postdoctoral Project of Jilin Province [01912]
- Ministry of Education of China
Ask authors/readers for more resources
The effect of earthworms on humus composition and humic acid (HA) characteristics was studied in a rice-wheat rotation agroecosystem. Experimental plots in the rotation had five treatments, i.e., incorporation or mulching of maize residues with or without added earthworms and a control. Compared with the control, the application of maize residues to soil either alone or in combinations with earthworms strongly affected the humus composition and HA characteristics. In the presence of earthworms, the carbon ratio of HA to fulvic acid (FA), and the alkyl C/O-alkyl C and hydrophobic C/hydrophilic C ratios of HA were slightly higher, while the aliphatic C/aromatic C ratio of HA was slightly lower following maize residue incorporation than the same treatment without earthworms. In contrast, these ratios generally remained almost constant following maize residue mulching. Thus, earthworm activity following maize residue incorporation was more favorable for the HA formation, and was associated with a decrease in aliphaticity of HA, and an increase in its degree of humification and hydrophobicity. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available