Effect of long-term fertilization of nitrogen, phosphorus and organic fertilizer on PLFA in Chinese arable mollisol
Surface soil samples of 8 different fertilization treatments, including CK, N, P, NP, MCK, MN, MP, MNP in Gongzhuling national long-term experimental site, were taken on May 31, 2006. PLFA and the contents of organic carbon, total nitrogen, alkali-hydrolysable nitrogen (AN), available phosphorus (AP...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2008-01-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2008.01.011 |
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| Summary: | Surface soil samples of 8 different fertilization treatments, including CK, N, P, NP, MCK, MN, MP, MNP in Gongzhuling national long-term experimental site, were taken on May 31, 2006. PLFA and the contents of organic carbon, total nitrogen, alkali-hydrolysable nitrogen (AN), available phosphorus (AP), readily available potassium (RAK), NO<sub>3</sub><sup>-</sup>-N and NH<sub>4</sub><sup>+</sup>-N as well as soil pH of each sample were measured. The results show that organic fertilizer amendments (MCK, MN, MP and MNP) and application of single P significantly promoted soil microbial growth and increased the fungi-to-bacteria ratio. Long-term application of single N did not affect bacterial or fungal growth. In comparison with MCK, the combined application of chemical and organic fertilizers had different effects on fungi and bacteria: as for total bacterial PLFA, the order was MCK (54.7 nmol·g<sup>-1</sup>) >MP (49.7 nmol·g<sup>-1</sup>) > MN (44.8 nmol·g<sup>-1</sup>) > MNP (42.6 nmol·g<sup>-1</sup>); however, fungi were significantly promoted by the addition of chemical fertilizers with the order of MP (28.5 nmol·g<sup>-1</sup>) > MN (26.0 nmol·g<sup>-1</sup>) >MNP (22.8 nmol. g<sup>-1</sup>) >MCK (22.0 nmol·g<sup>-1</sup>). Multivariate regression analysis suggested that total microbial and bacterial biomass were significantly affected by readily available potassium and NO<sub>3</sub><sup>-</sup>-N, and fungal biomass was influenced by available phosphorus and NH<sub>4</sub><sup>+</sup>-N. NO<sub>3</sub><sup>-</sup>-N and total nitrogen were the most important factors affecting the growth of G<sup>+</sup>, while the most important factor for G<sup>-</sup> was readily available potassium. |
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| ISSN: | 1008-9209 2097-5155 |