at Google ScholarTitle data
Kumar, Amit ; Pausch, Johanna:
Microbial nutrient limitation and catalytic adjustments revealed from a long‐term nutrient restriction experiment.
In: Journal of Sustainable Agriculture and Environment.
Vol. 1
(2022)
Issue 2
.
- pp. 142-148.
ISSN 2767-035X
DOI: https://doi.org/10.1002/sae2.12015
Abstract in another language
Introduction
Microbial abundance and activities in soils are predominantly determined by soil carbon (C), nitrogen (N) and phosphorus (P) availability. Much research has focused on the effects of soil N than P availability on soil microbial biomass and enzyme activities as sensitive proxies of microbial ecophysiology highlighting the need to investigate how microbes will respond to P availability in soil, especially in cropping systems.
Materials and Methods
The effect of P fertilisation on microbial biomass-C, -N and -P, and the kinetic parameters (maximal velocity [Vmax], Michaelis constant [Km] and catalytic efficiency [Ka]) of β-1,4-glucosidase (BG; C-acquiring), leucine-aminopeptidase (LAP; predominantly N-acquiring) and acid phosphomonoesterase (PHO; P-acquiring) were measured in a nutrient-poor agricultural soil (devoid of fertiliser application since 1942).
Results
This study showed that P fertilisation led to a 65% and 56% increase in microbial biomass-N and -P, respectively, indicating severe P limitation and inefficient N acquisition by microbes without P availability. Increased Ka values of LAP with P fertilisation further hint toward the production of efficient isoenzymes to avoid resource tradeoffs for nutrient acquisition.
Conclusions
Overall, these results decipher microbial metabolic and catalytic adjustments mediated by soil P availability. Increased microbial biomass-N and -P with P fertilisation indicated microbial N and P colimitation that was partly overcome by the production of efficient enzymes for N acquisition with P fertilisation. We argue to incorporate microbial enzyme activities as a response to different management strategies to better inform us about soil biogeochemical cycles in cropping systems.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Agroecology > Professor Agroecology - Juniorprof. Dr. Johanna Pausch |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science > 500 Natural sciences 500 Science > 550 Earth sciences, geology 500 Science > 570 Life sciences, biology |
| Date Deposited: | 17 Oct 2023 07:25 |
| Last Modified: | 17 Oct 2023 07:25 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/87239 |