Does anthropogenic phosphorus input reduce soil microbial resource allocation to acquire nitrogen relative to carbon?

Year 2019, Volume: 8 Issue: 1, 54 - 59, 01.01.2019

Taiki Mori Ryota Aoyagi

https://doi.org/10.18393/ejss.498039

Cited By: 2

Abstract

We
aimed to test if anthropogenic P input into ecosystems reduces microbial
resource allocation to acquire N (and alleviate N shortage if any) because
microbes no longer produce N-rich phosphatase for P acquisition. Literatures
reporting the effect of P fertilization on C-acquiring (β-1,4-glucosidase, BG)
and N-acquiring (β-1,4-N-acetylglucosaminidase, NAG, which also acquires C)
enzymes were collected and synthesized. We predicted that P addition elevates
BG:NAG especially in P-poor ecosystems because P addition alleviates N shortage
and reduces the microbial resource allocation to acquire N relative to C. The
synthesized data demonstrated that P fertilization occasionally reduced BG:NAG,
which is inconsistent with the prediction. However, this might not mean that
the initial hypothesis was rejected. Stimulated microbial activity and turnover
by P fertilization could have caused microbes depend the C sources more on
chitin (and peptidoglycan) compared with on cellulose because chitin (and
peptidoglycan) is a main component of microbial body and re-provided through
microbial turnover. The changes in C resources accompanied by the altered P
availability may have largely influenced BG:NAG, masking the role of BG:NAG for
indicating microbial resource allocation to C and N acquisitions.

Keywords

β-1, 4-glucosidase (BG), 4-N-acetylglucosaminidase (NAG), ecoenzymatic stoichiometry, phosphatase, phosphorus fertilization

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