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

Authors : Taiki MORİ, Ryota AOYAGİ

Pages : 54-59

Doi:10.18393/ejss.498039

View : 42 | Download : 8

Publication Date : 2019-01-01

Article Type : Research Paper

Abstract :We aimed to test if anthropogenic P input into ecosystems reduces microbial resource allocation to acquire N insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(β-1,4-glucosidase, BG); and N-acquiring insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(and peptidoglycan); compared with on cellulose because chitin insert ignore into journalissuearticles values(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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