Effects of long-term phosphorus addition on soil ratios of phosphomonoesterase to phosphodiesterase in three tropical forests

TY - JOUR

T1 - Effects of long-term phosphorus addition on soil ratios of phosphomonoesterase to phosphodiesterase in three tropical forests

AU - Mori, Taiki

AU - Wang, Senhao

AU - Wang, Cong

AU - Chen, Ji

AU - Peng, Cheng

AU - Zheng, Mianhai

AU - Huang, Juan

AU - Wang, Faming

AU - Liu, Zhanfeng

AU - Mo, Jiangming

AU - Zhang, Wei

PY - 2023/6

Y1 - 2023/6

N2 - Soil microorganisms in tropical forests can adapt to phosphorus (P)-poor conditions by changing the activity ratios of different types of phosphatases. We tested whether microorganisms in P-poor tropical forest soils increased the phosphomonoesterase (PME) to phosphodiesterase (PDE) activity ratio, because a one-step enzymatic reaction of monoester P degradation might be more adaptive for microbial P acquisition than a two-step reaction of diester P degradation. A continuous 10-year P addition experiment was performed in three tropical forests. The activities of PME and PDE, and their ratio in soil, were determined under the hypothesis that the P-fertilized plots where P shortage is relieved would have lower PME:PDE ratios than the unfertilized controls. We demonstrated that long-term P addition in tropical forest soil did not alter the PME:PDE ratio in primary and secondary forests, whereas P fertilization elevated the PME:PDE ratio in planted forest. These results were in contrast to previous results. The long-term, large-scale P fertilization in our study may have reduced litter- and/or throughfall-derived PDE, which negated the lowered PME:PDE ratio via exogenous P inputs.

AB - Soil microorganisms in tropical forests can adapt to phosphorus (P)-poor conditions by changing the activity ratios of different types of phosphatases. We tested whether microorganisms in P-poor tropical forest soils increased the phosphomonoesterase (PME) to phosphodiesterase (PDE) activity ratio, because a one-step enzymatic reaction of monoester P degradation might be more adaptive for microbial P acquisition than a two-step reaction of diester P degradation. A continuous 10-year P addition experiment was performed in three tropical forests. The activities of PME and PDE, and their ratio in soil, were determined under the hypothesis that the P-fertilized plots where P shortage is relieved would have lower PME:PDE ratios than the unfertilized controls. We demonstrated that long-term P addition in tropical forest soil did not alter the PME:PDE ratio in primary and secondary forests, whereas P fertilization elevated the PME:PDE ratio in planted forest. These results were in contrast to previous results. The long-term, large-scale P fertilization in our study may have reduced litter- and/or throughfall-derived PDE, which negated the lowered PME:PDE ratio via exogenous P inputs.

KW - phosphodiesterase

KW - phosphomonoestarase

KW - phosphorus fertilization

KW - soil extracellular enzymes

KW - tropical forest

UR - http://www.scopus.com/inward/record.url?scp=85152535084&partnerID=8YFLogxK

U2 - 10.1093/jpe/rtac091

DO - 10.1093/jpe/rtac091

M3 - Journal article

AN - SCOPUS:85152535084

SN - 1752-9921

VL - 16

JO - Journal of Plant Ecology

JF - Journal of Plant Ecology

IS - 3

M1 - rtac091

ER -