Fine roots stimulate nutrient release during early stages of leaf litter decomposition in a Central Amazon rainforest

17461 7 95411 3 293897 document 95411 Martins2021_Article_FineRootsStimulateNutrientRele.pdf application/pdf 37fedde820a16784373c32bc7bfc4779 MD5 2138547 2021-10-04 11:39:46 https://pure.iiasa.ac.at/id/eprint/17461/1/Martins2021_Article_FineRootsStimulateNutrientRele.pdf 17461 1 1 application/pdf text en public cc_by_4

Martins2021_Article_FineRootsStimulateNutrientRele.pdf

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/95411 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/95411 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/95411 archive 2 disk0/00/01/74/61 2021-10-04 11:42:59 2022-03-14 14:13:25 2021-10-04 11:42:59 article show Martins N.P. Fuchslueger L. Fleischer K. Andersen K.M. Assis R.L. Baccaro F. B. Camargo P.B. Cordeiro A.L. Grandis A. Hartley I. P. Hofhansl F. 2222 0000-0003-0073-0946 Lugli L.F. Lapola D.M. Menezes J.G. Norby R.J.. Rammig A. Rosa J.S. Schaap K.J. Takeshi B. Valverde-Barrantes O.J. Quesada C. A. Fine roots stimulate nutrient release during early stages of leaf litter decomposition in a Central Amazon rainforest pub BNR AFE BEC Purpose Large parts of the Amazon rainforest grow on weathered soils depleted in phosphorus and rock-derived cations. We tested the hypothesis that in this ecosystem, fine roots stimulate decomposition and nutrient release from leaf litter biochemically by releasing enzymes, and by exuding labile carbon stimulating microbial decomposers. Methods We monitored leaf litter decomposition in a Central Amazon tropical rainforest, where fine roots were either present or excluded, over 188 days and added labile carbon substrates (glucose and citric acid) in a fully factorial design. We tracked litter mass loss, remaining carbon, nitrogen, phosphorus and cation concentrations, extracellular enzyme activity and microbial carbon and nutrient concentrations. Results Fine root presence did not affect litter mass loss but significantly increased the loss of phosphorus and cations from leaf litter. In the presence of fine roots, acid phosphatase activity was 43.2% higher, while neither microbial stoichiometry, nor extracellular enzyme activities targeting carbon- and nitrogen-containing compounds changed. Glucose additions increased phosphorus loss from litter when fine roots were present, and enhanced phosphatase activity in root exclusions. Citric acid additions reduced litter mass loss, microbial biomass nitrogen and phosphorus, regardless of fine root presence or exclusion. Conclusions We conclude that plant roots release significant amounts of acid phosphatases into the litter layer and mobilize phosphorus without affecting litter mass loss. Our results further indicate that added labile carbon inputs (i.e. glucose) can stimulate acid phosphatase production by microbial decomposers, highlighting the potential importance of plant-microbial feedbacks in tropical forest ecosystems. 2021-10-02 10.1007/s11104-021-05148-9 3022 public Plant and Soil 469 287-303 TRUE 0032-079X info:eu-repo/semantics/article