@Article{SantosTngApgAssMan:2022:SoPhFr,
               author = "Santos, Emily Darc Andrade dos and Tng, David Yue Phin and Apgaua, 
                         Deborah Mattos Guimar{\~a}es and Assun{\c{c}}{\~a}o, Raul Reis 
                         and Manzi, Antonio Ocimar",
          affiliation = "{Instituto Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and 
                         {Centre for Rainforest Studies} and {Centre for Rainforest 
                         Studies} and {Universidade Federal de Lavras (UFLA)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Soil phosphorus fractions and their relation to leaf litterfall in 
                         a central Amazonian terra firme rainforest",
              journal = "Acta Amazonica",
                 year = "2022",
               volume = "52",
               number = "2",
                pages = "104--113",
             keywords = "leaf litter, nutrient cycling, tropical soil.",
             abstract = "Phosphorus (P) cycling is an important yet poorly studied aspect 
                         of the macronutrient balance in tropical rainforest ecosystems. As 
                         soil P occurs in different organic and inorganic forms (fractions) 
                         with varying degrees of lability, we hypothesized that these 
                         fractions will vary between soil types, and temporally within soil 
                         types. Additionally, we hypothesized a direct influence of leaf 
                         litterfall P input on soil total P and soil P fractions. We 
                         collected soil and leaf litter samples from three soil types in a 
                         central Amazonian lowland rainforest in Brazil over five months, 
                         and used a modified Hedleys fractionation method to determine six 
                         organic and inorganic soil P fractions, and also total, labile and 
                         residual P. Leaf litterfall P concentrations were determined 
                         colorimetrically. Soil inorganic and organic P fractions varied 
                         between soil types and across months, but soil type and month 
                         interactions were mostly non-significant. Some inorganic P 
                         fractions (Pi-NaOH) peaked while the organic fractions (Po-NaOH) 
                         fell and vice versa. Leaf litterfall production and leaf 
                         litterfall P input peaked around two months following the wettest 
                         month. Leaf litterfall P input was a significant predictor of 
                         Po-NaHCO3, a bioavailable P fraction. Future studies on P cycling 
                         in terrestrial ecosystems should examine the roles played by 
                         individual soil P fractions as they cycle asynchronistically and 
                         differently across soil types.",
                  doi = "10.1590/1809-4392202103471",
                  url = "http://dx.doi.org/10.1590/1809-4392202103471",
                 issn = "0044-5967",
             language = "en",
           targetfile = "download.pdf",
        urlaccessdate = "23 maio 2024"
}