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Phosphorus occurs in diverse chemical forms, including monoester P, diester P, and phytate, which require enzymatic hydrolysis by phosphatase into inorganic P before assimilation by plants. The interactions between plant interspecific differences in organic P acquisition strategies via phosphatase activities with root morphological traits would lead to P resource partitioning, but they have not been rigorously evaluated. We measured the activities of three classes of phosphatases (phosphomonoesterase, PME; phosphodiesterase, PDE; and phytase, PhT), specific root length (SRL), root diameter, and root tissue density in mature tree species with different mycorrhizal associations (ectomycorrhizal [ECM] or arbuscular mycorrhizal [AM]) and different successional status (climax or pioneer species) in Sabah, Malaysia. We studied nitrogen (N)\u2010 and P\u2010fertilized plots to evaluate the acquisition strategies for organic P under P\u2010limited conditions 7\u00a0years after fertilization was initiated. P fertilization reduced the PME activity in all studied species and reduced PhT and PDE activities more in climax species than in the two pioneer species, irrespective of the mycorrhizal type. PDE activity increased in some climax species after N fertilization, suggesting that these species allocate excess N to the synthesis of PDE. Moreover, PME and PhT activities, but not PDE activity, correlated positively with SRL. We suggest that climax species tend to be more strongly dependent on recalcitrant organic P (i.e., phytate and\/or diester P) than pioneer species, regardless of the mycorrhizal type. We also suggest that trees in which root PME or PhT activity is enhanced can increase their SRL to acquire P efficiently. Resource partitioning of soil organic P would occur among species through differences in their phosphatase activities, which plays potentially ecologically important role in reducing the competition among coexisting tree species in lowland tropical rainforests.<\/jats:p>","DOI":"10.1002\/ece3.8669","type":"journal-article","created":{"date-parts":[[2022,3,8]],"date-time":"2022-03-08T04:35:08Z","timestamp":1646714108000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Interspecific differences in the responses of root phosphatase activities and morphology to nitrogen and phosphorus fertilization in Bornean tropical rain forests"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2372-0153","authenticated-orcid":false,"given":"Yu","family":"Hirano","sequence":"first","affiliation":[{"name":"Department of Forest Science Tokyo University of Agriculture  Setagaya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kanehiro","family":"Kitayama","sequence":"additional","affiliation":[{"name":"Graduate School of Agriculture Kyoto University  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8435-7693","authenticated-orcid":false,"given":"Nobuo","family":"Imai","sequence":"additional","affiliation":[{"name":"Department of Forest Science Tokyo University of Agriculture  Setagaya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,3,7]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0065\u20102504(08)60016\u20101"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/ecy.2110"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ece3.771"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1139\/b92\u2010101"},{"key":"e_1_2_10_6_1","first-page":"169","volume-title":"Mineral nutrients in tropical forest and savannah ecosystems","author":"Alexander I. 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