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240126s2024 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.17077
|2 doi
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|a eng
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| 100 |
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|a Xu, Suwei
|e verfasserin
|4 aut
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| 245 |
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|a Soil phosphorus cycling across a 100-year deforestation chronosequence in the Amazon rainforest
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 29.01.2024
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|a Date Revised 29.01.2024
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|a published: Print
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|a Citation Status MEDLINE
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|a © 2023 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
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|a Deforestation of tropical rainforests is a major land use change that alters terrestrial biogeochemical cycling at local to global scales. Deforestation and subsequent reforestation are likely to impact soil phosphorus (P) cycling, which in P-limited ecosystems such as the Amazon basin has implications for long-term productivity. We used a 100-year replicated observational chronosequence of primary forest conversion to pasture, as well as a 13-year-old secondary forest, to test land use change and duration effects on soil P dynamics in the Amazon basin. By combining sequential extraction and P K-edge X-ray absorption near edge structure (XANES) spectroscopy with soil phosphatase activity assays, we assessed pools and process rates of P cycling in surface soils (0-10 cm depth). Deforestation caused increases in total P (135-398 mg kg-1 ), total organic P (Po ) (19-168 mg kg-1 ), and total inorganic P (Pi ) (30-113 mg kg-1 ) fractions in surface soils with pasture age, with concomitant increases in Pi fractions corroborated by sequential fractionation and XANES spectroscopy. Soil non-labile Po (10-148 mg kg-1 ) increased disproportionately compared to labile Po (from 4-5 to 7-13 mg kg-1 ). Soil phosphomonoesterase and phosphodiesterase binding affinity (Km ) decreased while the specificity constant (Ka ) increased by 83%-159% in 39-100y pastures. Soil P pools and process rates reverted to magnitudes similar to primary forests within 13 years of pasture abandonment. However, the relatively short but representative pre-abandonment pasture duration of our secondary forest may not have entailed significant deforestation effects on soil P cycling, highlighting the need to consider both pasture duration and reforestation age in evaluations of Amazon land use legacies. Although the space-for-time substitution design can entail variation in the initial soil P pools due to atmospheric P deposition, soil properties, and/or primary forest growth, the trend of P pools and process rates with pasture age still provides valuable insights
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|a Journal Article
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|a Amazon
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|a XANES
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|a chronosequence
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|a deforestation
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|a phosphatase
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|a phosphorus
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| 650 |
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|a phosphorus fractionation
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| 650 |
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|a reforestation
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| 650 |
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|a Soil
|2 NLM
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| 650 |
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|a Phosphorus
|2 NLM
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| 650 |
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|a 27YLU75U4W
|2 NLM
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| 700 |
1 |
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|a Gu, Chunhao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Rodrigues, Jorge L M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Li, Chongyang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bohannan, Brendan
|e verfasserin
|4 aut
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| 700 |
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|a Nüsslein, Klaus
|e verfasserin
|4 aut
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|a Margenot, Andrew J
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 30(2024), 1 vom: 04. Jan., Seite e17077
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
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|g volume:30
|g year:2024
|g number:1
|g day:04
|g month:01
|g pages:e17077
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|u http://dx.doi.org/10.1111/gcb.17077
|3 Volltext
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