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<p>Nutrient cycling is critical for maintaining ecosystem functions across diverse vegetation types worldwide. Understanding this process is particularly crucial for the conservation of the distinct physiognomies and species of threatened biomes. Here, we assessed how the phytomass (woody aboveground biomass, fine root biomass and litter production) and different carbon (total), phosphorus (total), nitrogen (total, microbial biomass nitrogen [MBN], dissolved organic nitrogen [DON], NH<sub>4</sub>-N and NO<sub>3</sub>-N) pools vary among three main Cerrado physiognomies (woodland savanna – WS, intermediate savanna – IS, and open savanna – OS). In general, total soil carbon, nitrogen (total N, NO<sub>3</sub>-N, NH<sub>4</sub>-N and DON), and phosphorus (total P) were higher in the woodland savanna than in the open savanna, with intermediate savanna typically showing intermediate values. Soil MBN was higher in the intermediate savanna than in the woodland savanna and the open savanna (WS = 288.99 ± 24.52; IS = 484.86 ± 49.24; OS = 278.14 ± 40.15; <i>p</i> = 0.005). Phytomass (specifically, tree biomass and litter production) was directly related to soil total N, NH<sub>4</sub>-N, DON and P. Also, MBN pools and the fine root biomass were higher in the intermediate savanna, likely due to greater arboreal diversity in this physiognomy. Further, the studied physiognomies formed a phytomass gradient that positively correlated with soil carbon pools. Our findings indicate that the variations in soil N and P content regulate the Cerrado productivity and consequently influence soil C pools. These results underscore the critical role of nutrient dynamics in shaping vegetation structure and ecosystem functioning in the Brazilian savanna.</p>

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Different physiognomies of the Brazilian savanna determine changes in soil C, N and P pools

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Fernando da Costa Brito Lacerda,
  • Nayara Mesquita Mota,
  • Alex Josélio Pires Coelho,
  • Tâmara Thaiz Santana Lima,
  • Jorge Durán,
  • Alexandra Rodríguez,
  • João Augusto Alves Meira-Neto

摘要

Nutrient cycling is critical for maintaining ecosystem functions across diverse vegetation types worldwide. Understanding this process is particularly crucial for the conservation of the distinct physiognomies and species of threatened biomes. Here, we assessed how the phytomass (woody aboveground biomass, fine root biomass and litter production) and different carbon (total), phosphorus (total), nitrogen (total, microbial biomass nitrogen [MBN], dissolved organic nitrogen [DON], NH4-N and NO3-N) pools vary among three main Cerrado physiognomies (woodland savanna – WS, intermediate savanna – IS, and open savanna – OS). In general, total soil carbon, nitrogen (total N, NO3-N, NH4-N and DON), and phosphorus (total P) were higher in the woodland savanna than in the open savanna, with intermediate savanna typically showing intermediate values. Soil MBN was higher in the intermediate savanna than in the woodland savanna and the open savanna (WS = 288.99 ± 24.52; IS = 484.86 ± 49.24; OS = 278.14 ± 40.15; p = 0.005). Phytomass (specifically, tree biomass and litter production) was directly related to soil total N, NH4-N, DON and P. Also, MBN pools and the fine root biomass were higher in the intermediate savanna, likely due to greater arboreal diversity in this physiognomy. Further, the studied physiognomies formed a phytomass gradient that positively correlated with soil carbon pools. Our findings indicate that the variations in soil N and P content regulate the Cerrado productivity and consequently influence soil C pools. These results underscore the critical role of nutrient dynamics in shaping vegetation structure and ecosystem functioning in the Brazilian savanna.