Fine-root dynamics vary with soil depth and precipitation in a low-nutrient tropical forest in the Central Amazonia.

Autor: Cordeiro AL; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil.; Colorado State University - CSU Fort Collins CO USA., Norby RJ; Oak Ridge National Laboratory Oak Ridge TN USA., Andersen KM; Nanyang Technological University - NTU Singapore., Valverde-Barrantes O; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil.; Florida International University -Miami Miami FL USA., Fuchslueger L; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil.; University of Antwerp Antwerp Belgium., Oblitas E; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil., Hartley IP; Geography College of Life and Environmental Sciences University of Exeter Exeter UK., Iversen CM; Oak Ridge National Laboratory Oak Ridge TN USA., Gonçalves NB; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil.; Michigan State University - MSU East Lansing MI USA., Takeshi B; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil., Lapola DM; University of Campinas - UNICAMP Campinas Brazil., Quesada CA; Instituto Nacional de Pesquisas da Amazônia - INPA Manaus Brazil.
Jazyk: angličtina
Zdroj: Plant-environment interactions (Hoboken, N.J.) [Plant Environ Interact] 2020 Apr 22; Vol. 1 (1), pp. 3-16. Date of Electronic Publication: 2020 Apr 22 (Print Publication: 2020).
DOI: 10.1002/pei3.10010
Abstrakt: A common assumption in tropical ecology is that root systems respond rapidly to climatic cues but that most of that response is limited to the uppermost layer of the soil, with relatively limited changes in deeper layers. However, this assumption has not been tested directly, preventing models from accurately predicting the response of tropical forests to environmental change.We measured seasonal dynamics of fine roots in an upper-slope plateau in Central Amazonia mature forest using minirhizotrons to 90 cm depth, which were calibrated with fine roots extracted from soil cores.Root productivity and mortality in surface soil layers were positively correlated with precipitation, whereas root standing length was greater during the dry periods at the deeper layers. Contrary to historical assumptions, a large fraction of fine-root standing biomass (46%) and productivity (41%) was found in soil layers deeper than 30 cm. Furthermore, root turnover decreased linearly with soil depth.Our findings demonstrate a relationship between fine-root dynamics and precipitation regimes in Central Amazonia. Our results also emphasize the importance of deeper roots for accurate estimates of primary productivity and the interaction between roots and carbon, water, and nutrients.
Competing Interests: The authors declare no conflict of interest. [Correction added on 24 May 2021, after first online publication: Conflict of Interest statement added to provide full transparency.]
(© 2020 The Authors. Journal of Plant‐Environment Interactions Published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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