Dynamics of sediment-associated nitrogen export from intermittent streams in subtropical forests of southeast China.

Autor: Yang Q; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China., Wu F; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, 365002, China., Peñuelas J; CREAF, E08193, Cerdanyola del Vallès, Catalonia, Spain; CSIC, Global Ecology Unit, CREAF-CSIC-UAB, E08193, Cerdanyola del Vallès, Catalonia, Spain., Sardans J; CREAF, E08193, Cerdanyola del Vallès, Catalonia, Spain; CSIC, Global Ecology Unit, CREAF-CSIC-UAB, E08193, Cerdanyola del Vallès, Catalonia, Spain., Peng Y; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, 365002, China., Wu Q; State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, 311300, China., Li Z; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, Shaanxi 710061, China., Heděnec P; Institute of Tropical Biodiversity and Sustainable Development, University Malaysia Terengganu, 21030, Kuala Nerus, Terengganu, Malaysia., Yu J; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China., Yuan J; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China., Yuan C; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China., Ni X; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, 365002, China., Yue K; Key Laboratory of Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, 365002, China. Electronic address: kyleyuechina@163.com.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Dec 01; Vol. 262 (Pt 2), pp. 119963. Date of Electronic Publication: 2024 Sep 07.
DOI: 10.1016/j.envres.2024.119963
Abstrakt: The significance of intermittent streams in nutrient loss within forest ecosystems is becoming increasingly critical due to changes in precipitation patterns associated with global climate change. However, few studies have focused on nutrient export from intermittent streams. We conducted continuous sediment collection from intermittent streams from March 2022 to February 2023 to investigate the export pattern and mechanism of sediment-associated nitrogen (N) from intermittent streams of different forest types (composed forest of Castanopsis carlesii (Cas. carlesii) and Cunninghamia lanceolata (C. lanceolata) forests, compared to Cas. carlesii forests). We measured the N concentrations and calculated the export amounts of four common forms of N associated with sediments: total N (TN), dissolved N (DN), nitrate, and ammonia. Our results showed that (1) the annual average exports of TN, DN, nitrate, and ammonia associated with sediments from intermittent streams from both forest types were 273, 1.62, 0.26, and 0.84 kg ha -1 , respectively; (2) N export was significantly higher in composite forests of Cas. carlesii and C. lanceolata, compared to Cas. carlesii forests; (3) stream sediment export amount positively affected N export both in composite forests and Cas. carlesii forests; and (4) N export was also controlled by rainfall amount and stream characteristics. Our study quantified sediment-associated N export from intermittent streams among different subtropical forest types, which will enhance our understanding of N dynamics associated with stream hydrological processes in subtropical forests.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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