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Biochar addition affects root morphology and nitrogen uptake capacity in common reed (Phragmites australis).
Li, Qian-Wei; Liang, Jin-Feng; Zhang, Xiao-Ya; Feng, Jiu-Ge; Song, Ming-Hua; Gao, Jun-Qin.
Affiliation
  • Li QW; School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China.
  • Liang JF; School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
  • Zhang XY; School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China.
  • Feng JG; School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China.
  • Song MH; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, A11, Datun Road, Chaoyang District, Beijing 100101, China.
  • Gao JQ; School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China; The Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration, China. Electronic address: gaojq@bjfu.edu.cn.
Sci Total Environ ; 766: 144381, 2021 Apr 20.
Article de En | MEDLINE | ID: mdl-33418260
ABSTRACT
Nitrogen (N) is a key factor that limits plant growth in most terrestrial ecosystems, and biochar reportedly improves soil characteristics and grain yields. However, the effects of biochar on plant N uptake in wetland ecosystems and the underlying mechanisms of these effects remain unclear. Therefore, our study sought to characterise the effects of biochar addition on Phragmites australis N absorption rates at two different N deposition conditions [30 and 60 kg N hm-2 yr-1; i.e., "low" and "high" N treatments, respectively]. Our results demonstrated that biochar significantly promoted root biomass growth in P. australis in the high N treatment group. In contrast, the low N treatment group exhibited an increased proportion of fine roots and a decrease in the average P. australis root diameter. The N absorption rate of P. australis in the low N treatment group significantly increased with biochar addition and ammonium N became the preferred N source. The absorption rates of both ammonium and nitrate N were negatively correlated with the average P. australis root diameter. Therefore, our findings indicate that biochar may affect the N uptake strategy of P. australis by altering root morphogenesis, thereby providing new insights into potential restoration strategies for wetland vegetation.
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Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Sujet principal: Écosystème / Azote Langue: En Journal: Sci Total Environ Année: 2021 Type de document: Article Pays d'affiliation: Chine

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Sujet principal: Écosystème / Azote Langue: En Journal: Sci Total Environ Année: 2021 Type de document: Article Pays d'affiliation: Chine