Diel patterns of fine root respiration in a dryland shrub, measured in situ over different phenological stages

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• 作者：Zongrui Lai ; Su Lu ; Yuqing Zhang ; Bin Wu ; Shugao Qin…
• 关键词：Caragana microphylla ; Phenology ; Photosynthesis ; Seasonal pattern ; Time lag
• 刊名：Journal of Forest Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：21
• 期：1
• 页码：31-42
• 全文大小：1,020 KB
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• 作者单位：Zongrui Lai (1) (2)
  Su Lu (1)
  Yuqing Zhang (1) (2)
  Bin Wu (1) (2)
  Shugao Qin (1)
  Wei Feng (1)
  Jiabin Liu (3)
  Keyu Fa (1)
  
  1. Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China
  2. Key Laboratory of Soil and Water Conservation and Desertification Combating, Beijing Forestry University, Ministry of Education, Beijing, 100083, China
  3. School of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, 712100, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Forestry
  Forestry Management
  Tree Biology
  Plant Sciences
  Plant Ecology
  
• 出版者：Springer Japan
• ISSN：1610-7403

文摘

Fine root (<2 mm) respiration (R _fr) may play an important role in carbon cycles in drylands; thus R _fr in desert ecosystems may have important implications for belowground processes and global carbon cycles. This study aimed to (1) investigate the diel and seasonal changes in R _fr of a shrub (Caragana microphylla Lam.) in situ during the growing season and to (2) detect the relationship between both photosynthesis and phenology and R _fr. The study was conducted in an even-aged C. microphylla plantation in a semiarid area in the Mu Us Desert of China. Rates of R _fr and net photosynthesis were measured using a standard chamber equipped with a portable gas analysis system. The data revealed two diel patterns that varied with different phenological stages. Diurnal R _fr rates were 2.2-fold greater than nocturnal R _fr rates. Our results showed that diurnal changes in R _fr strongly correlated with rates of net photosynthesis, suggesting that the diel changes were strongly associated with the current supply of photosynthates. Furthermore, aboveground phenology could partially explain some of the variations in seasonal R _fr. Our results provide basic information on the link between R _fr and aboveground activities, and enhance our understanding of carbon processes in dryland ecosystems. Keywords Caragana microphylla Phenology Photosynthesis Seasonal pattern Time lag