Direct and indirect effects of nitrogen additions on fine root decomposition in a subtropical bamboo forest

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• 作者：Li-hua Tu ; Yong Peng ; Gang Chen ; Hong-ling Hu ; Yin-long Xiao…
• 关键词：Nitrogen deposition ; Root decomposition ; Litter substrate ; Lignin ; Bamboo
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：389
• 期：1-2
• 页码：273-288
• 全文大小：676 KB
• 参考文献：1. Aber, JD, McDowell, W, Nadelhoffer, K, Magill, A, Berntson, G, Kamakea, M, McNulty, S, Currie, W, Rustad, L, Fernandez, I (1998) Nitrogen saturation in temperate forest ecosystems. Biosci 48: pp. 921-934 CrossRef
  2. Baron, JS, Hall, EK, Nolan, BT, Finlay, JC, Bernhardt, ES, Harrison, JA, Chan, F, Boyer, EW (2013) The interactive effects of excess reactive nitrogen and climate change on aquatic ecosystems and water resources of the United States. Biogeochemistry 114: pp. 71-92 CrossRef
  3. Berg, B (1986) Nutrient release from litter and humus in coniferous forest soils -a mini review. Scand J Forest Res 1: pp. 359-369 CrossRef
  4. Berg, B, Laskowski, R (2006) Litter decomposition: A guide to carbon and nutrient turnover. Elsevier Ltd., Burlington
  5. Berg, B, Matzner, E (1997) Effect of N deposition on decomposition of plant litter and soil organic matter in forest systems. Environ Rev 5: pp. 1-25 CrossRef
  6. Berg, B, McClaugherty, C (2008) Plant litter: Decomposition, humus formation, carbon sequestration. Springer, Heidelberg CrossRef
  7. Berg, B, Staaf, H (1980) Decomposition rate and chemical changes of scots pine needle litter II. Influence of chemical composition. Ecol Bull 32: pp. 373-390
  8. Birouste, M, Kazakou, E, Blanchard, A, Roumet, C (2011) Plant traits and decomposition: are the relationships for roots comparable to those for leaves?. Ann Bot.
  9. Bobbink, R, Hicks, K, Galloway, J, Spranger, T, Alkemade, R, Ashmore, M, Bustamante, M, Cinderby, S, Davidson, E, Dentener, F, Emmett, B, Erisman, J-M, Fenn, M, Gilliam, F, Nordin, A, Pardo, L, Vries, W (2010) Global assessment of nitrogen deposition on plant diversity : a synthesis. Ecol Appl 20: pp. 30-59 CrossRef
  10. Boddy, E, Hill, PW, Farrar, J, Jones, DL (2007) Fast turnover of low molecular weight components of the dissolved organic carbon pool of temperate grassland field soils. Soil Biol Biochem 39: pp. 827-835 CrossRef
  11. Bowden, RD, Davidson, E, Savage, K, Arabia, C, Steudler, P (2004) Chronic nitrogen additions reduce total soil respiration and microbial respiration in temperate forest soils at the Harvard Forest. Forest Ecol Manag 196: pp. 43-56 CrossRef
  12. Burton, AJ, Pregitzer, KS, Reuss, RW, Hendrick, RL, Allen, MF (2002) Root respiration in North American forests: effects of nitrogen concentration and temperature across biomes. Oecologia 131: pp. 559-568 CrossRef
  13. Cairns, MA, Brown, S, Helmer, EH, Baumgardner, GA (1997) Root biomass allocation in the world’s upland forests. Oecologia 111: pp. 1-11 CrossRef
  14. Carreiro, MM, Sinsabaugh, RL, Repert, DA, Parkhurst, DF (2000) Microbial enzyme shifts explain litter decay responses to simulated nitrogen deposition. Ecol 81: pp. 2359-2365 CrossRef
  15. Chen, X, Zhang, X, Zhang, Y, Booth, T, He, X (2009) Changes of carbon stocks in bamboo stands in China during 100 years. Forest Ecol Manag 258: pp. 1489-1496 CrossRef
  16. Cleveland, CC, Townsend, AR (2006) Nutrient additions to a tropical rain forest drive substantial soil carbon dioxide losses to the atmosphere. Proc Natl Acad Sci U S A 103: pp. 10316-10321 CrossRef
  17. Cui, J, Zhou, J, Peng, Y, He, Y, Yang, H, Mao, J, Zhang, M, Wang, Y, Wang, S (2014) Atmospheric wet deposition of nitrogen and sulfur in the agroecosystem in developing and developed areas of Southeastern China. Atmosph Envrion 89: pp. 102-10
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Aims As an important contributor to carbon (C) flux in the global C cycle, fine root litter in forests has the potential to be affected by the elevated nitrogen (N) deposition observed globally. However, the direct effects (on current fine root decomposition) and indirect effects (on root quality and subsequent decomposition) of N deposition on fine root decomposition are poorly understood. Methods We conducted a 5-year field experiment in a Pleioblastus amarus bamboo forest in southwestern China. In the first 3?years of the experiment, N-treated sites (0, 50, 150, and 300?kg?N?ha??year?, respectively) and fine roots under two N regimes (0 and 150?kg?N?ha??year?; 0?N-Root/+N-Root, respectively) were prepared. Next, these two fine root treatments were applied to a 2-year decomposition experiment in the N-treated sites under continuous N treatment. Results Nitrogen additions increased fine root density, concentrations of N, P, and lignin in fine roots, and concentrations of TOC, TN, NH4 +-N and NO3 ?/sup>-N in the soil, and decreased the soil pH. The decomposition constant k decreased under N addition treatments, and the decomposition rate of + N-Root was lower than that of 0?N-Root, suggesting that both the direct and indirect effects of N additions on fine root decomposition rates were negative. Both N addition and root substrate changes led to an increase in the residual lignin content during decomposition. Nitrogen additions significantly decreased the loss of C, N, P, K, Ca and Mg during decomposition. Conclusions The changes in the soil environment and increased root lignin concentration as a result of N additions may be the mechanism underlying the negative direct and indirect effects observed. Elevated fine root biomass input and slower degradation rates may be a potential mechanism explaining the increase in soil TOC and TN under N treatment.