Pedosphere 15(4): 448--455, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Contribution of root respiration to total soil respiration in a Betula ermanii-dark coniferous forest ecotone of the Changbai Mountains, China
LIU Ying, HAN Shi-Jie, ZHOU Yu-Mei and ZHANG Jun-Hui
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). E-mail: huyingamy@163.com
ABSTRACT
      Total and root-severed soil respiration rates forfiveplots set up 50 m apart in a Betula ermanii Cham.-dark coniferous forest ecotone on a north-facing slope of the Changbai Mountains, China, were measured to evaluate the seasonal variations of soil respiration, to assess the effect of soil temperature and water content on soil respiration, and to estimate the relative contributions of root respiration to the total soil respiration. PVC cylinders in each of 5 forest types of a B. ermanii-dark coniferous forest ecotone of roots to the total soil were used to measure soil respirations both inside and outside of the cylinders. The contribution respiration rates ranged from 12.5% to 54.6%. The mean contribution of roots plots varied with the season, increasing from 32.5% on June 26 to 36.6% on August 3 and to 41.8% on October 14. In addition, there existed a signif cant (P <0.01) logarithmic relationship between total soil respiration rate and soil temperature at 5 cm soil depth.Also, a similar trend was observed for the soil respiration and soil water content at the surface (0-5 cm) during the same period of time.
Key Words:  Betula ermanii Cham., dark coniferous forest, ecotone, root respiration, soil respiration
Citation: Liu, Y., Han, S. J., Zhou, Y. M. and Zhang, J. H. 2005. Contribution of root respiration to total soil respiration in a Betula ermanii-dark coniferous forest ecotone of the Changbai Mountains, China. Pedosphere. 15(4): 448-455.
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